Plumbing · Croydon, London
Emergency Boiler Repair in Croydon, London
A boiler that lights, clicks and gives up, or one that has gone dark on the coldest night, is a household problem rather than a technical one. [Proper Plumber Croydon](/) answers on 07898 116196 at any hour and matches the independently owned partner company that suits your boiler and can reach you soonest.
Doing it right means the fault is named before the price is. Published London figures show how repairs stack up: a reset or minor fault £80 to £150, a valve or thermostat £120 to £220, a pump £150 to £280, a circuit board £200 to £450 and a heat exchanger £350 to £650. Emergency call-outs by time of day run from £120 to £220 on a weekday evening up to £200 to £350 and more overnight. The partner company confirms its own price in writing first.
Croydon East tap water measured 308 mg/l as calcium carbonate in 2025, which is very hard. That is the standing background to boiler calls here: scale narrows heat exchangers, clogs diverter valves and strains pumps, so a combi that ran quietly all autumn starts to bang, cut out or lose hot water when demand peaks in the first cold week.
If you can smell gas, stop reading and leave the property. Ring the National Gas Emergency line on 0800 111 999. Our work on gas appliances is built to the Gas Safety (Installation and Use) Regulations 1998 and the manufacturer's instructions, and we never pretend a gas fault is a plumbing one.
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What We Do
Boiler Faults We Match You To
Most call-outs fall into three groups, each with its own cost curve.
No Heating or Hot Water
A boiler that fires but gives no hot water often has a failed diverter valve, a scaled plate heat exchanger or a pressure problem. The partner company runs through the controls first, then tests the components. Valve and thermostat swaps cluster around £120 to £220, pumps £150 to £280.
Lockouts, Noises and Pressure Drops
Banging is usually scale or a trapped air pocket, a pressure drop usually a leak somewhere in the system, and a lockout a safety device doing its job. Fixing the cause matters more than resetting the boiler. See leak detection & repair when pressure keeps falling.
Repair or Replace?
A circuit board at £200 to £450 or a heat exchanger at £350 to £650 on an ageing boiler may cost more than it is worth. The partner company says so honestly, with a written comparison, and the boiler installation & replacement page covers the other route.
The Benefits
How a Boiler Repair Is Run
Diagnosis before parts, parts before invoices.
Symptoms, Then Controls
The partner company asks what the boiler does and does not do, checks pressure, the programmer and thermostats, and reads any fault code before taking anything apart.
Test the Part, Not the Guess
A failed component is confirmed by testing, not assumption. You are told what has failed, why, and what the part and labour cost, in writing.
Flush If the System Needs It
Where black sludge or scale is the cause, a system flush to BS 7593 stops it recurring. The partner company quotes that separately so you can choose.
Good to Know
Before the Engineer Arrives
Quick, safe checks that sometimes save a visit.
Safe Checks You Can Make
None of these involve opening the boiler.
- Check the pressure gauge sits between about 1 and 1.5 bar
- Confirm the programmer and thermostat are calling for heat
- Make sure the gas meter has credit or the supply is on
- Look for a fault code on the display and note it
- Check the condensate pipe has not frozen outside in winter
Do Not Do These
Each of these makes a repair longer or riskier.
- Do not remove the boiler casing yourself
- Do not keep resetting a boiler that locks out
- Do not top up a pressure that keeps dropping
- Do not ignore a smell of gas; ring 0800 111 999
- Do not block the flue or the ventilation grille
Why Us
Boilers in Victorian Terraces and Flat Blocks
Where the boiler lives changes what goes wrong.
Addiscombe: Conservation Rules
Inside the East India Estate Conservation Area, changes to external flues carry extra planning control. A repair is rarely affected, but a relocated flue may be, and the partner company flags it early.
East Croydon: Sealed Combis
Newer flats around Cherry Orchard Road usually have sealed-system combis and shared risers. Pressure loss is a frequent fault, and a leak in the flat above can be the cause.
Shirley: Interwar Systems
1930s semis often have boilers upgraded to combis over time, alongside older copper pipework, airing-cupboard cylinders and loft tanks. Mixed-age systems need a full look, not a single swap.
Heating faults overlap with other emergencies. If a pipe has split, start with burst pipe repair; for a broader failure see emergency plumbing. All our services are listed in one place.
What Boiler Repair Covers
Boiler repair means diagnosing and fixing a fault in an existing gas or electric boiler, rather than replacing it. Faults range from a tripped control to a failed heat exchanger, and the right answer depends on the age of the boiler as much as the fault.
Efficiency rules under Building Regulations Part L apply to replacement boilers, and any gas appliance work follows the Gas Safety (Installation and Use) Regulations 1998 and the manufacturer's instructions.
What Moves the Price
The Fault
Resets and thermostat swaps sit at the bottom of the published ranges, and a circuit board or heat exchanger at the top. The part itself, availability and the time to fit it all count.
