Heat fault assessment
Temperature pattern, valves, bleeding, pressure and wider circuit behaviour considered.
Alesta · Radiator services in London
Radiator work planned around the whole heating circuit.
Repairs, replacements and new radiator installation organised around heat output, pipe positions, wall support, valves and the condition of the connected system.
☎ Call 020 3608 3976System before single component
A cold radiator does not always need replacing.
Air, stuck valves, poor balancing, sludge, circulation faults and controls can all affect heat. Diagnosis comes before deciding whether repair, flushing, valve work or replacement is proportionate.
For a new radiator, room demand, available wall, pipe route and system capacity matter as much as style. Decoration, electrical work, boiler faults and whole-system flushing are separate where required.
Repair and valve work
Accessible leaks, vents and suitable valves addressed to the agreed scope.
Replacement planning
Dimensions, output, brackets, pipe centres and wall construction checked first.
Refill and operation checks
Connections, pressure, bleeding and basic heat response reviewed after work.
Common reasons customers call
When a radiator leaks, stays cold or no longer suits the room.
Heat is uneven or absent
The radiator and wider system need checks before parts are ordered.
A valve or connection is leaking
Isolation, corrosion and fitting condition determine a safe repair.
An old radiator is corroded
Replacement must match output, pipework and wall support.
A renovation needs a new size or position
Heat demand, routes, floor access and finishes require coordination.
Why Alesta for radiator work
A room-level improvement connected to system reality.
Cause assessed before replacement
Cold spots and circulation symptoms are not solved with a cosmetic swap by default.
Output and dimensions checked
The selected radiator must suit room demand and available installation space.
Pipe and wall access planned
Centres, valves, brackets, lifting and floor routes are confirmed.
System effects explained
Drain-down, pressure, balancing and any wider heating limitation remain visible.
A system-aware installation
How we repair or replace radiators.
We begin with the symptom or desired change. For faults, we ask which radiators are affected, whether the top or bottom stays cold, if valves move, boiler pressure and recent system work. For replacement, we request radiator dimensions, pipe-centre measurements, wall photographs, floor type and the room size and use. Customer-selected products are checked for output, connections, weight, valve requirements and delivery condition before installation is promised.
At the property, the engineer checks the radiator, valves, accessible pipework and relevant heating behaviour. A cold unit may need bleeding, valve assessment or wider circulation diagnosis rather than replacement. Leaks are traced to the vent, valve, tail, panel or pipe connection. Before draining or isolating, the engineer confirms controls, system type and access, and protects floors and nearby finishes. Gas-appliance work is undertaken only by appropriately qualified personnel where required.
For agreed replacement, the circuit is safely isolated or drained to the necessary level. The old radiator is removed carefully, noting that residual water can be discoloured. Brackets are positioned into suitable support, and valves and tails are fitted compatibly. Altered pipe positions may require floor or wall access and separate making good. Existing corrosion or heavily contaminated system water can change the scope and is shown before a new radiator is connected.
The system is refilled or restored, air is released and accessible joints are checked as pressure and temperature change. The radiator is observed for heat response and valves are set appropriately; broader balancing may require attention across the property. Boiler pressure and controls are returned to a normal agreed condition. The engineer explains any need for inhibitor, flushing, further leak observation or decorating, distinguishing the installed component from unresolved whole-system performance.
Clear pricing
Radiator service prices.
Cost depends on diagnosis, radiator size and weight, valves, pipe changes, wall support, system drain-down, access and product supply.
| Service scope | Price | What affects the final price |
|---|---|---|
| Radiator fault or leak assessment | Quoted after assessment | Symptom, valves, system condition, access and repair parts |
| Like-for-like radiator replacement | Quoted after assessment | Radiator, valves, brackets, drain-down and labour |
| New size, type or position | Quoted after assessment | Heat output, pipe alterations, wall support, floors and making good |
Pricing context: Photos, dimensions and system details are required. Radiator supply, power flushing, boiler repair, electrical work and decoration are included only when stated.
How the service works
From heat problem or room plan to tested radiator operation.
Share symptoms or dimensions
Send radiator, valves, wall, pipes and relevant system information.
Confirm repair or installation scope
We agree product, output, access, drain-down and related work.
Connect, refill and check
The radiator is tested for leaks and basic heat response after restoration.
Radiator services FAQ
Before the heating visit.
Useful answers about cold radiators, sizing, supplied products, drain-down, walls, testing and pricing.
☎ Call 020 3608 3976Why is my radiator cold?
Air, valves, balancing, sludge, circulation, controls or a wider heating fault can be responsible. The temperature pattern and system need assessment before replacement is recommended.
Can you repair a leaking radiator?
Some vent, valve and connection leaks are repairable. A corroded or perforated panel generally needs replacement, subject to system and access checks.
How is the correct radiator size chosen?
Room heat demand, insulation, glazing, use, available wall space and system temperatures influence output. Physical size alone is not an adequate specification.
Can I supply my own radiator?
Yes, after output, dimensions, weight, connections, valves and delivery condition are checked. Product defects or missing parts remain subject to the supplier terms.
Will the whole system be drained?
That depends on system type, valves and work scope. Some jobs can be isolated locally; others require partial or full drain-down and refill.
Is wall or floor repair included?
Only when stated. New brackets, pipe routes or different dimensions can expose old fixing holes or require access and separate making good.
What affects the final price?
Diagnosis, radiator supply, size, weight, valves, pipe alterations, drain-down, wall construction, access and system condition influence the quote.