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: 38523
Vaillant ecoTEC Plus 836 36kW Combi Boiler Only Power
£2159.98
ex. VAT £1799.98 Each
Select from 3 options
Product code: 23473
EHC ASTRO V2 Electric Wall Mounted Combi Boiler 24kW
£1635.78
ex. VAT £1363.15 Each
Select from 1 option
Product code: 95386
Baxi 600 Series Combi 2 Boiler 30kW
£1199.99
ex. VAT £999.99 Each
Select from 2 options
Product code: AH988
Worcester Bosch Greenstar 15Ri Boiler ErP+ 15kW
£1239.49
ex. VAT £1032.91 Each
Select from 4 options
Product code: 53968
EHC SLIM JIM Electric Flow Boiler 14.4kW
£849.00 was £904.28
ex. VAT £707.50 Each
Select from 4 options
Product code: 27352
Vokera Unica MAX System Boiler 30kW
£1087.54 was £1208.38
ex. VAT £906.28 Each
Select from 1 option
Product code: 28922
Worcester Greenstar Combi 4000 Boiler 25kW
£1419.98
ex. VAT £1183.32 Each
Select from 1 option
Product code: 66570
Vaillant ecoTEC Plus 625 25kW System Boiler Only Power
£1922.78
ex. VAT £1602.32 Each
Select from 1 option
Product code: 31392
EHC SLIM JIM Electric Flow Boiler 10kW
£790.00 was £818.68
ex. VAT £658.33 Each
Select from 4 options
Product code: 71310
Baxi 600 Series Combi 2 Boiler 36kW
£1439.98 was £1599.98
ex. VAT £1199.98 Each
Select from 2 options
Product code: 28513
EHC ASTRO V2 Electric Wall Mounted Combi Boiler 14.4kW
£1451.48
ex. VAT £1209.57 Each
Select from 1 option
Product code: 60705
EHC SLIM JIM Electric Flow Boiler 4kW
£724.00
ex. VAT £603.33 Each
Select from 4 options
Product code: AE723
EHC Comet PV Electric System Boiler 12-24kW 3 Phase 400V
£1859.98
ex. VAT £1549.98 Each
Select from 2 options
Product code: AB005
Viessmann Vitodens 100-W Combi Boiler 26kW
£1896.16
ex. VAT £1580.13 Each
Select from 1 option
Product code: 82539
Ideal Logic Max Combi 2 Boiler 30kW
£1589.54
ex. VAT £1324.62 Each
Select from 2 options
Product code: 36378
Ideal Logic+ Combi 2 Boiler ErP C30 30kW
£1299.98
ex. VAT £1083.32 Each
Select from 1 option
Product code: 44728
Made4Trade Circular Flue Guard 280 x 165mm Zinc Plated Mild Steel
£15.00 was £19.98
ex. VAT £12.50 Each
Select from 1 option
Product code: 73228
Vokera Pinnacle Combi Boiler 35kW
£978.98 was £1165.09
ex. VAT £815.82 Each
Select from 1 option
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: 16456
Vaillant Flue Extension ecoMAX/TEC 2m
£134.18
ex. VAT £111.82 Each
Select from 2 options
Product code: 62654
Baxi 800 Combi 2 Boiler 24kW
£1376.98 was £1529.98
ex. VAT £1147.48 Each
Select from 2 options