Boilers
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.
Product code: 27352
Vokera Unica MAX System Boiler 30kW
£1087.54 was £1208.38
ex. VAT £906.28 Each
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Product code: 45331
Baxi 600 Combi 2 Boiler Range 24kW
£1124.98 was £1249.98
ex. VAT £937.48 Each
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Product code: AH954
Worcester Bosch Greenstar 28CDi Compact Combi Boiler 28kW
£1487.28
ex. VAT £1239.40 Each
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Product code: 19387
Vokera Fixed Length Horizontal Flue Kit Compact A DIN, Vision, Evolve & Unica MAX
£86.96 was £107.86
ex. VAT £72.47 Each
Product code: 73228
Vokera Pinnacle Combi Boiler 35kW
£978.98 was £1165.09
ex. VAT £815.82 Each
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Product code: AH951
Worcester Bosch Greenstar 36CDi Compact Combi Boiler 36kW
£1967.57
ex. VAT £1639.64 Each
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Product code: 85188
Ideal Logic+ Combi 2 Boiler ErP C24 24kW
£1126.24
ex. VAT £938.53 Each
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Product code: 86285
Vaillant ecoTEC Plus 826 26kW Combi Boiler Only Power
£1859.98
ex. VAT £1549.98 Each
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Product code: AH956
Worcester Bosch Greenstar 30Ri Compact Regular LPG Boiler 30kW
£1691.95
ex. VAT £1409.96 Each
Product code: AB005
Viessmann Vitodens 100-W Combi Boiler 26kW
£1896.16
ex. VAT £1580.13 Each
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Product code: 89898
Ideal Logic Max System 2 Boiler 24kW
£1739.98
ex. VAT £1449.98 Each
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Product code: 53968
EHC SLIM JIM Electric Flow Boiler 14.4kW
£849.00 was £904.28
ex. VAT £707.50 Each
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Product code: 38523
Vaillant ecoTEC Plus 836 36kW Combi Boiler Only Power
£2159.98
ex. VAT £1799.98 Each
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Product code: 81063
Vokera Telescopic Horizontal Flue Kit Compact A DIN, Vision, Evolve & Unica MAX
£101.70
ex. VAT £84.75 Each
Product code: 60705
EHC SLIM JIM Electric Flow Boiler 4kW
£724.00
ex. VAT £603.33 Each
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Product code: 97148
Ideal Logic Max Combi 2 Boiler 24kW
£1447.58
ex. VAT £1206.32 Each
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Product code: 11793
Ideal Logic Max Combi 2 Boiler 35kW
£1788.44
ex. VAT £1490.37 Each
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Product code: 28922
Worcester Greenstar Combi 4000 Boiler 25kW
£1419.98
ex. VAT £1183.32 Each
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Product code: AH987
Worcester Bosch Greenstar 12Ri Boiler ErP+ 12kW
£1192.68
ex. VAT £993.90 Each
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Product code: 26393
Ideal Vogue Max Combi Boiler 26kW
£1679.98
ex. VAT £1399.98 Each
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