Baxi
400 24kW Combi
A 24kW combi boiler from Baxi — installed in a single day by Gas Safe registered engineers.
Built for real homes.
Not showrooms.
The Baxi 400 24kW is designed to work quietly, efficiently, and reliably — for years to come.
- Compact, lightweight cupboard-fit design
- Stainless steel heat exchanger and brass hydraulics
- Pre-heated condensate trap to help prevent freezing
- External pressure gauge for easy top-ups
- Compatible with the Baxi uSense smart thermostat
- 24kW heat output — Combi boiler
- 20kW central heating output
- 10.2 L/min hot water flow rate
- 5 year manufacturer warranty
- 93% ErP efficiency rating
One price.
Everything covered.
No surprise add-ons. Your quote covers everything needed for a complete installation that meets all gas safety regulations, carried out by Gas Safe registered engineers.
Price and installation time varies depending on your installation requirements. Answer a few quick questions to get your exact fixed price.
Get your free quoteThe numbers
that matter.
Baxi 400 24kW
The Baxi 400 Combi 24kW is the entry point to Baxi's combi range: a compact, lightweight boiler that fits inside a standard kitchen cupboard. It heats water as you use it, with a hot water flow rate of up to 10.2 litres a minute.
Inside, it has a stainless steel heat exchanger and brass hydraulics. A pre-heated condensate trap helps prevent frozen condensate pipes in winter, and the external pressure gauge makes it easy to check and top up your system pressure. It works with the Baxi uSense smart thermostat.
Backed by a 5-year Baxi parts and labour warranty.
Don't let cost get
in the way of warmth.
Spread the cost of your new boiler over monthly payments that fit your budget. Available through Ideal4Finance, subject to status.
Learn about finance