Radiator Repair & Installation London
Cold spots, leaking valves, stuck TRVs or a radiator that needs replacing — same-day repair across all London boroughs. From £85 inc. parts.
📞 Call 020 0000 0000Radiator Services — Pricing & What's Involved
Bleeding Radiators
Air trapped in the top of a radiator causes cold spots and reduces system efficiency. Bleeding releases the air and restores heat output. We check system pressure afterwards and re-pressurise if needed.
Included in heating system call-out
TRV Replacement
Thermostatic radiator valves fail in two ways: stuck open (radiator always hot) or stuck closed (no heat). We replace TRVs and lockshield valves on all radiator types, including older convector radiators.
From £85 inc. parts
Radiator Leak Repair
Leaks typically occur at the valve connection, at a pin-hole in the panel (from internal corrosion), or at the bleed valve. We repair or replace the affected component and check for sludge build-up causing the corrosion.
From £95 inc. parts
Cold Bottom Radiators (Sludge)
If the top of the radiator is hot but the bottom is cold, magnetite sludge has settled in the panel. This cannot be fixed by bleeding — the system needs flushing. We advise on targeted single-radiator flushing or a full power flush.
See power flushing page
Radiator Removal & Replacement
Replacing a like-for-like panel radiator takes 1–2 hours including draining down. We drain the circuit to the affected radiator, swap the panel, refill and test. We also upgrade from single to double panel radiators to improve heat output.
£180–£280 inc. new radiator
New Radiator Installation
Adding a radiator to an existing circuit requires a flow and return connection tapping into the nearest accessible pipework. We check whether the pump and boiler can support the extra radiator before quoting.
£220–£420 inc. materials
Why London Radiators Develop Sludge Problems
London's exceptionally hard water (300mg/l+ calcium carbonate) reacts with iron and steel components in heating systems to produce magnetite — a black, abrasive sludge that settles at the bottom of radiator panels and inside pump housings. Systems without a magnetic filter accumulate significant sludge within 3–5 years of installation.
Bottom-cold radiators are the most visible symptom. But sludge also attacks the boiler heat exchanger (causing kettling and inefficiency) and clogs pump impellers (causing noise and eventual pump failure). If multiple radiators have cold spots, a power flush combined with magnetic filter installation is usually the most cost-effective fix.
Radiator Not Heating Properly?
Same-day service. Transparent pricing. £60 call-out waived over 2 hours.
📞 Call 020 0000 0000