Like-for-like swaps
Replacing an old combi, system or regular boiler with a new one in the same place, usually in a day or two.
New Boiler Installation in Maidstone
Replacing an old boiler or switching to a combi? Compare quotes from up to 3 vetted, Gas Safe registered engineers in Maidstone.
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Boiler installations we can help with
Conversions and moves
Switching to a combi and removing the cylinder and loft tanks, or moving the boiler to a loft, utility room or cupboard.
The rest of the system
System flushes, magnetic filters, new controls and thermostatic radiator valves, fitted alongside the new boiler.
A new boiler must be fitted by a Gas Safe registered engineer. Ask to see their Gas Safe ID card, and check the back to confirm they're qualified to install boilers. They should register the new boiler with Building Control through the Gas Safe Register's notification scheme. You'll then get a Building Regulations Compliance Certificate in the post. Keep it with your house documents, as you'll need it when you sell.
The biggest factor in the price is whether you're swapping like for like or changing the type of boiler. Replacing a combi with a combi in the same place is the quickest and cheapest job. Many of Maidstone's Victorian and Edwardian terraces still have a regular boiler with a hot water cylinder and tanks in the loft. Converting to a combi frees up the airing cupboard and loft, but suits homes with one bathroom best. With two or more bathrooms used at once, a system boiler with an unvented cylinder may be the better choice. Moving the boiler, for example into the loft or a utility room, adds pipework and flue work.
Maidstone's hard water matters here. South East Water, which supplies the town, says most of its water comes from underground chalk. Limescale builds up in a combi's hot water heat exchanger, so building regulations require scale protection on the incoming water in hard water areas. Check every quote includes it, along with a magnetic system filter and inhibitor. On older systems, a flush before the new boiler goes in protects it from sludge in the existing radiators and pipework.
If your home is listed or in one of Maidstone's 41 conservation areas, ask where the new flue will come out before you agree a design. A flue on the front of the house may need permission, especially in the Holy Trinity Church conservation area, where an Article 4 direction covers most changes to the outside.
Warranties vary from a few years to ten or more, but almost all depend on an annual service. Ask how long the warranty is and what you need to do to keep it.
Get at least three quotes, and make sure each one covers the same work: the boiler model and warranty, flue, filter, scale reducer, controls, any system flush, and removing the old boiler. Reviews on Trade Pilot come from real, invoiced jobs, so you can see installations an engineer has actually been paid for.
Typical prices
| Job | Typical UK range | Notes |
|---|---|---|
| New combi, like-for-like swap | £2,200–£4,000 | Depends on the brand, flue and warranty length |
| New system or regular boiler, like-for-like | £2,500–£4,500 | A new cylinder is extra if needed |
| Conversion to a combi | £3,500–£5,500 | Includes removing the cylinder and loft tanks |
| Moving the boiler | Add £500–£1,500 | Depends on the distance and the pipe and flue route |
| Magnetic system filter, fitted | £150–£280 | Often fitted with a new boiler |
| Power flush | £400–£800 | Depends on the number of radiators and the system's condition |
Typical UK ranges; your quotes depend on the job and access.
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How Trade Pilot helps you hire in Maidstone
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Frequently Asked Questions
A like-for-like combi swap usually costs £2,200 to £4,000 fitted. Converting to a combi, including removing the cylinder and loft tanks, is typically £3,500 to £5,500.
A like-for-like swap usually takes one to two days. A conversion or a boiler move can take two to four days.
If the boiler is over 10 to 15 years old, breaks down often or needs an expensive part, replacement is often better value. A new boiler is also more efficient, so your gas bills should fall.
Yes. Maidstone's water is hard, and building regulations require scale protection on the incoming water in hard water areas. Check every quote includes it.
There's no general grant for a new gas boiler. The Boiler Upgrade Scheme gives up to £7,500 towards a heat pump, not a gas boiler. Help for low-income households changes over time, so check GOV.UK for current schemes.
The Building Regulations Compliance Certificate, the commissioning checklist (often called the Benchmark checklist) filled in by the installer, and the warranty registration. Keep them with your house documents.
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