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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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Worcester BoschWorcester Bosch / Worcester Greenstar HE Standard Telescopic Flue

Product code: 85561

Worcester Greenstar HE Standard Telescopic Flue

£148.99

ex. VAT £124.16Each

GlowwormGlowworm / Glowworm Energy Heat Only Boiler 12kW

Product code: AH921

Glowworm Energy Heat Only Boiler 12kW

£1174.99

ex. VAT £979.16Each

Electric Heating CompanyElectric Heating Company / EHC COMET Electric Boiler 12kW
( 1 )

Product code: 44405

EHC COMET Electric Boiler 12kW

£1265.99

ex. VAT £1054.99Each

Electric Heating CompanyElectric Heating Company / EHC Comet PV Electric System Boiler 2-8kW

Product code: AE721

EHC Comet PV Electric System Boiler 2-8kW

£1229.99

ex. VAT £1024.99Each

VaillantVaillant / Vaillant ecoTEC Plus 615 System Boiler 15kW

Product code: AH913

Vaillant ecoTEC Plus 615 System Boiler 15kW

£1579.99

ex. VAT £1316.66Each

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

Product code: AH952

Worcester Bosch Greenstar 27i Compact System Boiler 27kW

£1753.49

ex. VAT £1461.24Each

VokeraVokera / Vokera Unica MAX Combi Boiler 40kW

Product code: 20331

Vokera Unica MAX Combi Boiler 40kW

£961.64

ex. VAT £801.37Each

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

Product code: 74670

Vokera HE Plume Management Kit All Flues

£82.49

ex. VAT £68.74Each

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

Product code: AH964

Worcester Bosch Greenstar 8000+ Regular LPG Boiler 40kW

£2747.99

ex. VAT £2289.99Each

Worcester BoschWorcester Bosch / Worcester Greenstar Combi 4000 Boiler 25kW

Product code: 28922

Worcester Greenstar Combi 4000 Boiler 25kW

£1474.49

ex. VAT £1228.74Each

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

Product code: 51926

Vaillant ecoTEC Plus 630 30kW System Boiler Only Power

£2213.99

ex. VAT £1844.99Each

VokeraVokera / Vokera Vertical Flue Kit Compact A DIN, Vision, Evolve & Unica MAX
( 2 )

Product code: 21716

Vokera Vertical Flue Kit Compact A DIN, Vision, Evolve & Unica MAX

£154.49

ex. VAT £128.74Each

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

Product code: AH967

Worcester Bosch Greenstar 8000+ Regular Boiler 30kW

£1922.49

ex. VAT £1602.07Each

GlowwormGlowworm / Glowworm Energy Combi Boiler 35kW

Product code: AH917

Glowworm Energy Combi Boiler 35kW

£1589.99

ex. VAT £1324.99Each

PipeSnugPipeSnug / FlueSnug 100mm Black
( 15 )

Product code: 23885

FlueSnug 100mm Black

£17.39

ex. VAT £14.49Each

VokeraVokeraVokera / Vokera Synergy Combi Boiler 30kW
( 1 )

Product code: 95889

Vokera Synergy Combi Boiler 30kW

£875.99

ex. VAT £729.99Each

VokeraVokera / Vokera Pitched Roof Flashing Kit All Flues
( 1 )

Product code: 15241

Vokera Pitched Roof Flashing Kit All Flues

£61.99

ex. VAT £51.66Each

Ideal BoilersIdeal Boilers / Ideal Logic Max Combi 2 Boiler 35kW
( 2 )

Product code: 11793

Ideal Logic Max Combi 2 Boiler 35kW

£1921.99

ex. VAT £1601.66Each

VokeraVokera / Vokera Telescopic Horizontal Flue Kit Compact A DIN, Vision, Evolve & Unica MAX
( 4 )

Product code: 81063

Vokera Telescopic Horizontal Flue Kit Compact A DIN, Vision, Evolve & Unica MAX

£105.99

ex. VAT £88.32Each

Worcester BoschWorcester Bosch / Worcester Bosch EasyControl CT 200 Black

Product code: AE567

Worcester Bosch EasyControl CT 200 Black

£204.48

ex. VAT £170.40Each

GlowwormGlowworm / Glowworm Energy Heat Only Boiler 18kW

Product code: AH919

Glowworm Energy Heat Only Boiler 18kW

£1299.49

ex. VAT £1082.91Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 4000 Combi LPG Boiler 25kW

Product code: AI001

Worcester Bosch Greenstar 4000 Combi LPG Boiler 25kW

£1570.99

ex. VAT £1309.16Each

VokeraVokeraVokera / Vokera Pinnacle System Boiler 32kW

Product code: 73667

Vokera Pinnacle System Boiler 32kW

£1183.99

ex. VAT £986.66Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 4000 System Boiler 24kW

Product code: AH975

Worcester Bosch Greenstar 4000 System Boiler 24kW

£1726.99

ex. VAT £1439.16Each

Electric Heating CompanyElectric Heating Company / EHC ASTRO V2 Electric Wall Mounted Combi Boiler 14.4kW

