How Much is a New Boiler?

Every model and its exact price is on our boiler prices page. Longer guarantees depend on conditions, typically a qualifying filter fitted at installation, registration with the manufacturer and an annual service.

Combi boilers are the most common replacement and run from £2,000 to £2,850 on our list. Regular (heat-only) boilers, for homes keeping a cylinder and loft tanks, run from £2,150 to £2,350. The type you need is set by your hot water demand and mains flow, not by price: one bathroom and a healthy mains flow points to a combi; two bathrooms used at once points to a system or regular boiler with a cylinder. The survey measures your flow rate before recommending one. Our boiler installation page explains the choice in more detail, and our combi vs system boiler guide compares them side by side.

A fitted price should cover the boiler and its standard flue, removal and disposal of the old one, a chemical clean and flush, a filter and inhibitor, the controls Building Regulations Part L requires, the condensate drain, gas tightness and pressure checks, commissioning with a flue gas analysis, guarantee registration and notification to Building Control. Ask every installer to confirm each of those in writing; this is where cheap quotes cut corners.

Some work genuinely adds to a standard swap and should be priced at survey, not found on the day: upgrading the gas pipe from the meter (often from 15mm to 22mm so a modern boiler gets enough gas), moving the boiler to another room, removing a back boiler from behind a fire, replacing corroded radiators or tired pipework, scaffolding for a high flue, and making good beyond a patch. A heavily sludged system may need a powerflush before a new boiler goes on, so the new one is not fed dirty water.

A replacement gas boiler in England must be at least 92% ErP efficient, and when a combi goes into an existing home Part L requires one further efficiency measure, such as weather or load compensation or a smart thermostat with automation and optimisation. Every room should get thermostatic control when a boiler is replaced. A modern condensing boiler set up properly, with a sensible flow temperature, is noticeably cheaper to run than a pre-2005 non-condensing one.

A gas boiler typically lasts ten to fifteen years, and how it is looked after matters as much as the brand. An annual service keeps the manufacturer's guarantee valid and catches wear before it becomes a breakdown, and a clean system with a filter and inhibitor protects the heat exchanger from sludge. That is why the guarantee length is worth weighing alongside the price: a Worcester Greenstar 8000 Life at £2,850 carries up to 12 years when its conditions are met, against two years on the cheapest models.

Many Merseyside semis and terraces still run a back boiler behind a gas fire. No back boiler is made for the UK market any more, so replacing one means a conversion rather than a swap: the fire and unit come out, the chimney is dealt with, and the new boiler goes into the kitchen, utility or airing cupboard with new gas, condensate and heating pipework. These jobs take two to three days and are quoted individually, above the standard swap range.

Finance is available at 0% and 7.9% APR through Novuna Personal Finance, subject to status, with a 14-day cooling-off period; we are a credit broker, not a lender. Our finance page shows representative examples. There is no obligation to take finance to get a quote.

If your boiler is under ten years old with a decent service history, a repair is usually the better call. If it is twelve to fifteen years old, the fault is the heat exchanger or gas valve, or the breakdowns are becoming regular, replacement starts to make more sense. Our boiler repair engineers will give you both figures before you decide, and our guide to how long a boiler lasts covers the warning signs.