Category: Blog

My Gas Boiler Is 30kW. How Can a 12kW Electric Combi Be Enough?

We hear it most weeks, and it’s a fair reaction. If you’re replacing a 28kW or 30kW gas combi, a boiler with less than half the rating looks like a downgrade.

It isn’t necessarily. A 12kW electric boiler is not a 30kW boiler in disguise. It reaches the same result by a different route, and most of that difference comes down to what happens when you turn the shower on.

The short answer

For a suitably sized 2 to 3 bedroom home, the Elektra Smart.BPC can do the job you’d normally hand to a 28-30kW gas combi. It does it by holding hot water in a cylinder and heating as you use it, not by producing 30kW. Whether it fits your home comes down to three things: heat loss, how you use hot water, and your mains flow and pressure.

In this article: The graph  |  Filling a bath  |  Two showers  |  Your mains  | Sizing

Same job, two routes

Both boilers get hot water to your shower. They get there differently.

 

Heating is separate. What your radiators need comes from your home’s heat loss, not from the rating of the old boiler.

Does my home need 30kW just to stay warm?

No, and the number on the old boiler tells you very little about it.

What a house needs for heating comes from its heat loss: how quickly warmth escapes through the walls, windows, roof, floor and ventilation on a cold day. A modern, well-insulated mid-terrace and a solid-walled Victorian detached can both have three bedrooms and need very different amounts of heat. Proper sizing starts with the property. Copying whatever is printed on the boiler you’re removing is how people end up with a 30kW boiler in a house that needs a fraction of that.

So why do gas combis carry such big numbers?

Hot water.

Open the shower on a gas combi and cold mains water goes in one side. A few seconds later it has to come out hot, while it’s still moving. There’s no cylinder and no reserve. Doing that at a decent flow takes a lot of power in a very short time, so a modest home can end up with a 28 or 30kW boiler. Much of that rating is there for the taps, not the radiators.

What does the Smart.BPC do differently?

It carries a 37.5-litre cylinder inside the boiler, kept at 60-65°C. When the shower goes on, hot water is already waiting, and the boiler keeps heating the incoming water while you use it. Nobody showers at 60°C, so a thermostatic mixer blends the stored water with cold. That’s why 37.5 litres of hot water turns into a good deal more litres of shower.

Will one shower drain the cylinder?

A typical shower running at around 9 litres per minute uses between 45 and 72 litres of mixed water over 5 to 8 minutes. But that doesn’t mean you need 45 to 72 litres of stored hot water. With the cylinder at around 60°C, incoming mains water at approximately 14°C, and the shower mixer set to a comfortable 38–40°C, only around 52–57% of the shower water needs to come from the hot supply.

As the graph shows, a 5-minute shower needs roughly 24–25 litres of hot water at 60°C, while an 8-minute shower requires around 38–41 litres. The Smart.BPC has a 37.5-litre cylinder, so the stored hot water alone represents considerably more usable shower water once mixed down to shower temperature.

In ECO mode, this stored volume is designed around a normal 5 to 8 minute shower. And importantly, the boiler doesn’t simply wait for the cylinder to empty.

In COMFORT mode, the system goes a step further, maintaining the hot-water store for on-demand delivery. That’s why describing the supply simply as “37.5 litres of hot water” can be misleading. What matters at the shower is the amount of mixed water at 38–40°C that the stored energy can provide, together with the boiler’s ability to keep heating as you use it.

So, to anwer the question, a normal shower will not necessarily drain the Smart.BPC cylinder.

The Smart.BPC stores 37.5 litres at 60°C, so a typical shower can use a significant proportion of the stored volume, but the boiler, when in COMFORT Mode is also heating water while the shower is running. This means the cylinder does not simply empty litre for litre as you shower.

In practice, a normal 5 to 8 minute shower is within the intended operating range. Longer showers, higher flow rates, or a hotter mixer setting will use the stored hot water faster.

ECBC Hot Water Graph: what it actually shows.

ECBC publishes a hot water output curve for the Smart.BPC. We’ve included the part that doesn’t flatter us.

  • Blue, 8 L/min. Starts near 63°C, drops after about two and a half minutes, settles near 37°C by 30 minutes.
  • Red, 10 L/min. Same shape, falls sooner, ends nearer 32°C.
  • Green. ECBC’s curve for a good-quality thermostatic mixer valve.

