Heat-Only Boiler Cost UK 2026

A heat-only (also known as "regular" or "conventional") boiler replacement in 2026 costs £2,300–£3,500. Mostly used in older UK homes with existing tank-in-loft systems.

Quick answer

Typical UK price range: £2,300–£4,500. Typical time: 1–2 days.

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Boiler replacement calculator

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Boiler type Combi (like-for-like) System boiler Heat-only / conventional Combi with move

Region London South East South West Midlands North of England Scotland Wales Northern Ireland

Specification level Basic / standard Mid-range Premium / high-end

Extras

System power flush £350–£700 Magnetic filter £100–£200 Smart thermostat £200–£400 New TRVs (all rads) £250–£600 Flue extension £150–£350

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Estimate only. Prices reflect 2026 UK market data — get quotes from local tradespeople for accurate pricing.

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Budget Under £5,000 £5,000 – £15,000 £15,000 – £30,000 £30,000 – £60,000 £60,000+ Not sure

Timeline As soon as possible 1 – 3 months 3 – 6 months 6+ months Just researching

Project details

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Key points

• £2,300–£3,500 fitted
• Needs loft cold water tank + hot water cylinder
• Lower mains pressure required
• Good choice for replacing existing system without re-piping

Cost breakdown

Item	Low	High
Heat-only boiler	£1,000	£2,000
Install labour	£600	£1,100
Power flush	£350	£700

Cost by UK region

Region	Typical cost
London	£4,590
South East	£4,250
South West	£3,740
Midlands	£3,400
North England	£3,060
Scotland	£3,230
Wales	£3,060

How to save money

• Replace cold-water tank if it's plastic and over 20 years
• Insulate the hot water cylinder if not already
• Consider converting to system or combi long-term

How to find a trusted tradesperson

Get at least 3 quotes from vetted UK trade networks:

• Checkatrade
• MyBuilder
• Bark

FAQs

Why choose heat-only over combi?

Heat-only works on weaker mains pressure (rural areas) and is cheapest if you’re keeping existing piping/tanks.

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Disclaimer: Prices are guide ranges based on 2026 UK market data. Get quotes from local tradespeople for accurate pricing.