Gas boiler brands A–Z
This is our list of gas boiler makers you'll find in UK homes. Some are household names, and some are smaller or older brands. We add more makers and models as we check them.
Each brand has its own page. It covers their boiler ranges, common fault codes and manuals. We also link to each maker's own website.
Not sure which make you have? The name is usually on the front of the boiler. If it's worn off, see how to find your boiler's model and GC number.
- Alpha
Boiler maker based in Kent since 1966. Part of the Italian Immergas Group.
Ranges: E-Tec Plus NX, E-Tec NX, Evoke NX, E-Tec NXS, E-Tec Regular
- Ariston
Italian brand that began in 1930. Its group also owns Vokera.
Ranges: Alteas One+ Net, Genus One+ WiFi, Clas One, Clas System One, E-System One, Clas One R
- ATAG
Known for long warranties. Its boiler names start with a small i, such as iC and iS.
Ranges: iC Economiser, iC Combination, iS System, iR Regular
- Baxi
British maker since 1866. Sister brands include Potterton and Main.
Ranges: Baxi 400 Combi 2, Baxi 600 Combi 2, Baxi 800 Combi 2, Baxi 600 System 2, Baxi 800 System 2, Baxi 400 Heat, Baxi 600 Heat, Baxi 800 Heat, Baxi Platinum Compact Combi, Baxi Duo-tec Compact Combi
- Biasi
Italian maker founded in 1938. Biasi UK has been based in Walsall since 1990.
Ranges: RinNova Adaptive, Dina, Antares, Inovia Tec
- Ferroli
Italian heating group with a UK office in Derbyshire. It sells one home gas combi in the UK, the Bluehelix Hitech RRT C.
Ranges: Bluehelix Hitech RRT C
- Glow-worm
British brand in the Vaillant Group. Newer models share many fault codes with Vaillant.
Ranges: Energy, Ultimate, Easicom
- Ideal
Boiler maker based in Hull. Known for the Logic and Vogue ranges.
Ranges: Logic2 Max, Vogue Max
- Intergas
Dutch-designed boilers known for the bithermic heat exchanger. Part of Rheem since 2019.
Ranges: Xtreme, Xclusive, Rapid, Rapid Plus, Eco RF, Combi Compact HRE
- Keston
Twin flue boilers from the same company as Ideal, in Hull.
Ranges: Combi 2 C30 and C35, System 2 S30, Heat 2 45 and 55
- Main
Baxi's sister brand. Main boilers are now sold as the Baxi MainEco Compact.
Ranges: Baxi MainEco Compact Combi, Baxi MainEco Compact System, Baxi MainEco Compact Heat
- Navien
South Korean maker. It has sold gas boilers in the UK since 2014.
Ranges: NCB700 ON Combi Crossover, NCB500 ON Combi Crossover
- Potterton
A Baxi sister brand. Baxi still sells one Potterton boiler, the Titanium Heat.
Ranges: Potterton Titanium Heat
- Vaillant
German maker founded in 1874. Its gas boilers carry the ecoTEC and ecoFIT names.
Ranges: ecoTEC plus, ecoTEC pro, ecoTEC exclusive, ecoFIT pure
- Viessmann
German maker founded in 1917, now part of Carrier. Its gas boilers use the Vitodens name.
Ranges: Vitodens classic, Vitodens 025-W, Vitodens 050-W, Vitodens 100-W, Vitodens 111-W, Vitodens 200-W, Vitodens 222-F, Vitodens 100-W Heat Only
- Vokera
A UK and Irish boiler brand for over 40 years. Part of the Ariston Group.
Ranges: Pinnacle, Pinnacle S, Synergy, Synergy S, Vibe MAX, Vibe MAX S, Easi-Heat i
- Worcester Bosch
One of the best-known UK boiler makers. Most of its gas boilers carry the Greenstar name.
Ranges: Greenstar 1000, Greenstar 2000, Greenstar 4000, Greenstar 4000 System, Greenstar 8000, Greenstar CDi Compact, Greenstar i System Compact, Greenstar Ri
Combi, system or regular?
Most makers sell three types of gas boiler. Knowing yours helps you pick the right manual.
- Combi: heats your radiators and gives hot water straight from the tap. There's no hot water tank.
- System: heats your radiators and a hot water cylinder, usually kept in an airing cupboard.
- Regular: also called "heat only". It works with a cylinder and with tanks in the loft.
Brands that belong together
Many boiler brands are owned by the same few groups. Sister brands often share parts, controls and even fault codes. Here are the groups we've checked so far:
- Vaillant Group: Vaillant and Glow-worm. Newer Vaillant and Glow-worm boilers share many F codes.
- BDR Thermea Group: Baxi, Potterton and Main. The Potterton and Main websites now point to Baxi.
- Ariston Group: Ariston and Vokera.
- Ideal: Ideal and Keston. Keston boilers are made by Ideal in Hull.
- Immergas Group: Alpha.
- Rheem: Intergas.
- Carrier: Viessmann.
- Bosch Group: Worcester Bosch.