The short version
- Diagnosis and repair are separate stages, and honest quoting reflects that
- The part, not the labour, is usually what moves the price
- Age and parts availability matter as much as the fault itself
- A repair that costs a large share of a new boiler is rarely good value on an old appliance
What you are actually paying for
A repair bill has a predictable structure once you break it down.
- Attendance and diagnostic time, including testing rather than part swapping
- The replacement part itself, which varies enormously by component
- Labour to fit, which depends on how buried the component is
- Re-commissioning, gas soundness and combustion checks afterwards
Cheap parts and expensive parts
At the cheap end sit thermistors, pressure sensors, auto air vents and valve heads. In the middle sit pumps, fans, diverter valve cartridges and expansion vessels. At the top sit gas valves, PCBs and heat exchangers, and on some appliances a heat exchanger approaches the point where replacement makes more sense than repair.
What pushes a price up
Access is the hidden cost. A boiler in an accessible cupboard is a different job from one boxed into a loft with a ladder and no working room. Discontinued parts add sourcing time, and a system full of sludge can mean the repair is pointless without cleaning it too.
- Restricted access, loft installs and boxed in appliances
- Discontinued or slow moving parts
- Related faults found during testing, such as a failed vessel behind a leaking valve
- Systems needing cleaning before a repair will hold
When to stop repairing
There is no fixed rule, but three things together usually settle it: the appliance is past a decade, the failed part is a major one, and the system has other faults queued behind it. At that point the money is better spent on a new installation with a fresh guarantee than on keeping an old unit alive one part at a time.
How we quote
We diagnose first, tell you what has failed, and give you the cost before any work starts. If we think replacement is the better value option we will say so plainly, including when that means we do not do the repair.
Common questions
Why will nobody quote a repair over the phone?+
Because the same symptom has many possible causes. A no heat call can be a thermostat battery or a gas valve, and quoting blind either overcharges you or leads to a revised price on the day.
Do you charge for diagnosis if I go ahead?+
Tell us what the boiler is doing when you call and we will explain how the visit is charged before we attend, so there are no surprises.
Is a repair worth it on a ten year old boiler?+
Sometimes. It depends which part has failed and what condition the rest of the system is in. We will give you an honest view rather than automatically pushing a replacement.
Will my warranty cover the repair?+
If the appliance is in warranty and has been serviced annually, often yes. Check your service records first, because a missed service is the usual reason a claim is refused.
Can a repair be done the same day?+
Frequently, because common parts are carried on the van. Less common components may need ordering.
Boiler down and want a straight answer?
Tell us the make, model and what it is doing, and we will explain how the visit works before we come out.