Combi Boilers

(62 products)

Shop high-performance combi boilers from trusted brands at Toolstation, including Vokera, Ideal Boilers, Vaillant, Viessmann and Baxi. Whether you...

Shop high-performance combi boilers from trusted brands at Toolstation, including Vokera, Ideal Boilers, Vaillant, Viessmann and Baxi. Whether you need a small combi boiler for your home or an industrial combi boiler for the workplace, we’ve got plenty of products available.

What is a Combi Boiler?

A combi (combination) boiler gives you heating and hot water straight from one compact unit. No tanks, no cylinders – it heats water as you need it. Perfect if you want to save space and keep the job simple.

What size combi boiler do I need?

It depends on the job:

Small homes or flats (up to 10 rads) – go for 24–27 kW
Medium homes (up to 15 rads) – 28–34 kW
Bigger jobs with more bathrooms – 35–42 kW

Get it right and you’ll have enough hot water and heat without overworking the boiler.

Are combi boilers energy‑efficient?

Yes. Most new combis are A‑rated and run at 90%+ efficiency. That means less fuel wasted and lower bills. Fit it right, set it up properly, and it’ll run efficiently.

Are combi boilers suitable for flats or small homes?

Yes. Combi boilers are built for places where space is tight. With no need for a hot water cylinder, you can fit one neatly in a cupboard or kitchen unit.

How long do combi boilers last?

On average, combi boilers 10–15 years with regular servicing. Look after it, flush the system when needed, and replace worn parts early to keep it running longer.

What Is the Best Combi Boiler?

If you’re wondering how to choose the right combi boiler, there are a few factors to consider. As a general rule, the more hot water you use, the higher the kilowatt rating you’ll need. For example, if you live in a flat or house with up to ten radiators and one bathroom, a 24-27kw combi boiler is the ideal choice. For homes with up to fifteen radiators and two bathrooms, a 28-34kw combi boiler is best. Large homes or businesses with up to twenty radiators and two or more bathrooms should opt for a 35-42kw boiler. Combi boilers are often the most energy-efficient choice in any central heating system, with options available to suit all budgets and home configurations. Check out our Boiler Buying Guide for more details on these and other boilers.

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Product code: 87909

Vaillant ecoTEC Plus 832 32kW Combi Boiler Only Power

£2139.49

ex. VAT £1782.91 Each

quantity

Worcester Bosch / Worcester Greenstar Combi 4000 Boiler 30kW

Save £26

Product code: 82864

Worcester Greenstar Combi 4000 Boiler 30kW

£1573.49 was £1599.98

ex. VAT £1311.24 Each

quantity

Vokera / Vokera Vibe MAX Combi Boiler 30C 30kW

( 13 )

Product code: 27309

Vokera Vibe MAX Combi Boiler 30C 30kW

£682.99

ex. VAT £569.16 Each

quantity

Product code: 86285

Vaillant ecoTEC Plus 826 26kW Combi Boiler Only Power

£1950.49

ex. VAT £1625.41 Each

quantity

Product code: AH972

Worcester Bosch Greenstar 1000 Combi Boiler 24kW

£765.99

ex. VAT £638.32 Each

quantity

Vaillant / Vaillant ecoFIT Pure 825 Combi Boiler with Flue and Magnetic Filter 25kW

( 3 )

Product code: 34270

Vaillant ecoFIT Pure 825 Combi Boiler with Flue and Magnetic Filter 25kW

£1658.49

ex. VAT £1382.07 Each

quantity

Vokera / Vokera Pinnacle Combi Boiler 35kW

( 1 )

Product code: 73228

Vokera Pinnacle Combi Boiler 35kW

£1081.99

ex. VAT £901.66 Each

quantity

Product code: AH953

Worcester Bosch Greenstar 32CDi Compact Combi Boiler 32kW

£1762.49

ex. VAT £1468.74 Each

quantity

Product code: 21888

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

£1731.99

ex. VAT £1443.32 Each

quantity

Product code: 98543

Vaillant ecoTEC Plus 840 40kW Combi Boiler Only Power

£2412.49

ex. VAT £2010.41 Each

quantity

Product code: AH981

Worcester Bosch Greenstar 1000 Combi Boiler 30kW

£841.99

ex. VAT £701.66 Each

quantity

Product code: AH979

Worcester Bosch Greenstar 8000+ Combi Boiler 45kW

£2651.99

ex. VAT £2209.99 Each

quantity

Product code: 20935

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

£1868.49

ex. VAT £1557.07 Each

quantity

Product code: AH978

Worcester Bosch Greenstar 8000+ Combi Boiler 32kW

£1794.99

ex. VAT £1495.82 Each

quantity

Product code: 95889

Vokera Synergy Combi Boiler 30kW

£875.99

ex. VAT £729.99 Each

quantity

Product code: 36378

Ideal Logic+ Combi 2 Boiler ErP C30 30kW

£1349.99

ex. VAT £1124.99 Each

quantity

Vokera / Vokera Pinnacle Combi Boiler 30kW

( 1 )