That’s the honest picture. The store buys you the first few minutes at high temperature. After that the element does the work, and 12kW is a fixed amount of heat. Push more litres per minute through it and each litre gets less. Physics, not a design flaw, and it’s the reason the flow rate matters more than the kW figure.

Worth noticing what the table implies. A shower rarely runs on 8 litres per minute of hot water. The mixer adds cold, so the hot draw is smaller, and a smaller hot draw means a hotter result from the same 12kW. That’s why a good thermostatic mixer keeps getting recommended.

Can it fill a bath?

A bath is the harsh test, because you’re asking for a lot of hot water in a short time. The traditional sizing example, from BS 6700 (since withdrawn and replaced by BS EN 806 and BS 8558), is a standard 1700 x 700mm bath: about 100 litres at 40°C, made up of roughly 60% hot water and 40% cold.

For bath filling, the Smart.BPC is set to 8 litres per minute. Slowing the flow looks odd until you remember the trade-off from the graph. Less flow gives the boiler more time to put heat into each litre, so the water arrives hotter. What matters is how quickly you get the amount of water you need at the temperature you need, and litres per minute is only half of that.

Heating 100 litres from 14°C to 40°C takes about 3kWh. Reading the 8 litre curve, the boiler has delivered that much heat after about nine minutes.

Not sure your home fits?

Send us your mains flow reading (test below) and a photo of your consumer unit, and we’ll tell you whether 12kW works for you.

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What if two people want a shower at the same time?

With 2 bar of cold mains pressure at the boiler, two thermostatic showers can run at once, each drawing around 4 litres per minute of hot water. Once the mixers add cold, each shower’s flow rises to 6 to 8 litres per minute. This is the point where a good thermostatic mixer stops being a nice extra and becomes part of the specification.

Could my mains supply matter more than the boiler?

Often, yes. This is the one people miss.

Imagine a gas combi that can heat enough water for 12 litres per minute under the right conditions. Now measure what’s actually arriving at your house, and it’s 9 litres per minute. The boiler can’t invent the missing 3. A bigger boiler only helps if there’s water to heat.

The bucket test

The bucket test. Time how long the kitchen cold tap takes to fill a 10-litre bucket, with nothing else running.

Time how long the kitchen cold tap takes to fill a 10-litre bucket, with nothing else running. Divide 600 by the number of seconds and you have your flow in litres per minute. Fifty seconds means 12. Sixty-seven means about 9.

Pressure matters too. Cold mains at the Smart.BPC should not exceed 2 bar. Above that, a pressure-reducing valve set between 1.5 and 2.0 bar is recommended, and/or a 2-litre potable expansion vessel. These are installation details, and they decide whether you get the performance you were shown.

Does every 2-3 bedroom home need a 12kW boiler?

No, and we’d be wary of any sizing guide built on bedroom count alone. Three things change the answer:

  1. Heat loss. A three-bed Victorian detached and a three-bed modern terrace are different problems.
  2. Hot-water habits and bathrooms. One shower each morning is a different demand from consecutive showers plus a bath in the evening.
  3. Mains flow and pressure. See the bucket test above.

Then there’s the electrical supply. At full power, 12kW is roughly 52A at 230V. The element starts at about 2kW and ramps up, but the supply still has to be checked before anyone orders anything. Sometimes 12kW is right. Sometimes it isn’t. Size the boiler to the home, not to the number on the one you’re taking out.

 

Let us help you choose the right boiler. call us at 02089982024, WhatsApp us at +447888677250 or email us at contact@ecbc.uk

 

Performance figures are based on ECBC test data for the Elektra Smart.BPC with 14°C incoming cold mains. Colder mains, lower pressure or higher flow rates reduce delivered temperature. The bath example uses the traditional sizing figure of 100 litres at 40°C from BS 6700, which has since been withdrawn.

Oil Boiler vs Electric Boiler in the UK (2026): Should You Make the Switch?

For many UK homes—especially those off the gas grid—oil boilers have been the default heating solution for decades. But with rising oil prices, increasing maintenance demands, and a shift toward electrification, more homeowners are now reconsidering their options.

So, is it time to replace your oil boiler with an electric one?

Let’s break it down clearly.

1. The Current Reality of Oil Heating in the UK

Oil boilers are still used in around 1.5–1.7 million UK homes, mostly in rural areas. However, the landscape has changed significantly in recent years.