The Hour
The same repair at 11pm on a bank holiday is priced differently from one at 2pm on a Tuesday. We say so on the call and the partner company puts it in writing.
When Hard Water Is the Real Culprit
Many boiler complaints in CR0 and SE25 trace back to scale. A combi that delivers lukewarm water, a radiator circuit that warms slowly and a pump that sounds strained can all point the same way. The partner company checks the plate heat exchanger and the filter before ordering expensive parts, because a descale is cheaper than a new component.
Looking After the Boiler Afterwards
Bleed radiators, check the pressure monthly, keep the area around the boiler clear and book an annual service. If a fault returns, quote the date and what was done and ring us on the same number, so the matter goes back to the partner company that did the job.
Boilers in Flats: Who to Tell
In a managed block, a boiler flue often passes through a communal wall or roof, and a flue fault can involve the freeholder. The partner company tells you when a repair touches shared parts and what to pass on to the managing agent, so a simple boiler visit does not become a dispute about access.
Landlords and Tenants
If you rent, tell your landlord straight away: a heating failure is usually theirs to arrange. If they ask us to help, the partner company quotes to them, and we keep the details of the visit in one place so both of you can see what was found and what was done.
What We Will Not Do on the Phone
We will not diagnose a gas fault by guesswork, promise an arrival time we cannot keep or tell you a repair is certain before it has been looked at. What we will do is ask the right questions, match the partner company, text you its name and stay on the line while you check the safe things listed above.
Frequently Asked Questions
How much does emergency boiler repair cost in Croydon?
Published London figures put a minor fault or reset at £80 to £150, a valve or thermostat at £120 to £220, a pump at £150 to £280, a circuit board at £200 to £450 and a heat exchanger at £350 to £650. Time of day adds to the call-out: weekday evening £120 to £220, weekend £150 to £280 and overnight £200 to £350 or more. The partner company quotes its own price in writing.
Is it cheaper to wait until morning for a boiler repair?
Usually yes. Published London guides show overnight and bank holiday call-outs at the top of the range, while a weekday daytime visit sits lower. If you have a safe alternative source of heat and nobody vulnerable in the house, waiting can save money. If you have a baby, an elderly relative or someone ill, warmth matters more than the premium, and the partner will tell you the cost up front.
Why does hard water make boilers fail?
Croydon East water measured 308 mg/l as calcium carbonate in 2025, which is classed as very hard. When heated, that calcium comes out of solution as scale, which narrows the plate heat exchanger in a combi, jams diverter valves and strains pumps. Scale reduces hot water flow and causes banging. A scale reducer or periodic descale helps, and the partner company can advise on what suits your boiler.
My boiler keeps losing pressure. What is wrong?
Falling pressure means water is going somewhere. The commonest causes are a weeping radiator valve, a leaking pressure relief valve, a failed expansion vessel or a small pipe leak you cannot see. Topping up by hand only hides the problem and draws in more scale. The partner company tests each possibility in turn and quotes the cure, which is often a modest repair.
Can I smell gas and still have the boiler looked at?
Not until the gas is dealt with. If you smell gas, open doors and windows, leave the building, avoid switches and flames, and ring the National Gas Emergency line on 0800 111 999. Once the supply is declared safe, ring us for the heating fault. Gas work is built to the Gas Safety (Installation and Use) Regulations 1998.
How do I know if my boiler is worth repairing?
Look at the fault, the part cost and the system around it. A pump or valve is cheap against a replacement, whereas a heat exchanger at £350 to £650 on a tired boiler is a harder decision. The partner company gives you a written comparison so you can see both routes. If replacement wins, see our central heating repair page for the rest of the circuit and the installation page for new boilers.
What does a system flush involve and is it worth it?
A flush cleans sludge and scale out of radiators and pipework, using a chemical cleanser and a powered pump to circulate it. Work is carried out to BS 7593, which sets out cleansing and inhibitor use. It is worth it when cold spots, black water or repeated pump and valve failures point to sludge, and the partner company quotes it separately from the repair.
Do boilers need more maintenance in hard water areas?
They benefit from it. An annual service, published in London guides at £70 to £120, lets someone check pressures, clean the burner and look for early scale. A scale-reducing device or inhibitor can slow the build-up. A service is not a repair, so ask the partner company to tell you if it finds anything that needs a follow-up visit.
Will you tell me the partner company before anyone arrives?
Yes. We text you the partner company's name before anyone comes, so you know who is at the door. It quotes in writing, does the work, invoices and takes payment directly, and we handle no money. If something is wrong afterwards, ring us and we chase it. Our How We Work page sets it out in full.
Do you cover boiler repairs in Woodside and South Norwood?
Yes. We cover Croydon, Addiscombe, South Norwood, Shirley, East Croydon and Woodside, matching the nearest partner company that suits your boiler. Victorian terraces in South Norwood and Addiscombe have their own pipework quirks. Ring 07898 116196 and give us your postcode, the boiler make and the fault code if there is one, so the right partner company is matched first time.
