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25kW Combi Boilers

A 25kW combi boiler provides reliable central heating and instant hot water, making it ideal for smaller homes or flats. Compact and efficient, it fits neatly into your space while delivering consistent warmth and water pressure whenever you need it.

Designed for modern living, these boilers maximise energy efficiency to help lower your bills and reduce environmental impact. With smart controls, modulating burners, and easy maintenance, a 25kW combi boiler offers lasting performance, comfort, and peace of mind — the perfect heating solution for everyday use.

 
 
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15 results
worcester-greenstar-4000-25kw-combination-boiler-natural-gas

Worcester Bosch Greenstar 4000 25kW Combi Gas Boiler - 7733600371

More Options Available
Worcester
£1,256.20 inc
VAT
✓ 214 In Stock
main-eco-compact-25kw-natural-gas-combination-boiler-erp

Main Eco Compact 25kW Natural Gas Combination Boiler ErP - 7714519

Main
£718.47 inc
VAT
✓ 2,505 In Stock
warmflow-agentis-21-27kw-professional-external-combination-oil-boiler

Warmflow Agentis 21-27kW Professional External Combination Oil Boiler - E26CPRO

More Options Available
Warmflow
£3,564.56 inc
VAT
✓ In Stock
warmflow-agentis-21-27kw-external-combination-oil-boiler

Warmflow Agentis 21-27kW External Combination Oil Boiler - E26C

More Options Available
Warmflow
£3,160.45 inc
VAT
✓ In Stock
warmflow-agentis-21-27kw-combination-oil-boiler

Warmflow Agentis 21-27kW Combination Internal Oil Boiler - I26C

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Warmflow
£3,201.56 inc
VAT
✓ In Stock
warmflow-agentis-professional-21-27kw-combination-oil-boiler

Warmflow Agentis Professional 21-27kW Combination Internal Oil Boiler - I26CPRO

More Options Available
Warmflow
£3,439.79 inc
VAT
✓ In Stock
glow-worm-energy-25kw-combination-boiler-natural-gas-erp

Glow-worm Energy 25kW Combination Boiler Natural Gas ErP - 0010035896

Glow-worm
£1,016.01 inc
VAT
✓ 16 In Stock
worcester-greenstar-heatslave-ii-1825-combination-boiler-oil-erp

Worcester Bosch Greenstar Heatslave II 18/25kW ErP Combi Oil Boiler - 7731600261

Worcester
£3,484.09 inc
VAT
✓ 34 In Stock
worcester-greenstar-heatslave-ii-1825-external-combination-boiler-oil-erp

Worcester Bosch Greenstar Heatslave II 18/25kW ErP External Combi Oil Boiler - 7731600264

Worcester
£3,756.61 inc
VAT
✓ 9 In Stock
vaillant-ecofit-pure-825-combination-boiler-natural-gas-erp

Vaillant ecoFIT pure 825 25kW Combination Boiler Natural Gas ErP - 0010020389

Vaillant
£1,361.02 inc
VAT
✓ 95 In Stock
viessmann-111-w-b1lf-25kw-storage-boiler-with-integrated-cylinder

Viessmann 111-W B1LF 25kW Storage Boiler With Integrated Cylinder - 7228598

Viessmann
£2,070.04 inc
VAT
✓ In Stock
worcester-bosch-greenstar-2000-25kw-combi-gas-boiler-7736902326

Worcester Bosch Greenstar 2000 25kW Combi Gas Boiler - 7736902326

Worcester
£936.77 inc
VAT
✓ 14 In Stock
viessmann-vitodens-050-w-b0ka-gas-combi-boiler-25kw

Viessmann Vitodens 050-W B0KA Gas Combi Boiler 25kW - 7098601

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Viessmann
£1,087.51 inc
VAT
✓ 5 In Stock
glow-worm-energy-25kw-gas-combi-boiler-horizontal-flue-0010040024

Glow-worm Energy 25kW Gas Combi Boiler - Horizontal Flue 0010040024

Glow-worm
£1,418.46 inc
VAT
✗ Extended Lead Time, 2 Weeks+
viessmann-vitodens-222-f-b2th-gas-storage-combi-boiler-25kw

Viessmann Vitodens 222-F B2TH Gas Storage Combi Boiler 25kW - Z030451

More Options Available
Viessmann
£3,538.98 inc
VAT
✗ Extended Lead Time, 2 Weeks+