The Baxi MainEco Compact Heat 24 is a wall-mounted natural gas heat only boiler with a 24kW output, built as a straight replacement for old, standard-efficiency boilers on systems with a separate hot water cylinder. At 17.4kg installer lift weight in a 625 × 370 × 270mm casing, it hangs on an easy-fit bracket with front and side access for servicing.
Main is now Main by Baxi. Same boiler, same sales code (7712028), now sold under the Baxi brand.
24kW heat onlyErP A-ratedNOx class 617.4kg lift weightCupboard fit5-year warranty
17.4 kg
Installer lift weight
Applications & suitability
Where it goes
A medium to larger home on mains gas with an existing hot water cylinder and heating controls — kitchen cupboard or airing cupboard fit.
Typical job
A like-for-like swap of an old, standard-efficiency heat only boiler on a bigger radiator circuit, keeping the cylinder, tanks and controls in place.
Works with / replaces
Runs alongside your existing hot water cylinder and external heating controls; the telescopic 60/100mm flue (315–500mm) covers most standard wall depths without cutting.
When not to choose this
It only does heating — you need a separate cylinder and external controls already on the system. For instant hot water from one unit, or a sealed system with the pump built in, choose the MainEco Compact Combi or System instead.
Key specifications
| Identity |
| Brand |
Baxi |
| Model |
MainEco Compact Heat 24 |
| Boiler type |
Heat only |
| Fuel |
Natural gas |
| Performance |
| Output (central heating) |
24 kW |
| ErP efficiency class |
A |
| NOx class |
6 |
| Sound power level |
37 dB(A) |
| User adjustable CH temperature |
30–80 °C |
| Physical |
| Dimensions (H × W × D) |
625 × 370 × 270 mm |
| Weight |
17.4 kg |
| Flue type |
Telescopic concentric 60/100 mm (315–500 mm) |
| Electrical |
| 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. It requires an existing hot water cylinder and external heating controls, which are not supplied. *The 5-year warranty applies subject to registration with Baxi after installation.
Related products
Baxi MainEco Compact Heat 30
The 30kW output for the largest radiator circuits.
View 30kW Heat Only
Ideal for
Like-for-like heat only swaps in larger homes where the cylinder and controls stay put — light enough for a one-person hang. Next-day delivery nationwide or click & collect from our Reading trade counter.
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