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Repair an immersion heater.
Part P notifiable
Element, thermostat or wiring — replaced by a Part P electrician with safety isolation.
✓ Updated Mar 2026✓ Free quotes✓ Vetted pros
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Costs, timelines, pitfalls and the right questions to ask before any electrician starts on immersion heater repair.
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Four moves that separate a smooth job from a nightmare.
The "Limescale Trap"
In hard-water areas, the element becomes coated in scale, causing it to overheat and burn out prematurely.
Seized Elements
Older elements can become physically stuck to the cylinder; forcing them can split the copper tank, leading to an expensive cylinder replacement.
Tripping Electrics
A split element casing allows water to touch the live wire, instantly tripping your RCD or blowing a fuse.
Faulty Thermostats
If your water is dangerously hot or "knocking" is heard in the tank, the thermostat has likely failed in the 'on' position.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Call-out / Diagnostic FeeOften covers the first hour of labour.
£80–£150
Thermostat ReplacementIncludes part and labour; usually a "dry" job.
£90–£160
Heating Element ReplacementIncludes draining the tank and new element.
£180–£350
Dual Element ReplacementCommon in Economy 7 cylinders.
£250–£450
Total Average ProjectInclusive of VAT and standard parts.
£170–£400
!
Quote spread is typically ± 18% — always get 3 quotes.
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This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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