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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)

£1,979

£2,079

or, monthly from

£41

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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)

£2,149

or, monthly from

£45

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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)

£2,149

or, monthly from

£45

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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)

£2,219

£2,269

or, monthly from

£46

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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)

£2,399

or, monthly from

£50

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Vaillant's best selling boiler

Vaillant EcoFIT Pure 30kW vaillant

Vaillant ecoFIT Pure

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10-Year Warranty

Hand-built in Derbyshire

Quiet operation for minimal noise

Compact cupboard fit solution

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

Back Boiler Replacement Cost in the UK

Back Boiler Replacement Cost in the UK

Back boilers are outdated, inefficient, and pose safety risks. Upgrading to a combi boiler improves...

Stephen Day profile photo

Stephen Day

Gas Safe Engineer

02 April 2026

Guides

Boiler Pressure Too High: What It Means and How to Fix It

Boiler Pressure Too High: What It Means and How to Fix It

High boiler pressure is usually anything above 2.5 bar on the pressure gauge when the heating is on.

Stephen Day profile photo

Stephen Day

Gas Safe Engineer

02 April 2026

Advice

How Much Does a Heat Pump Cost? 2026 Guide

How Much Does a Heat Pump Cost? 2026 Guide

In the UK, a heat pump usually costs several thousand pounds, with most air source systems landing a...

Stephen Day profile photo

Stephen Day

Gas Safe Engineer

27 March 2026

Guides

Ideal F2 Error Code - How to Fix

Ideal F2 Error Code - How to Fix

Ideal F2 usually means flame loss.

Stephen Day profile photo

Stephen Day

Gas Safe Engineer

27 March 2026

Guides

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Installed from £1,985