Key factors affecting oil users today:

  • Highly volatile pricing
    Heating oil is currently around £1.20–£1.30 per litre in many areas
    Prices can change daily because they’re tied to global oil markets.
  • No price protection
    Unlike gas and electricity, oil is not covered by the Ofgem price cap, meaning households are fully exposed to market spikes
  • Rising costs in 2026
    Oil prices have surged 30%+ year-on-year, with recent spikes linked to geopolitical events
  • Typical annual cost
    Most homes spend around £600–£1,200/year, but larger homes can easily exceed this
  • Bulk buying required
    You must purchase oil in large quantities upfront (often £500–£1,000 per fill)

2. Electricity Costs (Context for Comparison)

Electricity is often seen as more expensive—but it’s more stable:

  • Average electricity price: ~24–27p per kWh (2026 cap)
  • Protected by the Ofgem price cap
  • No need for bulk purchases
  • Increasing integration with solar and battery systems

3. Oil Boiler vs Electric Boiler (Side-by-Side)

Factor Oil Boiler Electric Boiler (e.g. ECBC ELEKTRA / GUIVAL)
Fuel cost stability ❌ Highly volatile ✅ Regulated (price cap)
Upfront fuel purchase ❌ Yes (bulk oil tank) ✅ No
Efficiency ~85–90% ~99% at point of use
Maintenance ❌ Annual servicing + tank ✅ Minimal servicing
Installation complexity ❌ Flue, tank, fuel lines ✅ Compact, simple
Carbon emissions ❌ High ✅ Zero at point of use
Noise ❌ Audible burner ✅ Silent
Space required ❌ Tank + boiler ✅ Wall-mounted only
Compatibility with solar ❌ Limited ✅ Excellent
EPC impact Moderate Depends on system (improves with renewables)

4. Pros of Replacing an Oil Boiler with an Electric Boiler

1. Simpler, cleaner installation

Electric boilers (like ECBC’s ELEKTRA SMART or GUIVAL range) are:

  • Compact
  • Wall-mounted
  • No flue, no tank, no fuel storage

This makes them ideal for:

    • Flats
    • Renovations
    • Holiday lets
    • Properties where space matters

✅ 2. Much lower maintenance

Oil systems require:

  • Annual servicing
  • Tank inspections
  • Burner cleaning
  • Fuel quality checks

Electric boilers:

  • No combustion
  • Fewer moving parts
  • Significantly fewer failure points

✅ 3. Stable and predictable costs

Oil:

  • Prices change daily
  • No cap
  • Influenced by global events

Electric:

  • Price cap protection
  • More predictable monthly costs
  • Can be optimised with tariffs (e.g. off-peak)

✅ 4. Cleaner and future-proof

Electric boilers:

  • No on-site emissions
  • Align with UK decarbonisation targets
  • Work seamlessly with:
    • Solar PV
    • Battery systems (e.g. BOLT concept)

✅ 5. No fuel storage risks

Oil tanks can:

  • Leak
  • Require space
  • Need replacement
  • Pose environmental risks

Electric systems eliminate this entirely.

5. Cons of Switching to an Electric Boiler

❌ 1. Higher unit cost of electricity

Electricity is still more expensive per kWh:

  • Oil: ~8–10p/kWh
  • Electricity: ~24–27p/kWh

👉 This is the main drawback

❌ 2. Electrical capacity requirements

Electric boilers (like 12kW systems):

  • Require sufficient mains capacity (typically 60–100A supply)
  • May need consumer unit upgrades

❌ 3. Running cost depends on usage

Electric boilers work best when:

  • Property is well insulated
  • Heat demand is controlled
  • Smart usage or storage (e.g. batteries) is used

6. Where Electric Boilers Make More Sense

Switching from oil to electric is particularly strong in:

✔ Flats and apartments

  • No space for oil tanks
  • Lower heat demand

✔ Holiday lets / Airbnb properties

  • Cleaner, safer, no fuel logistics
  • Less maintenance between guests

✔ Modern or renovated homes

  • Better insulation = lower running costs

✔ Properties with solar or batteries

  • Electricity becomes significantly cheaper

7. Where Oil May Still Be Competitive

Oil boilers can still make sense if:

  • You have a large, poorly insulated property
  • You rely on very high heat demand
  • You cannot upgrade electrical supply
  • You bulk-buy oil strategically at low prices

8. Final Verdict: Is It Worth Switching?

Short answer:

  • Yes — for simplicity, safety, and future-proofing
  • It depends — for pure running cost alone

Why Are Gas Boilers “A-Rated” While Electric Boilers Get a “D”?