Product code: 28513

EHC ASTRO V2 Electric Wall Mounted Combi Boiler 14.4kW

£1579.99

ex. VAT £1316.66Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 4000 System Boiler 21kW

Product code: AH976

Worcester Bosch Greenstar 4000 System Boiler 21kW

£1673.99

ex. VAT £1394.99Each

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

Product code: AH977

Worcester Bosch Greenstar 2000 Combi LPG Boiler 25kW

£1146.49

ex. VAT £955.41Each

Ideal BoilersIdeal Boilers / Ideal Logic Max Combi 2 Boiler 30kW
( 2 )

Product code: 82539

Ideal Logic Max Combi 2 Boiler 30kW

£1692.99

ex. VAT £1410.82Each

Electric Heating CompanyElectric Heating Company / EHC ASTRO V2 Electric Wall Mounted Combi Boiler 12kW

Product code: 93540

EHC ASTRO V2 Electric Wall Mounted Combi Boiler 12kW

£1346.99

ex. VAT £1122.49Each

VokeraVokera / Vokera Wall Brackets All Boilers
( 1 )

Product code: 39332

Vokera Wall Brackets All Boilers

£44.49

ex. VAT £37.07Each

PipeSnugPipeSnug / FlueSnug 100mm White
( 15 )

Product code: 94308

FlueSnug 100mm White

£19.79

ex. VAT £16.49Each

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

Product code: 13762

Baxi 800 Combi 2 Boiler 36kW

£1794.00

ex. VAT £1495.00Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 4000 System Boiler 15kW

Product code: AH996

Worcester Bosch Greenstar 4000 System Boiler 15kW

£1505.49

ex. VAT £1254.57Each

Made4TradeMade4Trade / Made4Trade Circular Flue Guard 280 x 165mm Zinc Plated Mild Steel
( 21 )

Product code: 44728

Made4Trade Circular Flue Guard 280 x 165mm Zinc Plated Mild Steel

£19.99

ex. VAT £16.66Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 4000 System LPG Boiler 24kW

Product code: AH971

Worcester Bosch Greenstar 4000 System LPG Boiler 24kW

£1816.49

ex. VAT £1513.74Each

BaxiBaxi / Baxi 600 Series Combi 2 Boiler 36kW

Product code: 71310

Baxi 600 Series Combi 2 Boiler 36kW

£1304.99

ex. VAT £1087.49Each

VokeraVokeraVokera / Vokera Synergy Combi Boiler 25kW

Product code: 45288

Vokera Synergy Combi Boiler 25kW

£845.99

ex. VAT £704.99Each

Worcester BoschWorcester Bosch / Worcester Bosch Greenstar 4000 Combi LPG Boiler 30kW

Product code: AH993

Worcester Bosch Greenstar 4000 Combi LPG Boiler 30kW

£1718.99

ex. VAT £1432.49Each

GlowwormGlowworm / Glowworm Energy System Boiler 30kW

Product code: AH916

Glowworm Energy System Boiler 30kW

£1456.99

ex. VAT £1214.16Each

BaxiBaxi / Baxi 800 Combi 2 Boiler 24kW
( 1 )

Product code: 62654

Baxi 800 Combi 2 Boiler 24kW

£1386.99

ex. VAT £1155.82Each

VaillantVaillant / Vaillant ecoTEC Plus 826 26kW Combi Boiler Only Power

Product code: 86285

Vaillant ecoTEC Plus 826 26kW Combi Boiler Only Power

£1950.49

ex. VAT £1625.41Each

VokeraVokera / Vokera Rear Flue Kit Compact A DIN, Vision, Evolve & Unica MAX
( 2 )

Product code: 93141

Vokera Rear Flue Kit Compact A DIN, Vision, Evolve & Unica MAX

£95.49

ex. VAT £79.57Each

Ideal BoilersIdeal Boilers / Ideal Logic+ Horizontal Flue Terminal

Product code: 14023

Ideal Logic+ Horizontal Flue Terminal

£125.49

ex. VAT £104.57Each

VokeraVokera / Vokera 90° Flue Bend All Flues
( 1 )

Product code: 88383

Vokera 90° Flue Bend All Flues

£53.99

ex. VAT £44.99Each

VokeraVokera / Vokera Flat Roof Flashing Kit All Flues

Product code: 39407

Vokera Flat Roof Flashing Kit All Flues

£48.99

ex. VAT £40.82Each

Ideal BoilersIdeal Boilers / Ideal Logic Max System 2 Boiler 24kW

Product code: 89898

Ideal Logic Max System 2 Boiler 24kW

£1807.49

ex. VAT £1506.24Each

Ideal BoilersIdeal Boilers / Ideal Logic/Vogue Telescopic Flue Combi/System
( 3 )

Product code: 34509

Ideal Logic/Vogue Telescopic Flue Combi/System

£149.49

ex. VAT £124.57Each

VokeraVokera / Vokera Flue Extension 2m

Product code: 12862

Vokera Flue Extension 2m

£124.99

ex. VAT £104.16Each