Radiator & Central Heating Northampton

Cold at the bottom usually means sludge (magnetite) blocking the radiator. A single cold one can often be removed and flushed; multiple cold radiators point to a system-wide power flush being needed.

Air trapped in the radiator — it needs bleeding. Use a radiator key to release air from the bleed valve (small square at the top corner) until water runs out, then re-check system pressure.

A power flush uses high-velocity water and chemicals to remove sludge, rust, and scale from the heating system. Signs you may need one: multiple cold radiators, noisy boiler, or slow heat-up time.

Yes — we can extend existing pipework and add new radiators to most sealed and open-vented systems. We'll assess capacity and quote accordingly.

Power flushes for a typical 3-bedroom home (8–10 radiators) cost £400–£600. Larger properties or heavily sludged systems are at the higher end. The Energy Saving Trust estimates that a properly flushed heating system can improve boiler efficiency by up to 25%, reducing annual heating bills (Energy Saving Trust, 2024).

Your boiler should be serviced annually by a Gas Safe engineer — this is also a condition of most boiler warranties. The central heating system (radiators, valves, pump) should be checked every 2–3 years, or whenever symptoms like cold spots, unusual noise, or slow heat-up appear.

Most likely cause: a thermostatic radiator valve (TRV) stuck in the closed position — very common and straightforward to replace. Air lock is the second most common cause (the radiator needs bleeding). Magnetite sludge blockage is the third. We'll check all three and fix the root cause.