Great work
9/10
Great work by Chris and punctual too
Name not givenSW12Emergency Central Heating Repair
Fixed prices · Gas Safe registered
Central Heating Repairs and Upgrades in South London
Cold radiators, rooms that never warm up, a thermostat that does nothing, or a system that bangs and gurgles: these are central heating faults rather than boiler faults, and they need someone who looks at the whole system. InstaGasWorks repairs and upgrades central heating across South London as a Gas Safe registered engineer, with the price agreed before any work starts.
This page covers the radiators, valves, pump and controls around the boiler. If the boiler itself has stopped, the boiler repair page is the place to start, and if radiators are cold at the bottom because of sludge, a powerflush is usually the fix.
Gas Safe registeredRated 5.0 on GooglePrices agreed up front
Central Heating prices
Radiator not heating / cold radiators
From £120
- TRVs checked
- Radiators bled
- System balanced
- Pump inspected
Controls & thermostats
From £120
Install and upgrade heating controls and thermostats. The control itself is included.
Radiator fitting (labour only)
From £150 per radiator
Fitting a radiator you supply in place of an existing one. A radiator in a new position is quoted after a look.
- Old radiator drained and removed
- Your radiator hung and connected
- System refilled and bled
- Tested and balanced
Thermostatic radiator valves (TRVs)
£45 to £75 per radiator
Old valves swapped for thermostatic ones so each room can be set on its own. The price depends on the valve chosen.
Magnetic filter
£295
Supplied and fitted on the heating return pipe, catching sludge before it reaches the boiler. Already included with every powerflush and new boiler.
Powerflush
£499
For sludged systems and radiators cold at the bottom: up to 6 radiators, chemicals and a magnetic filter included. Larger systems are priced on the powerflush page.
Parts such as valves, pumps and radiators are quoted before they are fitted, and new or extended heating systems get a free survey and a written quote.
Labour rates for heating faults
| When | First hour | Then, per hour |
|---|---|---|
| Monday to Friday, 8am to 6pm | £120 | £100 |
| Saturday, 8am to 6pm | £160 | £130 |
| Monday to Saturday, 6pm to 9pm | £180 | £150 |
| Sundays and bank holidays | £220 | £170 |
Fault-finding and repairs not on the price list are charged by the hour: the first hour, then 30-minute blocks at the rate for when the work is done. Evening visits are arranged by phone.
Heating problems covered
Radiators cold at the top
Usually trapped air. Bleeding the radiator releases it, and the system pressure is checked afterwards so the boiler is not left too low.
Radiators cold at the bottom
A sign of sludge settling in the radiator. Flushing the radiator or the whole system clears it; a powerflush also includes a magnetic filter to help keep it clear.
Hard water and your boilerOne room never warms up
Often an unbalanced system, where the radiators nearest the boiler take most of the heat. Balancing the radiator valves spreads it evenly.
Thermostat or timer not working
Controls fail, lose their wiring or were never set up properly. They are tested and repaired, or replaced with modern controls.
Weather and load compensation explainedNoisy pipes or a struggling pump
Gurgling, banging or a pump that hums but moves no heat. Air, sludge or a failing pump are the usual causes, found and quoted on the visit.
New radiators and bigger systems
Swapping tired radiators, adding one to a new room or extending the system. Small jobs are priced up front; larger ones get a free survey and a written quote.
How a heating repair works
Step 1
Tell the engineer what is happening
Which radiators are cold, when it started and whether the boiler shows a fault code. It helps the visit start in the right place.
Step 2
The system is checked as a whole
Radiators, valves, pump, pressure and controls are checked together, because a heating fault often shows up a long way from its cause.
Step 3
A price before any work
You are told what is wrong and what it costs to put right, with any parts quoted, before anything is changed.
Step 4
Fixed, balanced and tested
The repair is made, the system is bled and balanced, and every radiator is checked for heat before the engineer leaves.
Reviews for this work
Left on Checkatrade by customers after this kind of job, shown as written. All reviews
Central Heating questions, answered
Why is my radiator cold at the bottom but warm at the top?
That usually means sludge has settled in the bottom of the radiator and is blocking the flow. Bleeding will not help, because the problem is debris rather than air. Flushing the radiator or the whole system clears it, and a powerflush includes a magnetic filter to help keep the system clean afterwards.
Why is my radiator cold at the top?
Trapped air is the usual cause. With the heating off and the radiator cool, bleeding it with a radiator key lets the air out. Check the boiler pressure gauge afterwards, as bleeding lowers the pressure and the boiler may need topping up. If a radiator needs bleeding every few weeks, there is a reason air keeps getting in, and it is worth having it looked at.
How much does a central heating engineer cost?
Common jobs have published prices: a cold radiator visit from £120, controls from £120 with the control included, a radiator you supply fitted from £150, TRVs from £45 a radiator and a magnetic filter for £295. Fault-finding beyond that is charged by the hour at the published labour rates, and parts are quoted before they are fitted.
Is this the same as a boiler repair?
Not quite. If the boiler has stopped or shows a fault code, start with a boiler repair visit. If the boiler runs but some radiators or rooms stay cold, the fault is usually in the heating system around it, which is what this page covers. One visit can look at both.
Should I powerflush or replace my radiators?
If several radiators are cold at the bottom and the system water is dirty, a powerflush usually restores them for far less than new radiators. Replacing makes sense when a radiator is leaking, corroded through or the wrong size for the room. You will be told honestly which applies.
More questions? Read the full FAQ or call for advice over the phone.
Related services: Boiler Repair · Powerflush · Boiler Installation
Available across: Battersea · Putney · Balham · Tooting · Wandsworth · Clapham · Streatham · Wimbledon · Colliers Wood · Morden · Dulwich · Croydon · Thornton Heath · Norbury · Sutton · Mitcham · Carshalton · Wallington · All areas covered
Same-day availability
Speak to a Gas Safe engineer today
Fixed prices agreed before any work starts. Book online with the card above, or talk it through first.