Central Heating Supplies
Boilers

Boilers

(196 products)

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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Viessmann / Viessmann Vitodens Flue Extension 1m

( 1 )

Product code: 17436

Viessmann Vitodens Flue Extension 1m

£48.49

ex. VAT £40.41 Each

quantity

Product code: AH912

Glowworm Energy Combi Boiler 30kW

£1410.00

ex. VAT £1175.00 Each

quantity

Product code: 66570

Vaillant ecoTEC Plus 625 25kW System Boiler Only Power

£2044.49

ex. VAT £1703.74 Each

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Baxi / Baxi Flue Pipe Support Flue Bracket

( 5 )

Product code: 77434

Baxi Flue Pipe Support Flue Bracket

£14.99

ex. VAT £12.49 Each

quantity

Product code: AH977

Worcester Bosch Greenstar 2000 Combi LPG Boiler 25kW

£1146.49

ex. VAT £955.41 Each

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Ideal Boilers / Ideal Logic Max Combi 2 Boiler 35kW

( 2 )

Product code: 11793

Ideal Logic Max Combi 2 Boiler 35kW

£1921.99

ex. VAT £1601.66 Each

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( 1 )

Product code: 26406

Baxi Roof Flashing Pitched

£63.49

ex. VAT £52.91 Each

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Product code: 35227

Ideal Logic Flue Extension 0.5m

£66.99

ex. VAT £55.82 Each

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Viessmann / Viessmann Vitodens Telescopic Flue Kit

( 2 )

Product code: 14613

Viessmann Vitodens Telescopic Flue Kit

£136.49

ex. VAT £113.74 Each

quantity

( 1 )

Product code: 14667

Baxi Plume Displacement Kit 93°

£47.69

ex. VAT £39.74 Each

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Product code: AC484

Glow-worm Standard Telescopic Flue Kit

£162.49

ex. VAT £135.41 Each

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Product code: 12862

Vokera Flue Extension 2m

£124.99

ex. VAT £104.16 Each

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Product code: AH910

Glow-worm Energy System Boiler 25kW

£1389.99

ex. VAT £1158.32 Each

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Product code: 32713

Vaillant ecoMAX/TEC Elbow 90°

£77.49

ex. VAT £64.57 Each

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Product code: AC494

Glow-worm Energy Vertical Flue Adaptor 60/100mm

£32.99

ex. VAT £27.49 Each

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Product code: 38523

Vaillant ecoTEC Plus 836 36kW Combi Boiler Only Power

£2265.49

ex. VAT £1887.91 Each

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Product code: 22602

Ideal Logic Flue Extension 1m

£84.99

ex. VAT £70.82 Each

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Product code: 45288

Vokera Synergy Combi Boiler 25kW

£845.99

ex. VAT £704.99 Each

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Product code: 86285

Vaillant ecoTEC Plus 826 26kW Combi Boiler Only Power

£1950.49

ex. VAT £1625.41 Each

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Product code: AE723

EHC Comet PV Electric System Boiler 12-24kW 3 Phase 400V

£1859.99

ex. VAT £1549.99 Each

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Product code: AE522

Glowworm Hor/Ver 90 Degree Bend

£54.49

ex. VAT £45.41 Each

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Product code: AC493

Vaillant 22mm Filter Boiler Protection Kit

£231.99

ex. VAT £193.32 Each

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Product code: AH902

Glowworm Climapro 2 Radio Frequency Control White

£194.99

ex. VAT £162.49 Each

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Ideal Boilers / Ideal Logic Roof Flue Kit

( 1 )

Product code: 48029

Ideal Logic Roof Flue Kit

£224.49

ex. VAT £187.07 Each

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Product code: AH989

Worcester Bosch Greenstar 24Ri Boiler ErP+ LPG 24kW

£1551.99

ex. VAT £1293.32 Each

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Product code: AC481

Worcester Greenstar HE Keyless Filling Link

£47.89

ex. VAT £39.91 Each

quantity

Product code: AE568

Vaillant ecoTEC Spacer Frame

£85.99

ex. VAT £71.66 Each

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Product code: AC482

Worcester Greenstar Plume Kit

£114.94

ex. VAT £95.78 Each

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Product code: 23473

EHC ASTRO V2 Electric Wall Mounted Combi Boiler 24kW

£1770.99

ex. VAT £1475.82 Each

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Product code: AC491

Glow-worm Rear Flue Kit

£160.49

ex. VAT £133.74 Each

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Product code: 47534

Viessmann Vitodens Flue Extension 0.5m

£42.49

ex. VAT £35.41 Each

quantity

Vaillant / Vaillant Flue Extension ecoMAX/TEC 1m

( 1 )

Product code: 79295

Vaillant Flue Extension ecoMAX/TEC 1m

£84.99

ex. VAT £70.82 Each

quantity

Product code: 92723

Vaillant Vertical Roof Terminal Black

£209.49

ex. VAT £174.57 Each

quantity

Product code: 14023

Ideal Logic+ Horizontal Flue Terminal

£125.49

ex. VAT £104.57 Each

quantity

Product code: 90234

Ideal Universal Weather Collar

£75.99

ex. VAT £63.32 Each

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Product code: AH994

Worcester Bosch Greenstar 4000 System Boiler 12kW

£1435.00

ex. VAT £1195.83 Each

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Product code: AH996

Worcester Bosch Greenstar 4000 System Boiler 15kW

£1505.49

ex. VAT £1254.57 Each

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Product code: AH975

Worcester Bosch Greenstar 4000 System Boiler 24kW

£1726.99

ex. VAT £1439.16 Each

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Product code: 71310

Baxi 600 Series Combi 2 Boiler 36kW

£1599.99

ex. VAT £1333.32 Each

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Product code: 60705

EHC SLIM JIM Electric Flow Boiler 4kW

£749.99

ex. VAT £624.99 Each

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Ideal Boilers / Ideal Logic Flue Extension 2m

( 1 )

Product code: 12436

Ideal Logic Flue Extension 2m

£143.99

ex. VAT £119.99 Each

quantity

Product code: AE505

FS5 FlueSnug 100mm Black

£18.49

ex. VAT £15.41 Each

quantity

Product code: AH985

Worcester Bosch Greenstar 21Ri Boiler ErP+ LPG 21kW

£1514.99

ex. VAT £1262.49 Each

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Vokera / 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 £79.57 Each

quantity

Vaillant / Vaillant ecoTEC Flue Support Clips

( 1 )

Product code: 89726

Vaillant ecoTEC Flue Support Clips

£72.49

ex. VAT £60.41 Per unit £14.50/Each

quantity

Product code: 38325

Vaillant ecoMAX/TEC Adjustable Flue Support Clips

£77.49

ex. VAT £64.57 Per unit £25.83/Each

quantity

Product code: 43491

Ideal Logic/Independent Vertical Flue Connector Kit

£88.49

ex. VAT £73.74 Each

quantity

Product code: AE504

Glow-worm Adjustable Fixing Brackets

£66.99

ex. VAT £55.82 3 Pack

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