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Only the best A-rated energy efficient boilers

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Suitable for kitchen cupboards

Glow-worm Compact C24 24kW glow-worm

Glow-worm Compact

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5-Year Warranty

Hand-built in Derbyshire

Glow-worm's compact boiler

5 year warranty

Fixed price (inc. VAT)

£1,879

£1,979

or, monthly from

£39

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Best value

Alpha E-Tec NX 28kW Alpha E-Tec NX 28kW overlay alpha

Alpha Etec NX

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11-Year Warranty

Ideal for small and medium homes

Stainless steel heat exchanger

Compact stylish design

Fixed price (inc. VAT)

£2,049

or, monthly from

£43

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Budget boiler

Compact

Worcester Bosch 1000 24kW Worcester Bosch 1000 24kW overlay worcester

Worcester Greenstar 1000

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5-Year Warranty

Designed for cupboards

Great design at a lower price

Innovative 'QuickTap' water saving

Fixed price (inc. VAT)

£2,299

or, monthly from

£48

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Which? Best Buy Boiler

Best seller

Worcester Bosch 2000 25kW Worcester Bosch 2000 25kW overlay worcester

Worcester Greenstar 2000

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7-Year Warranty

Worcester's quietest combi boiler

Big brand budget boiler

New sleek compact design

Fixed price (inc. VAT)

£2,249

£2,299

or, monthly from

£47

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Modern new design

Worcester Bosch 4000 25kW Worcester Bosch 4000 25kW overlay worcester

Worcester Greenstar 4000

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10-Year Warranty

Our most popular boiler

Innovative 'QuickTap' water saving

Powerful to meet your needs

Fixed price (inc. VAT)

£2,389

or, monthly from

£50

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Modern but affordable

Viessmann Vitodens 050-W 30kW viessmann

Viessmann 050

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10-Year Warranty

10 year warranty

Compact dimensions & quiet

Fits into kitchen cupboards

Fixed price (inc. VAT)

£2,449

or, monthly from

£51

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Everything you need to know

Find quick answers to our most common questions.

Boiler help & expert guides

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Best Condensing Boilers 2026

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26 February 2026

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Combi Boiler Pipes Explained

Combi Boiler Pipes Explained

Understanding the key components of combi boiler pipework is essential for making informed decisions...

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