Boilers

Shop high-quality boilers from trusted brands like Ideal Boilers, Vokera, Vaillant and Baxi. At Toolstation, you’ll find gas combi boilers and... 

Shop high-quality boilers from trusted brands like Ideal Boilers, Vokera, Vaillant and Baxi. At Toolstation, you’ll find gas combi boilers and system boilers compatible with most central heating systems.

What Are the Different Types of Boilers?

Combi boilers are a popular choice for many homes, heating water as you need it. They are smaller and more compact than system boilers, making them easier to install in any property.

System boilers store hot water in a cylinder after heating it, producing higher volumes on demand. They can be helpful for homes with two or more bathrooms. However, once the hot water supply has been used up, you’ll have to wait for the boiler to heat more.

Browse our full range of boilers and related accessories here, or check out our Boiler Buying Guide for more tips and advice on finding the right one for you.

 

How do I size a boiler for a house or building?

Boiler sizing depends on your heat load: number of radiators, insulation, number of bathrooms, and hot water demand. 
Use kW rating - oversize slightly rather than undersize, but avoid huge overspec. For instance, a mid-size home might need 24–30 kW for a combi boiler. Consult heat loss calculations or use a rule of thumb per radiator/room.

Can I swap one boiler brand for another?

Yes - in many cases you can - but ensure compatibility: flue position, gas supply, pipework routing, control connections, and warranty implications. Reusing existing mounting, boiler room layout, and condensate routes can reduce installation challenges.

How often should I service a boiler?

Servicing your boiler annually is standard for most boilers. Regular servicing helps maintain efficiency, catch faults early, ensure safety, extend lifespan, and keep the warranty valid. Also check for leaks, carbon monoxide safety, flue integrity, pressure, and proper burner operation.

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VokeraVokeraVokera / Vokera Vibe MAX Combi Boiler 26C 25kW
( 13 )

£638.99

ex. VAT £532.49Each

Worcester BoschWorcester Bosch / Worcester Greenstar Combi 4000 Boiler 30kW
Save£26

£1573.49Was £1599.98

ex. VAT £1311.24Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 1000 Combi Boiler 30kW

£910.00

ex. VAT £758.33Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 2000 Combi Boiler 30kW

£1206.49

ex. VAT £1005.41Each

GlowwormGlowworm / Glowworm Energy Heat Only Boiler 25kW

£1351.99

ex. VAT £1126.66Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 1000 Combi Boiler 24kW

£840.00

ex. VAT £700.00Each

Ideal BoilersIdeal Boilers / Ideal Logic+ Combi 2 Boiler ErP C30 30kW

£1349.99

ex. VAT £1124.99Each

VokeraVokeraVokera / Vokera Pinnacle Combi Boiler 35kW
( 1 )

£1081.99

ex. VAT £901.66Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 8000+ System Boiler 30kW

£1988.00

ex. VAT £1656.67Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 24Ri Boiler ErP+ LPG 24kW

£1551.99

ex. VAT £1293.32Each

VaillantVaillant / Vaillant ecoFIT Pure 825 Combi Boiler with Flue and Magnetic Filter  25kW
( 3 )

£1658.49

ex. VAT £1382.07Each

VaillantVaillant / Vaillant ecoFIT Pure 830 Combi Boiler with Flue and Magnetic Filter 30kW

£1731.99

ex. VAT £1443.32Each

Ideal BoilersIdeal Boilers / Ideal Logic+ Combi 2 Boiler ErP C24 24kW
( 1 )

£1169.49

ex. VAT £974.57Each

GlowwormGlowworm / Glowworm Energy Heat Only Boiler 30kW

£1415.99

ex. VAT £1179.99Each

VokeraVokeraVokera / Vokera Vibe MAX Combi Boiler 30C 30kW
( 13 )

£682.99

ex. VAT £569.16Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 28CDi Compact Combi Boiler 28kW

£1562.99

ex. VAT £1302.49Each

VaillantVaillant / Vaillant ecoTEC Plus 940 Combi Boiler 40kW (2 Boxes)

£2765.49

ex. VAT £2304.57Each

BaxiBaxi / Baxi 600 Combi 2 Boiler Range 24kW
( 1 )

