The Baxi
800.
A 18kW system boiler from Baxi — installed in a single day by Gas Safe registered engineers.
Built for real homes.
Not showrooms.
The Baxi 800 18kW is designed to work quietly, efficiently, and reliably — for years to come.
- Compact Design
- Brass components
- 18kW heat output — System boiler
- 18kW central heating output
- 10 year manufacturer warranty
- 94% 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 800 18kW
The Baxi 800 System 2 is the top-tier system boiler in the Baxi range, designed for larger homes where consistent hot water to multiple bathrooms is the priority. With all heating components built in and a separate cylinder handling hot water storage, it delivers steady pressure and reliable performance throughout the home.
A built-in Adey MagnaClean Micro2 filter protects the system from day one, and brass hydraulics throughout add durability for the long term. Compatible with Baxi uSense smart controls, quiet in operation, and simple to service thanks to front-access design.
Backed by a 10-year 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 — apply in minutes.
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