Baxi
Baxi 800 Combi
A compact, high-efficiency combi available in 25 kW, 30 kW and 35 kW outputs. ErP A-rated with built-in frost protection and a 7-year manufacturer warranty option.
Enquire by phoneThe right combi for your home
A combi boiler provides central heating and instant hot water from a single compact unit — no separate hot water cylinder or cold water tank needed. They're the most popular boiler type in UK homes, and we stock models from Baxi, Ideal, Keston, Potterton, Vaillant, Worcester Bosch and Glow-worm.
Not sure which output rating or brand suits your property? Call us on 01494 580033 — Gurpreet and the team are happy to advise before you buy.
Combi boiler at a glance
- No hot water cylinder required
- Instant hot water on demand
- Compact — fits in a standard kitchen cupboard
- Output ratings from 24 kW to 42 kW
Combi boilers in stock
Call 01494 580033 or email sales@asbplumbheat.co.uk to check availability and pricing.
Ideal
Ideal Logic+ Combi
One of the UK's best-selling combi ranges. Available from 24 kW to 35 kW, with a simple flue system and a 10-year warranty when installed by a registered engineer.
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Vaillant
Vaillant ecoFIT pure Combi
German-engineered reliability in a slim casing. The ecoFIT pure range runs from 25 kW to 35 kW and is compatible with Vaillant's vSMART and sensoHOME controls.
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Worcester Bosch
Greenstar 4000 Combi
The Greenstar 4000 is a mid-range combi with outputs from 25 kW to 35 kW. Quiet operation, a large backlit display, and up to 10-year warranty with registration.
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Potterton
Potterton Titanium Combi
A reliable, no-fuss combi from a long-established British brand. Available in 24 kW, 28 kW and 33 kW outputs, with a straightforward installation and a 5-year warranty.
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Glow-worm
Glow-worm Energy Combi
The Energy range offers ErP A-rated efficiency at a competitive price point. Outputs from 25 kW to 35 kW, with a 2-year parts and labour warranty as standard.
Enquire by phoneOther boiler types
System Boilers
Works with a hot water cylinder — ideal for homes with higher hot water demand.
Heat Only Boilers
Traditional open-vented boilers for older heating systems with a feed-and-expansion tank.
Boiler Parts
Replacement parts for all major brands — often available same day from our Chesham store.
Not sure which combi is right for you?
Call us — we'll help you match the right output and brand to your property before you commit to a purchase.