Nobody wakes up excited about a boiler installation. It's not a kitchen renovation you've been dreaming about, it's usually a decision forced by a boiler that's finally given up, or one that's cost more to keep patching than replacing outright. So the two things people actually want to know are simple: what happens, and what's it going to cost. Here's the honest version, not the version written to get you off the phone quickly.
Before anyone talks price, the type of boiler decides half of what happens next. A combi boiler heats water on demand and skips the need for a separate tank, which suits smaller properties or homes tight on storage space. A system boiler works well where hot water demand is heavier, say a bigger family running multiple showers, but needs somewhere to house a cylinder. Regular (or "heat only") boilers tend to show up in older properties that already have the pipework and cylinder set up for one.
None of these is the "better" option in the abstract. It depends on the property, the number of bathrooms, and how the current system's laid out. A decent engineer will ask about your household before recommending anything, not just point you toward whatever's sitting in the van.
For a like-for-like swap, where the new boiler goes roughly where the old one was and the existing pipework and radiators stay put, the job is usually a single day. Where it stretches to two to five days is when radiator positions are changing, pipework needs replacing, or it's a full central heating installation rather than a straight boiler swap.
| Job type | Typical timeframe |
|---|---|
| Like-for-like boiler swap | Usually completed in a day |
| Full central heating installation | 2–5 days, depending on property size and pipework |
At the end of a proper installation there's a commissioning visit, the system gets balanced, the programmer gets set up, and someone actually walks you through the controls instead of leaving you to figure it out from a manual. That last step gets skipped more often than it should, and it's usually the reason people end up not using half the features their new boiler actually has.
This is where a lot of quotes get vague on purpose. JTS Plumbing & Heating's own figures for a full central heating installation sit between £3,500 and £8,000, and where you land in that range depends on property size, the number of radiators, how much pipework needs doing, and the boiler you choose. A straight boiler swap that reuses existing pipework and radiators is generally a lot less than that full-system figure, since most of the groundwork's already in place.
There's currently £200 off every new installation and 10% off servicing as part of the winter offer, worth asking about when you get a quote. JTS also provides free written estimates on major works, including boiler swaps and new installations, and those estimates hold for three months, so you're not under pressure to sign off on the spot.
Any work on a gas boiler or gas pipework in the UK legally requires a Gas Safe registered engineer, and their card lists exactly which categories of gas work they're qualified for, not every Gas Safe engineer is signed off for every type of installation. Checking the register at gassaferegister.co.uk takes about two minutes, and it's worth doing regardless of who you end up using. JTS Plumbing & Heating's engineers are Gas Safe registered for the boiler installation and heating work they carry out, and it's the kind of thing worth confirming before anyone starts unscrewing pipework, not after.
JTS Plumbing & Heating has been installing and servicing boilers across Hertfordshire for over 10 years, with regular work in Cheshunt, Waltham Cross, Harlow, and Enfield. Older housing stock in this part of Hertfordshire often means pipework and layouts that don't quite match a textbook install, which is exactly where local experience saves time rather than adding to it.
A like-for-like swap is usually done in a day. If it's a full central heating installation with new radiators or pipework, budget for 2 to 5 days depending on the size of the property.
A boiler installation on its own replaces the unit and reuses what's already there. A full central heating installation covers radiators, pipework, and controls too, which is why the cost and timeline both jump.
It depends heavily on scope. JTS Plumbing & Heating's figures for a full central heating installation run £3,500 to £8,000, driven by property size, radiator count, pipework, and the boiler chosen. A straight swap that reuses existing pipework generally costs less.
For most of it, yes, particularly for the commissioning stage where the engineer walks you through the controls and confirms everything's balanced properly.
Yes. Free written estimates are available for major works including boiler swaps and new installations, and they're valid for three months, so there's no rush to decide on the day.
A boiler installation isn't complicated once you know what's actually involved, the right boiler type for your household, a realistic timeframe, and a Gas Safe registered engineer who tells you the real cost drivers instead of a vague number. If your current boiler's on its last legs or you're just tired of the repair bills, get in touch with JTS Plumbing & Heating for a free written estimate before winter bookings fill up.
£200 off every new installation this winter, Gas Safe registered engineers, and a fixed quote that holds for three months. No pressure, no hidden costs.
