No built-in cylinder
Heats domestic water as it passes through. Hot-water flow depends on available power and the temperature rise, especially in winter.
Check: shower flow and incoming water temperature.
ELECTRIC HEATING. CLEARLY COMPARED.
The right boiler.
For your property.
Compare electric boilers by the differences that matter: hot water, electrical supply and installation space.
Published by ECBC, supplier of Elektra and Guival.
Manufacturer sources. No paid rankings.
THE FIRST QUESTION01 / 03
How does your home
use hot water?
ECBCHEATING + HOT WATER
Radiators & wet UFHShower & tapsBath & stored water
Start with the hot-water design.
Then check heat loss and electrical capacity.
25 model / setting records7 competing brands4 separate comparison groupsResearch reviewed 13 Oct 2026
FIND YOUR SHORTLIST
Compare the right category.
Choose a group, filter the models, then add up to three to compare side by side.
| Model | Output | Hot water | Source |
|---|---|---|---|
| Elektra EASY.C | 12 kW | No DHW cylinder | Manufacturer / product source |
| Guival Small.C | 12 kW | No DHW cylinder | Manufacturer / product source |
| Strom E-Boiler SBSP11C | 11 kW | No DHW cylinder | Manufacturer / product source |
| Strom E-Boiler SBSP15C | 14.4 kW | No DHW cylinder | Manufacturer / product source |
| Strom E-Boiler SBTP18C | 18 kW | No DHW cylinder | Manufacturer / product source |
| EHC Mercury Combi | 12 kW | No DHW cylinder | Manufacturer / product source |
| ECA Arceus Combi 12 | 12 kW | No DHW cylinder | Manufacturer / product source |
| Elektra EASY.BPC | 6 kW | Built-in cylinder; capacity to confirm for 6 kW variant | Manufacturer / product source |
| Elektra EASY.BPC | 8 kW | Built-in cylinder; capacity to confirm for 8 kW variant | Manufacturer / product source |
| Elektra EASY.BPC | 12 kW | 37.5 L DHW cylinder (product-page claim) | Manufacturer / product source |
| Guival Small.BPL | 12 kW | 30 L DHW cylinder | Manufacturer / product source |
| Trianco Aztec Maxi Combi | 12 kW | Internal storage; 41 L total water content in 2024 brochure, DHW-only capacity unverified | Manufacturer / product source |
| Elnur Mattira MAC15 · set to 12 kW | 12 kW | 50 L DHW cylinder | Manufacturer / product source |
| EHC Comet Combination Unit | 12 kW | 144 L on current range page; older listing 140 L. Confirm variant | Manufacturer / product source |
| Heatrae Sadia Electromax | 9 kW | 180 L DHW cylinder | Manufacturer / product source |
| Strom A.I.One · 11 kW range | 11 kW | 150 / 170 / 200 L range; exact pairing to confirm | Manufacturer / product source |
| Elektra SMART.N | 12 kW | External cylinder needed for stored DHW | Manufacturer / product source |
| Guival Small.N | 12 kW | External cylinder needed for stored DHW | Manufacturer / product source |
| Strom E-Boiler SBSP11S | 11 kW | External cylinder needed for stored DHW | Manufacturer / product source |
| Trianco Aztec System · 12 kW | 12 kW | External cylinder needed for stored DHW | Manufacturer / product source |
| Elnur Mattira MAS15 · set to 12 kW | 12 kW | External cylinder needed for stored DHW | Manufacturer / product source |
| ECA Arceus System 12 | 12 kW | External cylinder needed for stored DHW | Manufacturer / product source |
| Viessmann Vitotron 100 · 8 kW | 8 kW | External cylinder needed for stored DHW | Manufacturer / product source |
| Viessmann Vitotron 100 · 12 kW | 12 kW | External cylinder needed for stored DHW | Manufacturer / product source |
| Heatrae Sadia Amptec C1200 · flow boiler | 12 kW | External cylinder needed for stored DHW | Manufacturer / product source |
| Elektra SMART.N + unvented cylinder | 12 kW | Compatible indirect unvented cylinder; model and capacity to specify | Manufacturer / product source |
Outputs shown are the named model or configured setting, not a property recommendation. Prices are dated published listings, exclude installation and delivery, and are not live quotes. VAT basis is shown; no price ranking is applied.
YOUR SHORTLIST
Side by side.
Only models in the same comparison group can be shortlisted together. Different outputs, storage sizes and supply types still need checking.
BEYOND THE SPECIFICATIONS
What do the differences mean for your property?
Read our buying guide for ECBC starting points, fair competitor comparisons and the checks that could change your shortlist.
ONE OBJECTION AT A TIME
Three boiler designs. Compare packages separately.
Built-in hot-water storage
A cylinder provides stored hot water. Usable draw-off, recovery time and operating mode matter as much as the nominal litre capacity.
Check: bathing demand, recovery and cupboard space.
System or heating-only
Heats the wet heating circuit. Domestic hot water needs a separately specified cylinder or another hot-water solution. Flow boilers may need external components.
Check: cylinder, controls, pump and expansion vessel.
Electric boilers are not cheaper to run than gas. Choose on suitability and the practical needs of your property. This site does not estimate running costs.
FROM SHORTLIST TO CONFIDENCE
Get a boiler recommendation.
Tell ECBC about the property, heating and hot-water demand. We’ll help you decide which of our boilers to consider.
Before confirming any boiler, we check suitability so there are no surprises later.
Installation support is available as an optional next step.
Discuss my shortlist on WhatsApp ↗Call 020 8998 2024
For landlords and homeowners.
For installers: ECBC technical support ↗
READ THE EVIDENCE
How this comparison is built.
A useful comparison should make its limits visible.
Selected for relevance
Strom, EHC, Trianco, Elnur, ECA, Viessmann and Heatrae Sadia have relevant UK product ranges or listings. Selection uses product relevance and visible market presence, not audited sales volumes. We have not established a “most sold” ranking.
Published facts, visible gaps
Each record links to its source. “Not verified” means we have not established that field; it does not mean a product lacks the feature. Manufacturer claims have not been independently performance-tested.
Fair comparisons
Boiler-and-unvented-cylinder packages are compared separately with SMART.N plus a specified cylinder. Compact BP-style combis retain their own group. Flow boilers are labelled as heating-only alternatives. Flow figures with different temperatures or test conditions are not treated as equivalent. Dimensions are casing sizes, not required installation clearances.
Data notes, ownership and update policy
ECBC owns this comparison and sells Elektra and Guival. ECBC entries carry an “ECBC range” label; there are no winner scores or sponsored placements. EASY.BPC and SMART.BPC are the same product under a rebranding, confirmed by ECBC on 13 October 2026. Specifications remain tied to the named power variant.
Sources were reviewed on 13 October 2026. Some linked brochures are older than the review date. Prices and terms may change; confirm current availability, accessories, warranty eligibility and exact model documents before purchase. EHC’s Comet capacity differs between current and older listings. Trianco Maxi total water content is not treated as confirmed potable DHW capacity.
For public use, review data at least quarterly and after product changes. No automatic updates or sales-volume verification are active. This initial owner-private version is excluded from search indexing. Selections stay in this browser; this site uses no analytics or lead-storage service.