If you’ve looked at an Energy Performance Certificate (EPC) recently, you might have noticed something odd. A gas boiler that burns fossil fuels and produces carbon monoxide can be stamped with an A. An electric boiler, almost 100% efficient at the outlet, producing no emissions in your home, often gets marked as a D. Confused? You’re not alone.

The EPC puzzle

EPCs were designed to provide homebuyers and landlords with a quick and easy way to compare properties. One letter, A to G, to show how “efficient” a home is. The idea is simple. The reality is more complicated.
Here’s the catch: EPCs aren’t really measuring what happens in your home. They’re based on models that use fuel price assumptions and grid factors.
Gas is cheaper per unit of energy, so homes with gas boilers tend to score better. Electricity costs more per unit, so homes with electric heating get marked down – even though the system is nearly 100% efficient in the home.
That’s how you can spend thousands on insulation, glazing, solar panels or a new heating system, and still see your EPC score drop.

Why it matters

EPCs are more than just a piece of paper. They:
– Influence the value of your home.
– Decide if a landlord can rent out a property.
– Affect eligibility for green funding or mortgage products.

When the score doesn’t reflect reality, it can mislead both homeowners and installers.

The government’s own consultation admits the obvious: EPCs can’t keep using fuel costs as the headline. Price assumptions don’t align with emissions, and they swing around with the market. That’s why a gas boiler burning fossil fuels can look like an “A” while an electric boiler, 99% efficient at the outlet, gets a “D”.

The fix on the table is a new heating system metric. It would score the technology itself — not just what today’s tariffs happen to say. Gas at the bottom, efficient electric and low-carbon tech at the top.
That matters, because changing a heating system is expensive and disruptive. People need clear, consistent guidance. Not a certificate that shifts when wholesale prices move.

Reform is on the way, we hope.

The government has recognised the problem. In a consultation on EPC reform, it admitted that the current approach — a single letter based heavily on fuel prices — doesn’t support the transition to clean heat.

The plan from 2026 is to replace that single score with four headline metrics:

– Fabric performance: how well your home holds heat.
– Heating system: what technology you use, and how efficient/clean it is.
– Smart readiness: how well your home works with batteries, EVs, and flexible tariffs.
– Energy cost: what it’s likely to cost to run.

That’s progress. But until those changes arrive, EPCs will continue to make electric heating look worse than it really is.

The logical fix

For EPCs to be truly useful, they should measure three things side by side:
– Cost (what you’ll pay).
– Carbon (your emissions footprint).
– Consumption (what the home actually uses at the socket).

That way, consumers and installers can make decisions based on facts, not flawed assumptions.

What this means for you

– Homeowners: Don’t panic if your electric boiler or heat pump looks under-rated on your EPC. The system is outdated, not your choice of heating. Look instead at your actual bills, comfort, and emissions.

– Installers: This is a chance to educate customers. Point out that electric systems are efficient in the home, and that EPC reform is coming to reflect that. Customers need reassurance that they haven’t made a “bad” choice just because the paperwork says D.

Gas boilers may carry an “A” sticker today, but that doesn’t make them cleaner or smarter. Electric boilers and heat pumps deliver near 100% efficiency or more in the home and produce no emissions at the point of use.

EPC reform is on the horizon. Until then, remember: the letter on your certificate isn’t the whole story.

Over a Decade of Warmth: 10+ Years of Happy Customers with the UK’s First Electric Combi Boilers

More than ten years ago, we had a radical idea:
What if the UK could heat its homes without gas—reliably, efficiently, and instantly?
No cylinders, no tanks. Just one wall-hung electric combi boiler that could do it all: deliver central heating and hot water on demand.

Fast forward to today, and that idea isn’t just a reality—it’s become the heating solution of choice for thousands of homes, installers, and property managers across the UK. And we’re still just getting started.

The First of Its Kind in the UK

Back in 2013, Electric Combi Boilers Company introduced the first wall-hung 12kW electric combi boiler to the UK market. Until then, electric heating options were clunky, slow, or limited to point-of-use systems. Our mission was to design something different—something future-proof.

We partnered with leading Italian manufacturers and developed a range of electric boilers built specifically for the UK electrical infrastructure, housing stock, and customer expectations.

Not only did we bring the first true electric combi boiler to the market—we’ve continued to refine, upgrade, and expand our offering ever since.

