The Baxi MainEco Compact System 15 is a cupboard-fit natural gas system boiler with a 15kW output, built for homes with more than one bathroom where hot water comes from a cylinder. Front access to every component, a central top flue and a pipes-behind facility inside the 700 × 390 × 285mm casing keep installation and servicing straightforward, at a 28kg lift weight.
Main is now Main by Baxi. Same boiler, same sales code (7714605), now sold under the Baxi brand.
15kW system boilerErP A-ratedNOx class 6Cupboard fitFront access5-year warranty
49 dB(A)
Sound power level
5 years
Parts & labour warranty*
Applications & suitability
Where it goes
A small to medium home on mains gas with more than one bathroom, feeding a hot water cylinder on a sealed system.
Typical job
Replacing a tired system boiler on an existing cylinder set-up — pump and expansion vessel are built in, so there is less to hang on the wall.
Works with / replaces
Runs unvented or vented hot water cylinders and accepts the Baxi Multifit pre-plumb jig; the pipes-behind facility helps on swaps where pipework rises behind the boiler.
When not to choose this
No cylinder, no hot water — this boiler does not produce hot water on its own. A one-bathroom flat with no room for a cylinder is better served by the MainEco Compact Combi.
Key specifications
| Identity |
| Brand |
Baxi |
| Model |
MainEco Compact System 15 |
| Boiler type |
System |
| Fuel |
Natural gas |
| Performance |
| Output (central heating) |
15 kW |
| Seasonal space heating energy efficiency |
93% |
| NOx class |
6 |
| Sound power level |
49 dB(A) |
| Physical |
| Dimensions (H × W × D) |
700 × 390 × 285 mm |
| Weight |
28 kg |
| Flue type |
Concentric 60/100 mm |
| Hydraulic & electrical |
| Integral expansion vessel |
7 litres |
| Electrical supply |
230 V / 50 Hz |
| Warranty |
5 years (registration required) |
Installation & compatibility
This is a gas appliance: installation, commissioning and servicing must be carried out by a Gas Safe registered engineer. A hot water cylinder and system controls are required and are not supplied. *The 5-year parts and labour warranty applies subject to registration with Baxi after installation.
Related products
Baxi MainEco Compact System 18
The 18kW output for larger homes with higher heat loss.
View 18kW System
Baxi MainEco Compact 25kW Combi
One-bathroom homes without space for a cylinder.
View 25kW Combi
Ideal for
Multi-bathroom homes on a cylinder system that want a quiet, serviceable boiler in a kitchen cupboard, and installers who value front access on every component. Next-day delivery nationwide or click & collect from our Reading trade counter.
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