Berkshire + selected London areas

Unvented hot-water cylinder service & repair

Unvented cylinders provide mains-pressure hot water and contain safety controls that must be treated correctly. We inspect the hot-water system, electrical immersions and relevant safety components before recommending repair.

✓ Dimplex certified installer✓ NICEIC registered electrical work✓ G3 unvented qualified✓ Electrical + heating diagnosis

Common reasons customers call

Discharge pipe dripping
No hot water
Poor hot-water pressure
Immersion not heating
Expansion issue
Thermostat or control fault

What we check before recommending parts

Electric heating faults can be upstream of the appliance. We test in a logical order and keep repair versus replacement as a decision made after evidence, not before.

Temperature and pressure controls
Expansion provision
Immersion heaters and thermostats
Electrical supply and isolation
Visible discharge behaviour
Cylinder and valve condition

Where this service is useful

Megaflo installations
Flats
Houses
Electric boiler systems
Landlord properties
Replacement projects

Brands and systems

Heatrae Sadia MegafloJouleOSOGledhillTelfordKingspan / AlbionSantonStrom

Berkshire and London coverage

We cover Reading, Maidenhead, Windsor, Slough, Bracknell, Wokingham and surrounding Berkshire areas, plus planned visits in West and Central London including Ealing, Hillingdon, Hammersmith & Fulham, Kensington & Chelsea, Westminster, Richmond and Kingston.

Frequently asked questions

What does G3 mean?

G3 refers to the competence requirements associated with installing and servicing unvented hot-water storage systems in England and Wales.

Can you change an immersion on an unvented cylinder?

Yes, where appropriate, with the cylinder isolated, tested and handled in accordance with the system requirements.

Do you service Megaflo cylinders?

Yes. We work on Megaflo and other common unvented cylinder brands.

Related services

Technically reviewed by Berkshire Electric Heating

Reviewed 9 September 2026 · NICEIC-registered electrical work · G3 unvented hot-water qualified · Dimplex Pro / Quantum installer training.

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Send the model, fault and postcode.

A clear photo of the appliance label, controls and consumer unit helps us prepare before the visit.

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