£1009.49

ex. VAT £841.24Each

Made4TradeMade4Trade / Made4Trade Circular Flue Guard 280 x 165mm Plastic Coated
( 49 )

£13.59

ex. VAT £11.32Each

Worcester BoschWorcester Bosch / Worcester Greenstar Highflow 440CDi Floor Standing Combi Boiler 29kW

£3148.49

ex. VAT £2623.74Each

VaillantVaillant / Vaillant ecoFIT Pure 835 Combi Boiler with Flue and Magnetic Filter 35KW

£1868.49

ex. VAT £1557.07Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 36CDi Compact Combi Boiler 36kW

£2067.99

ex. VAT £1723.32Each

BaxiBaxi / Baxi 800 Combi 2 Boiler 36kW
( 4 )

Product code: 13762

Baxi 800 Combi 2 Boiler 36kW

£1794.00

ex. VAT £1495.00Each

VaillantVaillant / Vaillant ecoTEC Plus 832 32kW Combi Boiler Only Power

£2139.49

ex. VAT £1782.91Each

VokeraVokeraVokera / Vokera Unica MAX System Boiler 30kW
Save£218

£989.99Was £1208.38

ex. VAT £824.99Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 8000+ Combi Boiler 45kW

£2756.00

ex. VAT £2296.67Each

GlowwormGlowworm / Glowworm Energy Heat Only Boiler 12kW

£1174.99

ex. VAT £979.16Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 2000 Combi LPG Boiler 30kW

£1273.49

ex. VAT £1061.24Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 8000+ Combi Boiler 32kW

£1865.00

ex. VAT £1554.17Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 12Ri Boiler ErP+ 12kW

£1247.99

ex. VAT £1039.99Each

VokeraVokeraVokera / Vokera Pinnacle System Boiler 32kW

£1183.99

ex. VAT £986.66Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 2000 Combi Boiler 25kW

£1062.49

ex. VAT £885.41Each

VokeraVokera / Vokera HE Plume Management Kit All Flues
( 2 )

£82.49

ex. VAT £68.74Each

BaxiBaxi / Baxi 600 Series Combi 2 Boiler 36kW

£1304.99

ex. VAT £1087.49Each

PipeSnugPipeSnug / FlueSnug 100mm White
( 15 )

Product code: 94308

FlueSnug 100mm White

£19.79

ex. VAT £16.49Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 32CDi Compact Combi Boiler 32kW

£1762.49

ex. VAT £1468.74Each

BaxiBaxi / Baxi 800 Combi 2 Boiler 30kW
( 4 )

Product code: 31740

Baxi 800 Combi 2 Boiler 30kW

£1563.49

ex. VAT £1302.91Each

VokeraVokeraVokera / Vokera Synergy Combi Boiler 30kW
( 1 )

£875.99

ex. VAT £729.99Each

VaillantVaillant / Vaillant ecoTEC Plus 840 40kW Combi Boiler Only Power

£2412.49

ex. VAT £2010.41Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 8000+ Combi LPG Boiler 40kW

£2403.00

ex. VAT £2002.50Each

Worcester BoschWorcester Bosch / Worcester Greenstar Combi 4000 Boiler 25kW

£1474.49

ex. VAT £1228.74Each

GlowwormGlowworm / Glowworm Energy Combi Boiler 30kW

£1410.00

ex. VAT £1175.00Each

GlowwormGlowworm / Glowworm Energy Heat Only Boiler 15kW

£1236.99

ex. VAT £1030.82Each

VokeraVokeraVokera / Vokera Pinnacle Combi Boiler 30kW
( 1 )

£999.99

ex. VAT £833.32Each

VokeraVokeraVokera / Vokera Unica MAX System Boiler 20kW
Save£214
( 1 )

£914.84Was £1129.18

ex. VAT £762.37Each

Worcester BoschWorcester Bosch / Worcester Greenstar HE Standard Telescopic Flue

£148.99

ex. VAT £124.16Each

VaillantVaillant / Vaillant ecoTEC Plus 630 30kW System Boiler Only Power

£2213.99

ex. VAT £1844.99Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 27i Compact System Boiler 27kW

£1753.49

ex. VAT £1461.24Each