✅ First UK-designed wall-hung electric combi
✅ Instant hot water—no preheating, no cylinder
✅ Designed for 80A–100A fuses (no DNO upgrades required)
✅ Available from just 12kW—perfect for flats, studios, small homes, and low-energy builds

10+ Years of Happy Customers

Over the past decade, our boilers have been installed in:

  • City flats in London
  • Off-grid homes in Cornwall
  • New-build apartments in Manchester
  • Refurbished cottages in Scotland

We’ve served thousands of customers ranging from first-time buyers to commercial landlords—and a huge number of them have become repeat customers, recommending us to family, tenants, and fellow installers.

Don’t just take our word for it. Our Trustpilot and Google reviews speak volumes about what it means to have direct access to a dedicated UK support team, a reliable product, and fast after-sales service.

We don’t hide behind call centres—we solve problems.

“The support has been amazing. A real person helped me configure the boiler over the phone. Can’t fault them.”
— Actual customer feedback, Trustpilot

Why Electric? Why Now?

The last few years have put electric heating on the map. With new builds going electric, heat pumps gaining popularity, and gas boilers on their way out, customers are now asking the questions we’ve been answering since 2013:

  • Can I go gas-free without compromising on comfort?
  • Will an electric boiler really heat my home efficiently?
  • What about hot water—will it be instant?

Yes, yes, and yes. With a 99% efficiency at the point of use and no flue, no gas, and no cylinder, electric combi boilers are increasingly seen as a clean, convenient alternative—especially in well-insulated homes.

We’re proud to have led the market, not followed it.

Trusted by Installers, Loved by Customers

Our electric combi boilers are trusted by hundreds of registered installers across the UK. Whether it’s a straightforward replacement or a full electric-first retrofit, we provide all the guidance and support needed—from fuse checks to flow rate advice and wiring diagrams.

And with up to 10 years warranty available on our ELEKTRA SMART range (5 years standard on GUIVAL), we back up our claims with commitment.

A Quiet Revolution—One Boiler at a Time

It’s easy to overlook the little things that make a big difference: a warm flat on a cold morning, a hot shower that doesn’t require waiting, the peace of mind that your heating is safe, clean, and future-proof.

That’s what we’ve delivered for over a decade—and will continue to do for decades to come.

🔗 Learn more about our boilers: www.electriccombiboilerscompany.com
🔧 Interested in installation? Our in-house team can guide you.
🛠️ Are you a trade professional? Join the growing network of UK installers working with us.

👋 Ready to go gas-free—without the drama?

Let’s talk. We’re not here to sell you a boiler. We’re here to help you find a smarter solution.

Cutting Costs: Smart Ways to Reduce Energy Consumption with Your Electric Combi Boiler

Let’s explore some strategies to help reduce energy consumption with your Elektra Compact boiler:


Adjust Boiler Flow Temperature: Lowering the boiler’s flow temperature can enhance efficiency. Setting it to around 60°C can reduce energy usage while maintaining comfort. This adjustment can often be made via the boiler’s control panel. 


Utilize Eco Mode: The Elektra Compact boiler offers an “Eco” mode designed to optimize energy consumption. Switching from “Comfort” to “Eco” mode can prevent the boiler from maintaining constant high temperatures, thereby saving energy. Ensure you’re familiar with toggling between these modes; if you need guidance, refer to the user manual or instructional videos. 


Optimize Thermostat Placement and Settings: Ensure the thermostat is located in a frequently used room, away from drafts, direct sunlight, or heat sources, to provide accurate temperature readings. Maintaining a consistent temperature between 18-21°C can help manage energy consumption effectively. 


Implement Zonal Heating: If possible, heat only the rooms that are in use. This targeted approach can significantly reduce unnecessary energy expenditure.


Regular Maintenance: Bleeding radiators to eliminate trapped air ensures efficient heating. Additionally, scheduling annual boiler services can identify and rectify issues that may cause excessive energy use. 


Enhance Home Insulation: Proper insulation in walls, lofts, and floors helps retain heat, reducing the workload on your boiler. Simple measures like draught-proofing doors and windows can also make a noticeable difference.
In addition to optimizing the boiler settings and heating habits, I recommend checking and possibly switching to a more cost-effective electricity tariff. Here’s what they can do:


Compare Energy Tariffs – Use comparison sites like Uswitch, Compare the Market, or MoneySuperMarket to find the best deals. Some suppliers offer off-peak tariffs that could reduce costs if they can shift some usage to cheaper hours.