Product code: 81799

Vokera Pinnacle Combi Boiler 30kW

£999.99

ex. VAT £833.32 Each

quantity

Ideal Boilers / Ideal Logic+ Combi 2 Boiler ErP C24 24kW

( 1 )

Product code: 85188

Ideal Logic+ Combi 2 Boiler ErP C24 24kW

£1169.49

ex. VAT £974.57 Each

quantity

Product code: AI006

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

£2635.99

ex. VAT £2196.66 Each

quantity

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

quantity

Product code: 38523

Vaillant ecoTEC Plus 836 36kW Combi Boiler Only Power

£2265.49

ex. VAT £1887.91 Each

quantity

Product code: 28922

Worcester Greenstar Combi 4000 Boiler 25kW

£1474.49

ex. VAT £1228.74 Each

quantity

Vokera / Vokera Vibe MAX Combi Boiler 26C 25kW

( 13 )

Product code: 36777

Vokera Vibe MAX Combi Boiler 26C 25kW

£638.99

ex. VAT £532.49 Each

quantity

Product code: AH986

Worcester Bosch Greenstar 2000 Combi Boiler 25kW

£1022.99

ex. VAT £852.49 Each

quantity

Product code: 45288

Vokera Synergy Combi Boiler 25kW

£845.99

ex. VAT £704.99 Each

quantity

Product code: AH951

Worcester Bosch Greenstar 36CDi Compact Combi Boiler 36kW

£2067.99

ex. VAT £1723.32 Each

quantity

( 4 )

Product code: 13762

Baxi 800 Combi 2 Boiler 36kW

£2199.99

ex. VAT £1833.32 Each

quantity

Product code: AH912

Glowworm Energy Combi Boiler 30kW

£1344.99

ex. VAT £1120.82 Each

quantity

Product code: 71310

Baxi 600 Series Combi 2 Boiler 36kW

£1599.99

ex. VAT £1333.32 Each

quantity

Ideal Boilers / Ideal Vogue Max Combi Boiler 40kW

( 1 )

Product code: 10268

Ideal Vogue Max Combi Boiler 40kW

£2077.99

ex. VAT £1731.66 Each

quantity

Product code: AH993

Worcester Bosch Greenstar 4000 Combi LPG Boiler 30kW

£1653.99

ex. VAT £1378.32 Each

quantity

Product code: AH909

Glowworm Energy Combi Boiler 25kW

£1249.99

ex. VAT £1041.66 Each

quantity

Product code: AH917

Glowworm Energy Combi Boiler 35kW

£1515.99

ex. VAT £1263.32 Each

quantity

Product code: AH961

Worcester Bosch Greenstar 30i Compact System LPG Boiler 30kW

£1907.99

ex. VAT £1589.99 Each

quantity

Product code: AE567

Worcester Bosch EasyControl CT 200 Black

£204.48

ex. VAT £170.40 Each

quantity

Product code: AH954

Worcester Bosch Greenstar 28CDi Compact Combi Boiler 28kW

£1562.99

ex. VAT £1302.49 Each

quantity

Product code: AH984

Worcester Bosch Greenstar 2000 Combi LPG Boiler 30kW

£1225.99

ex. VAT £1021.66 Each

quantity

Product code: AH965

Worcester Bosch Greenstar 8000+ Combi LPG Boiler 50kW

£3160.99

ex. VAT £2634.16 Each

quantity

Product code: AH983

Worcester Bosch Greenstar 8000+ Combi LPG Boiler 40kW

£2311.99

ex. VAT £1926.66 Each

quantity

Ideal Boilers / Ideal Logic Max Combi 2 Boiler 30kW

( 2 )

Product code: 82539

Ideal Logic Max Combi 2 Boiler 30kW

£1692.99

ex. VAT £1410.82 Each

quantity

( 4 )

Product code: 31740

Baxi 800 Combi 2 Boiler 30kW

£1929.99

ex. VAT £1608.32 Each

quantity

Product code: AH982

Worcester Bosch Greenstar 2000 Combi Boiler 30kW

£1161.99

ex. VAT £968.32 Each

quantity

Product code: AH952

Worcester Bosch Greenstar 27i Compact System Boiler 27kW

£1753.49

ex. VAT £1461.24 Each

quantity

Product code: 97148

Ideal Logic Max Combi 2 Boiler 24kW

£1557.99

ex. VAT £1298.32 Each

quantity

Product code: AH998

Worcester Bosch Greenstar 21Ri Boiler ErP+ 21kW

£1430.49

ex. VAT £1192.07 Each

quantity

Baxi / Baxi 600 Combi 2 Boiler Range 24kW

( 1 )

Product code: 45331

Baxi 600 Combi 2 Boiler Range 24kW

£1249.99

ex. VAT £1041.66 Each

quantity

Ideal Boilers / Ideal Vogue Max Combi Boiler 26kW

( 1 )

Product code: 26393

Ideal Vogue Max Combi Boiler 26kW

£1744.99

ex. VAT £1454.16 Each

quantity

( 1 )

Product code: 62654

Baxi 800 Combi 2 Boiler 24kW

£1699.99

ex. VAT £1416.66 Each

quantity

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