Immersion Heater Repair London
Often searched for as an “immersion boiler,” what most people mean is the immersion heater, the electric heating element fitted inside a hot water cylinder that heats your water directly, either as your main method of heating water or as a backup to a gas boiler or heat pump system. When it stops working, no hot water, water that’s lukewarm rather than hot, or a tripping circuit whenever it’s switched on, it’s usually one of a small number of specific faults. First Strike Electrical Ltd has repaired immersion heaters across London properties since 1999, and as an NICEIC approved contractor, we diagnose the actual cause before replacing anything.
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- NICEIC Approved
- Trading Since 1999
- Parts, Not Whole Units
Common Immersion Heater Faults
- A failed heating element, usually showing as no hot water at all despite the switch being on
- A faulty thermostat, which can mean water that’s never properly hot, or in some cases dangerously overheating
- A tripping circuit or blown fuse specifically linked to the immersion circuit
- A failed or stuck switch or indicator light that makes it hard to tell whether the unit is actually working
How We Diagnose the Fault
We test the element, thermostat and circuit separately rather than assuming which part has failed. An element that’s failed needs replacing; a full immersion heater rarely needs replacing as a whole unit if the underlying element and thermostat are otherwise sound. Where the circuit itself is tripping, we check whether that’s due to the immersion heater or a fault elsewhere on the same circuit, since these can look identical from the switch alone.
A Safety Note
An immersion heater that’s tripping repeatedly, especially combined with a burning smell or a switch that’s warm to the touch, shouldn’t be reset repeatedly and left. Switch it off at the circuit if it’s safe to do so and get it checked before using it again.
Immersion Heaters as a Backup to Gas or Heat Pump Systems
Many properties keep the immersion heater as a backup to a gas boiler or heat pump, used rarely enough that a fault can go unnoticed for a long time, right up until the main heating system fails and you discover the backup doesn’t work either. If you’re not sure when yours was last used or tested, it’s worth checking occasionally rather than assuming it’ll work when you actually need it.
Why Choose First Strike Electrical
NICEIC approved, so our diagnostic and repair work is assessed against national electrical standards, and trading in London since 1999, we’ve dealt with immersion heaters of every age and type, including older cylinders where sourcing the right replacement element takes a bit more knowledge than a modern, standardised unit.
Frequently Asked Questions
My immersion heater isn’t heating water at all, what’s usually the cause?
Most commonly a failed heating element, though a faulty thermostat or a tripped circuit can produce similar symptoms. We test each separately to confirm the actual cause.
Is it safe to keep resetting a tripping immersion circuit?
No, repeatedly resetting a circuit that keeps tripping risks masking a genuine fault. Switch it off and have it checked instead.
Do you need to replace the whole immersion heater, or just a part?
Usually just the failed part, most often the element or thermostat, rather than the entire unit, assuming the rest of it is in reasonable condition.
Can you also check the wider circuit, not just the immersion heater itself?
Yes, since a tripping circuit isn’t always caused by the immersion heater itself, we check the circuit as part of the diagnosis.
My immersion heater is just a backup I rarely use, is it worth checking it works?
Yes, a backup heater that’s never tested can fail silently for years, only to be discovered not working when your main heating system fails and you actually need it.
Related Electrical Services
We work across central, west, north west and south west London — see every area we cover.
Get an Immersion Heater Repaired
Describe the fault when you call, no hot water, tripping, or a specific smell or noise, and we’ll advise on next steps.
NICEIC approved, trading since 1999.
First Strike Electrical Ltd