Consider Economy 7 or Economy 10 – If their energy usage aligns with off-peak hours, Economy 7 or Economy 10 tariffs may offer lower rates during certain times of the day. However, they should check if their current meter supports these tariffs.


Contact the Energy Supplier – Sometimes, just calling their supplier and asking for a better deal can result in lower costs. Suppliers might offer fixed-rate plans or time-of-use tariffs that better suit their consumption patterns.

What Maintenance Does an Electric Boiler Require for Longevity?

Nothing quite matches the warmth and comfort generated by an electric boiler. But for that labor to pay off requires a little pampering to keep it working soundly for a while. Here are some very simple, obvious electric boiler maintenance tips to get ACTUAL long life.

Understanding Your Electric Boiler

First of all, it’s good to read what you’re working with. With electric boilers, there are no complicated combustion processes like gas boilers so less can go wrong, but they still need attention. They operate by heating water with electric components, and although they tend to be fairly simple in design, monitoring them is the real secret to preventing expensive repairs or sudden malfunctions.

Regular Checks Are Your Best Friend

  1. Inspect the Pressure:

    There is a pressure gauge on your boiler. Look it up regularly to ensure that it sits in the normal range, which is generally between 1 and 1.5 bar when cold. If it’s too low, you should add system water. If it is too high, you might have a problem, such as a leaking pressure relief valve.

  2. Look for Leaks:

    It sneaks up quietly. Watch for humidity around your electric boiler or water spots on your wall or floor. If you do manage to find a spot, that’s when you should call a professional, because even a single droplet can cause consequential damage.

  3. Test the Anode Rod:

    The more common electric boiler with a storage tank does benefit from an anode rod; it sacrifices itself to prevent the tank from rusting. This needs to be checked every year and changed when corroded; a bit like the bodyguard of your boiler, you want it strong enough to protect itself.

Keep It Clean, Keep It Running

  1. Clean or Replace the Filter

    Much like a living organism, if your boiler has a filter (and many do), it’s the lungs of your system. A soiled filter means less effective heating, so clean or replace it as the manufacturer suggests. It could even mean every few months or once a year.

  2. Descale Your System:

    Hard water areas beware! Water build-up within your electric boiler can cause lime scale, which affects your efficiency and damages elements. Descaling is not something you do on a daily basis, however, performing this every few years or as needed can help keep your boiler in tip-top shape.

  3. Dust and Dirt Be Gone:

    Even though electric boilers do not possess the fans as gas-powered boilers but the dust and dirt could still settle on the electrical elements. To avoid overheating, have the brush or cleaning cloth as far from the work environment as possible.

Electrical Health

  1. Electrical Connections:

    Wires or loose connections could ignite or allow your boiler to fail. If you are not bravado enough to check these yourself, as they can be hazardous, you should get an electrician to do an annual inspection.

  2. Test the Safety Devices:

    Your boiler has safety cut-outs or switches that must switch off the power if something is wrong. Test these to make sure they are working if you have no idea how, there should be instructions in the manual, or get a professional.

Don’t Neglect the Out There

  1. External Inspection:

    Take a look at the outside of your electric boiler for any wear and tear. This should include checking the casing for signs of rust or damage that will leave internal components exposed to the elements.

  2. Ventilation:

    Gas boilers require flues, but electric boilers do not, although they can create heat and good air circulation is important. Ensure there is adequate spacing surrounding your boiler, allowing free flow of air.

When to Call the Pros

These maintenance tasks may appear relatively easy, yet some tasks are best left to the professionals:

  • Annual Service: Even if you do all of your basic maintenance correctly, having a professional service the boiler once annually can catch things you would never notice. It’s like an annual health checkup of your boiler.
  • Weird Noises: If your boiler begins to make weird noises, something’s up. Don’t wait until it’s a problem.
  • Declines in Performance: If your heating isn’t as effective, or your bills suddenly jump, a pro can help figure out why.

The Long Game

Servicing is not only about being able to fix a problem but also about finding a way around issues before they happen. Here’s why:

  • Longevity: Getting your boiler serviced regularly increases the lifespan of the appliance tremendously.
  • Save: A well-maintained boiler will use propane more efficiently and will save you more money on your energy bills.
  • Safety: Everything is checked out, and your home is safe from potential hazards such as electrical faults or leaks.


Your electric boiler turns into your old companion who is there to warm you but needs some care now and then in the long run. Following these steps not only protects a machine but also makes sure the house stays cozy home over the years to come. So take a bit of time out to do this and make sure that your boiler is going to be in great condition afterward.

