Radiator Installation & Replacement in Hertfordshire

A like-for-like radiator swap (remove old, fit new in same position on existing pipework) starts from £180 ex VAT including labour and disposal of the old unit. A new radiator where no pipework currently exists (new extension, new room) starts from £350 ex VAT including pipework. Designer and column radiators start from £450 ex VAT fitted. Prices include supply of a standard panel radiator — you can supply your own if preferred.

A like-for-like swap on an existing system typically takes 2–3 hours per radiator. Adding a new radiator where pipework needs to be extended takes 3–5 hours depending on the pipe run. Fitting a designer or column radiator with bespoke pipework can take up to a full day. We complete most single radiator jobs in a single visit.

Yes — in most cases this is straightforward. We extend the pipework from the nearest flow and return pipes, fit the new radiator with a TRV and lockshield valve, then rebalance the whole system so every radiator heats evenly. The main consideration is whether your boiler has sufficient capacity for the additional heat load. We assess this at the survey stage.

Not necessarily. One or two additional radiators in a standard property can usually be accommodated by the existing boiler. If you are adding five or more radiators or significantly extending the heated area (a large extension or loft conversion), we will check the boiler's output against the new heat demand. If the boiler is undersized, we will advise — but in many cases it is adequate.

Radiator output (measured in BTU or Watts) is calculated from room volume, insulation standard, number of windows and whether it is an external room. A rough guide: multiply the room volume in cubic metres by 153 to get the minimum BTU required. For example, a 3m × 4m × 2.4m room needs approximately 4,400 BTU (1,290W). We calculate this precisely for every installation using a proper heat loss assessment.

Signs that a radiator needs replacing include: pinhole leaks (weeping at seams or joints caused by corrosion); persistent cold spots at the bottom even after a power flush; significant external corrosion; and physical damage. Cold spots at the top are usually trapped air (solved by bleeding) and do not require replacement. We always diagnose the root cause before recommending a new radiator.

Yes. We supply and fit vertical panel radiators, traditional column radiators (including multi-column styles), horizontal flat panel radiators and all designer styles. Column and designer radiators often require bespoke pipework to position connections at the floor or in the wall — we handle all of this as part of the installation.

Yes. Dual fuel (or electric/central heating) towel rails can be connected to the central heating system for use in winter and switched to electric operation in summer when the heating is off. We fit dual fuel towel rails with appropriate isolating valves and connect the electric element to a switched fused spur. The electrical connection must be carried out by a competent electrician — we can coordinate this or work alongside your own electrician.

Adding correctly sized radiators to a properly designed system should not significantly increase bills — in fact, if you are replacing undersized or inefficient old radiators, your bills may fall. The key is correct sizing: oversized radiators heat up fast but cause the boiler to short-cycle (switch on and off rapidly), which reduces efficiency. We size every radiator precisely to avoid this.

Yes. Cast iron radiators are popular in Victorian and Edwardian properties in Hertfordshire as they complement period interiors and retain heat well after the boiler switches off. They are heavier and slower to heat up than steel radiators but are extremely long-lasting. We supply and fit reproduction cast iron radiators and can also refurbish original cast iron radiators if they are structurally sound.

A modern steel panel radiator, properly maintained with inhibitor in the system and a magnetic filter, should last 15–20 years or more. In Hertfordshire's hard water without inhibitor, corrosion from the inside (magnetite sludge) can reduce this to 8–12 years. Cast iron and aluminium radiators have longer natural lifespans. We recommend checking inhibitor levels annually at the boiler service.

If your system water is contaminated with black sludge (magnetite) — indicated by cold spots at the bottom of existing radiators, dark water when you bleed them, or a boiler that kettles — then yes, a power flush before fitting new radiators is strongly recommended. Fitting new radiators into a contaminated system will cause them to accumulate sludge rapidly and perform poorly. We will advise after a system assessment.

Yes — removal and disposal of the old radiator is included in the installation price. We drain the radiator, remove it, cap the pipework if needed and take the old unit away. There is no additional charge for this. If you want to keep the old radiator for any reason, just let us know.

We provide a 12-month workmanship guarantee on all radiator installation work — covering the installation, pipework connections and any associated work we carry out. The radiator itself carries the manufacturer's guarantee (typically 2–10 years depending on the brand and model), which we will register on your behalf if required.