Plumbing · Tooting, London
Central Heating Repair in Tooting, London
Half the radiators in the house are warm and the other half are stubbornly cold. That is the usual shape of a central heating fault, and it rarely means the whole system is finished. [Honest Plumber Tooting](/) answers on 07861 936716 at any hour and sends the nearest independently owned partner company that suits the fault, whether the house is a Heaver Estate terrace or a flat above Tooting Broadway.
Here is the candid version of what usually goes wrong. Thames Water supply in the Tooting area is classed as hard, at 262 mg/l of calcium carbonate, and over time that scale and the black sludge it travels with settle at the bottom of radiators and in the pump. A cold patch at the base of a radiator is the classic sign, and it is often fixed by cleaning, not by buying new kit.
Before anyone lifts a spanner, the partner company works down a short list: is the boiler firing, is the pump turning, are the zone valves opening, are the radiators bleeding clear. Published London prices put a pump replacement at about £150 to £280 and a radiator swap at £110 to £350, and the partner confirms the figure in writing before starting.
Not every fault is worth repairing, and you will be told so. A system that has leaked three times in a winter, or a boiler near the end of its life, can cost more to patch than to rethink. You decide with the numbers in front of you, and the conversation stays honest.
Emergency line · Open 24 Hours
Tap to call now07861 936716A real person answers, day or night. Prefer a callback?
What We Can Help With
Heating Faults We Send Someone To
Most heating calls come down to one of three things: water not moving, water not reaching, or water not heating.
Cold Radiators and Cold Spots
A radiator that is cold at the bottom has sludge, and one cold at the top has trapped air. The partner company bleeds, balances and, where needed, removes and flushes a single radiator without draining the whole system. Stuck radiator valves, a common failure in Victorian conversions, are swapped at the same visit.
Pumps, Valves and Controls
If the boiler fires but nothing circulates, the pump or a motorised valve is the usual suspect. Thermostats, programmers and zone valves fail quietly and are often the cheapest fix on the list. Published London ranges put a pump swap at £150 to £280.
Leaks and Pressure Loss
A boiler that keeps losing pressure is leaking somewhere, even if the floor is dry. Pinhole leaks hide under boards in terraces, and tracing one can mean a pressure test or a camera. Our leak detection page covers how the hunt works.
Benefits for You
How a Heating Repair Is Run
A fixed order of checks saves paying for parts you did not need.
Check the Simple Things First
Pressure, thermostat settings, timer and a bleed of the radiators come before any part is ordered. Plenty of faults end right there, with air in a radiator or a valve that has stuck.
Quote Before the Spanner Turns
Once the fault is located, the partner company writes the price down: parts, labour and any call-out. You say yes or no before work begins.
Test the Whole Circuit
After the repair, every radiator is checked for heat, the pump and valves are watched through a cycle, and the boiler is confirmed to be firing on demand.
Tips & Advice
Is My Heating Telling Me Something?
The symptoms point to the cause.
Signs of Sludge and Scale
These suggest the water is carrying debris.
- Radiators cold at the bottom and hot at the top
- Boiler making kettling or banging noises
- Black or brown water when a radiator is bled
- Some rooms warming slowly while others overheat
- A pump that hums but does not circulate
Check Before You Call
Two minutes that sometimes save a visit.
- Look at the boiler pressure gauge (usually 1 to 1.5 bar)
- Check the thermostat has fresh batteries
- Confirm the programmer is on and the day is right
- Open each radiator valve fully
- Bleed a radiator and note whether air or water comes out
Why Use Us
Heating Repair Across SW17 and SW12
Houses here were built before central heating existed, and it shows.
Heaver Estate and Bec Terraces
Alfred Heaver's Queen Anne houses (c.1890-1910) were fitted with heating decades later, so pipes run through awkward voids. Article 4 Directions in the conservation area also limit what can change externally, which matters for flues.
Du Cane Court and Mansion Blocks
In a large Balham block such as Du Cane Court, shared risers and sometimes communal heating mean the first question is whose system it is. The partner company checks before any work starts, so you are not paying to fix the freeholder's pipe.
Furzedown's Edwardian Houses
Streets laid out between 1900 and 1930 usually have a combi boiler and a ring of radiators added later, often with one overworked loop. Balancing, not replacing, is often the answer.
If the heating failure is one part of a bigger problem, see emergency plumbing and burst pipe repair. A system that needs cleaning end to end is covered on power flushing, and a dead boiler on emergency boiler repair. Browse every service.
What Is Central Heating Repair?
Central heating repair is diagnosing and fixing the parts that move heat around a house: the pump, the valves, the controls, the pipework and the radiators. The boiler makes the heat, but about as many faults live in the circuit around it. A warm boiler and cold rooms is a circuit problem, and it is fixed at the circuit.
In Tooting the circuit is usually older than the boiler. Many terraces were piped for radiators long after they were built, and the pipework passes through floor voids, cupboards and shared walls. That is why a hidden leak or a stuck valve can take longer to find than to mend.