Are electric boilers better than storage heaters?

Electric Boilers vs Storage Heaters: Which One is Right for You?

When considering electric heating solutions for your home, two common options stand out: electric boilers and storage heaters. Each has its strengths and weaknesses, but if you’re looking for efficiency, convenience, and long-term cost-effectiveness, there are some critical factors to consider. In this blog, we’ll compare the two heating systems in terms of efficiency, cost, installation, maintenance, and servicing to help you make an informed decision.

1. Efficiency

Electric Boilers

Electric boilers are highly efficient as they convert nearly 100% of electricity into usable heat. They work by heating water, which then circulates through radiators or underfloor heating systems, providing a consistent and even heat distribution across your home. The biggest advantage of an electric boiler is that it heats all radiators in the house simultaneously, unlike storage heaters, which operate individually.

Storage Heaters

Storage heaters, on the other hand, rely on charging up during off-peak hours (typically at night) and releasing heat throughout the day. While this may seem energy-efficient in theory, it has a major drawback: the heat is released whether you need it or not. If the stored heat is depleted too early in the day, you may be left without warmth when you need it most, unless you switch to expensive on-peak electricity to recharge the heater.

Verdict: Electric boilers provide on-demand heating, making them more reliable and adaptable to your heating needs.

2. Running Costs

Electric Boilers

A key benefit of an electric boiler is that it only heats water when required, reducing wasted energy. Unlike storage heaters, which must be charged overnight regardless of actual usage, electric boilers operate efficiently by responding to your specific heating demands.

Additionally, since an electric boiler powers multiple radiators simultaneously, the overall energy consumption is often lower compared to having several individual storage heaters running throughout the house.

Storage Heaters

While storage heaters benefit from off-peak electricity rates, they can still be costly in the long run because they cannot adapt to fluctuating heating needs. Any excess heat not used during the day is wasted, and if extra heating is needed in the evening, on-peak electricity must be used, which is significantly more expensive than running an electric boiler.

Verdict: Electric boilers tend to have lower running costs because they only use electricity when heat is needed, unlike storage heaters, which consume electricity regardless of usage.

3. Installation

Electric Boilers

Installing an electric boiler is relatively straightforward. It typically requires a single compact unit to be connected to the existing radiator system or underfloor heating. There’s no need for large water tanks or additional storage, making it a space-saving solution.

Storage Heaters

Storage heaters require multiple units to be installed in different rooms, each needing its own dedicated power connection. This makes installation more time-consuming and space-intensive compared to a single electric boiler unit.

Verdict: Electric boilers win in terms of ease of installation, taking up less space and requiring only one unit compared to multiple storage heaters.

4. Maintenance and Servicing

Electric Boilers

Electric boilers are low-maintenance as they have fewer moving parts than gas or oil boilers. However, to maintain warranty and efficiency, it is recommended to have them serviced every one to two years by a qualified technician.

Storage Heaters

Storage heaters require minimal servicing, but if individual units fail, they must be repaired or replaced separately, which can be inconvenient and costly over time.

Verdict: Both require minimal maintenance, but servicing an electric boiler is more straightforward compared to managing multiple storage heaters.

Final Verdict: Which One Should You Choose?

FeatureElectric BoilerStorage Heater
Efficiency✅ High (instant heating)❌ Lower (heat loss possible)
Running Cost✅ Generally cheaper❌ Higher due to heat loss & on-peak use
Installation✅ Easier (one unit)❌ Requires multiple units
Maintenance✅ Low, serviced every 1-2 years❌ Repairs can be complex

Why Choose an Electric Boiler Over a Storage Heater?

✅ Instant heating – No waiting for heat to be released. ✅ More control – Heats when you need it, rather than predetermined times. ✅ Lower running costs – Uses energy only when required. ✅ Space-saving – One compact unit vs. multiple storage heaters. ✅ Even heat distribution – Warms all rooms efficiently.

While storage heaters may seem attractive due to off-peak electricity savings, the lack of flexibility and potential for wasted heat makes them less cost-effective compared to electric boilers. If you want reliable, efficient, and cost-effective heating, an electric boiler is the better choice.

The Importance of Proper Pipe Sizing in the Electric Boilers

Pipe sizing is fundamental, even though most people are extremely careful about it to allow electric boilers to work satisfactorily and reliably. Accurate sizing allows appropriate water flow and subsequent heat transfer so that the system works as effectively as it should. Below are the importance of accurate piping sizing and its role in electrical boiler systems that we will discuss further.

