How much does a boiler repair cost?

From £90 for attendance and diagnosis, with the fee fixed in advance. Most repairs land between £150 and £450 fitted once parts are included.

Do I pay the callout if I decide not to repair?

You pay the agreed diagnosis fee for the visit, and you get the fault in writing plus replacement costs, so the money is not wasted if you choose a new boiler.

My boiler is 12 years old and needs a new heat exchanger. Repair it?

Rarely worth it. On a boiler that age the part cost, the labour and the odds of the next failure usually point to replacement with a warranty instead.

Can old boilers still be repaired at all?

Often yes, if spares are still available. Back boilers and pre-2005 models are the ones where parts have thinned out, and the engineer will say at diagnosis whether the part can be sourced.

Boiler repairs in Teesside

Boiler repairs in Teesside start at £90 for attendance and diagnosis, with the fee agreed before the visit and any parts quoted for your approval before they are fitted. Most common faults land between £150 and £450 fitted, and you get a straight answer when a repair is not worth doing.

Get Quote Call 01642 053 927 From £90

Hands tightening steel pipe fittings during a heating repair

A fixed fee to find the fault

The frustrating part of a breakdown is not knowing what the visit will cost. The diagnosis fee here is fixed and stated before an engineer attends, from £90, and it buys a proper diagnosis rather than a guess: fault codes read, gas pressure and flue readings taken, components tested rather than swapped hopefully. If a part is needed, you get the price for the part and the labour before anything is fitted, and you decide.

The faults that come up most

Common Teesside boiler repairs and typical fitted prices (2026)
Symptom	Usual cause	Typical fitted price
Pressure keeps dropping	Expansion vessel or a system leak	£150 to £320
Hot water but no heating	Diverter valve or seized pump	£200 to £420
Lukewarm water at full flow	Scaled plate heat exchanger	£220 to £450
Boiler locks out on ignition	Fan, electrode or gas valve	£180 to £480
No power, no display	PCB or wiring fault	£250 to £500
Frozen condensate in winter	Uninsulated external pipe	£90 to £180

When repairing stops being sensible

An eight year old boiler needing £400 of parts is usually a boiler with more bills queued behind this one. Spares get scarcer, the second fault arrives within a season, and the money would have bought a chunk of a new appliance carrying a fresh warranty. That is not a sales line, it is arithmetic, and the honest version of it belongs in the diagnosis: repair cost, remaining life, and what a replacement would cost, so you can choose with the numbers in front of you.

Symptoms that are the system, not the boiler

Cold radiator bottoms, noisy pumps and repeated pump failures point at sludge rather than the appliance, and the fix is a clean or a power flush with a magnetic filter, not a new boiler. Equally, a boiler that short cycles often has controls or balancing problems behind it. A repair visit should identify which layer the fault actually lives in.

If you smell gas

Do not wait for a booking. Call the National Gas Emergency Service on 0800 111 999, turn the gas off at the meter, open windows and leave electrical switches alone. That call is free and it is the right first step every time.