What Affects the Price of Heating Repair
Which Part Has Failed
A thermostat or valve is the cheap end, at published London ranges of £80 to £220. A pump replacement runs £150 to £280, a circuit board £200 to £450, and a heat exchanger £350 to £650. The partner company tells you which category you are in before anything is ordered.
Access and Time of Day
Pipes behind fitted units or under boards add labour, and an overnight call-out costs more than a weekday visit. Ask for both numbers if the repair can wait until morning, and the partner will give you a straight answer on whether it can.
When a Repair Is Not the Answer
A Boiler Near the End
If the boiler is the oldest thing in the system and the fault is inside it, ask for the repair figure and the replacement figure side by side. A combi fitted new is published in London at £2,000 to £3,500, so a £450 board on a tired boiler is a real decision.
A System Nobody Has Touched in Ages
Where radiators were never balanced and the water has never been treated, a repair can be a short reprieve. The partner company will suggest the cheaper fixes first and say plainly when they will not hold.
Your Questions Answered
Why are my radiators cold at the bottom but hot at the top?
That pattern almost always points to sludge, a mix of rust and scale that settles at the base of the radiator and blocks the flow. Tooting's hard water, at 262 mg/l of calcium carbonate, makes scale a background cause in many local systems. The partner company can often clear a single radiator by removing and flushing it, and a whole-system clean is covered on our power flushing page.
How much does central heating repair cost in Tooting?
There is no Tooting-specific price list, so these are published London ranges rather than quotes from us. A heating pump replacement runs at about £150 to £280, a radiator replacement at £110 to £350, and a minor fault such as a thermostat or valve at roughly £80 to £220. The partner company that attends gives you the figure in writing after finding the fault, before any work begins.
My boiler is on but the radiators stay cold. What is wrong?
When the boiler fires but nothing warms, the water is not moving. The usual causes are a failed pump, a motorised valve stuck shut, or a blocked radiator circuit. Check that the pressure gauge reads about 1 bar and that the thermostat is calling for heat, and if both are fine, ring the line. For faults inside the boiler itself, see emergency boiler repair.
Why does my boiler keep losing pressure?
A sealed heating system should hold steady pressure for months, so repeated drops mean water is escaping or the expansion vessel has failed. Leaks can hide under floorboards or behind plaster, particularly in Victorian terraces. The partner company pressure-tests the system to find the source, and a hidden central heating leak survey is published at about £250 to £700 across London.
Is it worth repairing an old heating system or should I replace it?
It depends on what has failed and how often. A single pump or valve is usually worth repairing, but a system leaking repeatedly, or a boiler that needs a major part, may cost more to patch than it saves. A combi boiler fitted and supplied is published at £2,000 to £3,500 in London. The partner company will say plainly when a repair is poor value, and the choice is always yours.
Do I need a power flush every time radiators go cold?
No, and you should be wary of anyone who says otherwise. A single cold radiator can often be fixed by bleeding or removing and flushing it alone, which costs far less than treating the whole system. A full power flush makes sense when several radiators are cold at the bottom, the water runs black and the pump is struggling. The partner company recommends the smaller job first where it will work.
Why is my heating making banging or kettling noises?
Banging and kettling usually mean scale or sludge has coated the boiler's heat exchanger, so water boils in pockets instead of flowing smoothly. In a hard-water area such as Tooting the problem builds slowly and gets worse each winter. It is worth fixing early, because a blocked heat exchanger is among the dearer boiler repairs, at £350 to £650 in published London ranges.
I live in a flat at Du Cane Court or a similar block. Who fixes the heating?
It depends on the building. Some mansion blocks have communal heating run by the freeholder or managing agent, in which case the fault is theirs to fix and you report it to them. Others have individual boilers on shared risers, where the part inside your flat is yours. The partner company checks the arrangement before any work, so you are not paying for something that belongs to the building.
Can you fix heating at night or on a bank holiday?
Yes, the line on 07861 936716 is answered 24 hours, and the nearest partner company that suits the fault is sent. Out-of-hours boiler repairs are published in London at about £120 to £220 on a weekday evening, £150 to £280 at weekends and £200 to £350 or more overnight. Those are published ranges, and the partner confirms the actual figure in writing before starting.
What standards does the work follow?
Heating repairs are carried out to the manufacturer's instructions and to Building Regulations Part L for boiler efficiency, and any gas-related work follows the Gas Safety (Installation and Use) Regulations 1998. Water fittings used should be WRAS-approved under the Water Supply (Water Fittings) Regulations 1999. If you ever smell gas, leave the property and ring the National Gas Emergency number, 0800 111 999.
Will a radiator valve or thermostat fix be a big job?
Usually not. Replacing a thermostatic radiator valve or a room thermostat is among the quicker heating jobs, and many are done in a single visit with the system drained down only partly. Published London ranges put minor faults at about £80 to £220. The partner company writes the price down first, and a stuck valve found during another repair is mentioned before it is touched.
Who actually does the repair, and who do I pay?
The repair is done by an independently owned local plumbing company in our partner network, matched to the fault and to who can reach you soonest. We text you the company's name before anyone arrives. The partner quotes, invoices and takes payment directly, and we handle no money; if anything goes wrong afterwards, ring us and we chase it. Details are on our How We Work page.