Understand the Fundamentals of Pipe Sizing

Pipework sizing is a very vital engineering activity that enables the determination of the correct size of the pipes to enhance water transport flow in a boiler system. This can improve flow, heat transfer, and system efficiency. Flow rate, pressure drop, and fluid velocity are some factors that determine the pipe size. Taking all these factors into consideration allows the engineers to design a piping system that maximises efficiency and minimises energy consumption.

Why Proper Pipe Sizing is Important

Proper pipe sizing is an important factor for electric boilers to operate effectively and reliably. It is a factor that affects performance, energy consumption, and overall lifespan. Let us discuss the importance of proper pipe sizing in detail.

Efficient Heat Transfer

The flow of the water into the heating elements is adequately done if there are well sized pipes, maximizing heat transfer, therefore reducing energy consumption. With undersized pipes, however, friction and pressure drop increase, elevating energy consumption and reducing the effectiveness of the system.

Pump Load is Reduced

Properly sized pipes decrease pressure drop across the system. The load on the circulation pump is reduced, thus saving energy with an increase in the lifespan of the pump. Reduced pump load also reduces maintenance costs due to pump failures.

Increased System Reliability

Proper pipe sizing also prevents cavitation. Cavitation occurs when the pressure within the fluid is low. Cavitation is dangerous and causes damage to the pipes as well as pumps. Further, it minimizes pressure to system components thus making it last longer.

Improved Comfort of the User

Correct sizing of pipes also ensures proper water temperature throughout the system, which offers maximum comfort to users. An efficient flow of water also allows a quick response to heating. This reduces the waiting time for hot water.

Properly sized pipes will maximize system performance, minimize energy use, and promote comfort in the home. It is crucial to have a qualified HVAC professional design and install your electric boiler system correctly for your specific needs and long, trouble-free service.

Factors That Affect Pipe Sizing

There are several factors that determine the correct pipe size for an electric boiler. These include:

Flow Rate

The volume of water flowing through the system forms one of the most important determinants of pipe size. Higher flow rates require larger pipes so that there is an adequate water velocity.

Pressure Drop

This is pressure loss across the system and depends both on friction and fittings. Higher pressure drops require larger pipes so as to control flow resistance and maintain adequate pressure.

Fluid Velocity

Too high fluid velocity creates noise, vibration, and erosion on the interior of the pipes. Again, low velocity will form sedimentation, and hence, heat transfer will not work efficiently. Thus, fluid velocity should be optimum.

Material

The material of the pipes, whether copper or PEX, determines their thermal conductivity and pressure rating. Copper, for instance, has excellent thermal conductivity, whereas PEX offers flexibility and durability.

Professional Pipe Sizing

There’s only one “just right” size for any application. If the size is a little too large, you will start facing a whole host of problems, efficiency-wise and performance-wise. So, let us dive a little deeper into what happens when you oversize and undersize steam pipelines.

What Will Happen if the Pipe is Oversized?

Cost:A higher pipe size (100 NB instead of 80 NB) uses more material in the pipe itself and installation and insulation.

Energy Loss:The increased surface area of an oversized pipe translates to higher losses from convection and radiation. Wasted energy in this context means producing extra steam that will counter this loss. This also translates to increasing the cost of the produced steam.

Poor Performance Operation:In general, for the same flow rate, oversized pipes would result in a low-pressure drop that could translate into an inefficient use of steam at the point of utilisation.

What Will Happen if the Pipe is Undersized?

Pressure Drop Problems: The pressure drop of under-sized pipes is greater at the same steam flowrate compared to a correctly sized pipe. In other words, the pressure at the user end may be more or less, which has implications for his process, possibly affecting his product as well.

Flow Rate Famine: Because of lower capacity, undersized piping cannot deliver the required amount of steam at the needed flow rate. This “steam starvation” disrupts production schedules and can have a negative impact on product quality.

Water Hammer Risk: Because the flow area is restricted, the velocity of steam in an undersized pipe is much more than normal. This velocity creates a phenomenon known as a water hammer that can create damage through pressure surges and pipe erosion, hence equipment failure.

Conclusion

Proper pipe sizing will play a vital role in the electric boiler system design and installation process. Proper pipe sizing can optimise system performance, minimise energy consumption, and improve comfort for users. A qualified HVAC professional can recommend the proper design and installation of the electric boiler system to cater for your specific requirements with long-lasting and reliable service.