Bexley · DA6 · Greater London
Choose a new boiler online at a fixed price and a Gas Safe registered engineer will fit it at your Bexley home, often from the very next day. Replacement gas boilers in Bexley cover combi swaps, system boilers for larger houses, back boiler removals and full heating upgrades.
Bexley is mostly interwar semis in Bexleyheath and Welling, with larger detached homes in Sidcup and older houses that still have a back boiler. In DA5 to DA16 we fit Baxi, Ideal, Vaillant, Worcester Bosch and Viessmann boilers.
Back boilers are a common job here, removed along with the fire and replaced with a wall-hung combi such as the Baxi 830 in a new position. Interwar semis are usually a like-for-like swap to an Ideal Logic Max or Vaillant ecoFIT pure. Larger homes in Sidcup often suit a Worcester Bosch system boiler.
Replacement boiler prices in Bexley depend on the home rather than the postcode. A semi in Bexleyheath often needs a straight combi swap, while a larger house in Sidcup may call for a system boiler and cylinder, and flue, pipework and controls all move the price. Like-for-like combi swaps start from £1,759 fitted, while Worcester Bosch Greenstar 4000 packages start from around £2,450. Your quote is locked in once you’ve chosen your boiler. The price covers fitting, commissioning and removal of the old boiler.
| Installation type | What’s involved | Price from | Time on site |
|---|---|---|---|
| Like-for-like combi swap | Replace an existing combi in the same position, with new flue, filter and controls | £1,759 | 1 day |
| Conventional or system to combi | Remove tanks and cylinder, cap off pipework, fit combi and upgrade gas supply if needed | £2,350 | 1–2 days |
| Back boiler replacement | Remove back boiler and fire, make good, fit new boiler in a new location | £2,795 | 2+ days |
| System boiler with cylinder | Suited to larger homes with multiple bathrooms; new or replacement unvented cylinder | £2,995 | 1–2 days |
| Boiler relocation | Move the boiler to a loft, garage or new room with new gas, flue and condensate runs | £2,250 | 1–2 days |
These are starting prices for a standard installation by a Gas Safe registered engineer; your online quote confirms the exact cost for your home.
Get a new boiler on finance in Bexley from £23.26 a month. As an example, a £1,799 boiler spread over 10 years at 9.9% APR works out at £23.26 per month. You can also choose a shorter term, interest-free, or buy now, pay later – all subject to status. See our boiler finance options for the full details.
Bexley’s mostly family-house stock suits a few clear boiler choices. These are the jobs we fit most.
A straight combi swap with a filter and new controls is often the most cost-effective answer.
Compact condensing boilers keep the layout simple and cut running costs, especially where space around the boiler is tight.
A system boiler and cylinder handle several bathrooms and larger households without a drop in pressure.
Local boiler installers
Bexley sits on London’s south-eastern edge, and its housing is dominated by family houses: inter-war semis in Bexleyheath and Welling, terraced rows around Erith and Belvedere, and large detached homes in Sidcup and Blackfen. Danson Park and the green areas around Bexley Village give the borough a more suburban feel than most of south-east London.
Houses of the same age often fail in the same ways, but each has been altered. When we price boiler swap in Bexley we look at the pipework, the airing cupboard and the flue route first, so the fixed price covers a boiler that fits the layout.
With your boiler and installation day chosen online, a Gas Safe registered engineer fits the new unit, removes and disposes of the old boiler, flushes the system, registers the warranty and notifies Building Control for you.
Bexley is one of London’s most house-dominated boroughs, with a lot of interwar and post-war semis. Here is what we see most.
Bexley water is very hard, so scale builds quickly inside combi boilers. If your postcode shows hardness over 200ppm, a scale reducer goes in alongside a combi.
These roomy semis often have an airing-cupboard boiler that swaps easily. We check mains flow before recommending a combi.
Some older Bexley homes still have a back boiler behind a fireplace. We remove it, make good and move to a modern condensing boiler.
Bigger houses in Sidcup and Blackfen often need a system boiler and unvented cylinder for several bathrooms.
Low-lying areas near Erith and Belvedere can flood. We position boilers above ground level where we can and check flue clearances.
Terraces have limited space and shared walls. We plan the flue route and condensate drainage carefully before work starts.
Our Gas Safe engineers cover the whole borough, from Bexleyheath and Sidcup to Welling, Erith and Crayford. See all our service areas.
Red pin: Bexley town centre. Green pins: nearby towns we cover — tap a pin to see how far each town is from Bexley. The shaded circle shows roughly 8 miles around Bexley.
We also cover London as a whole, plus neighbouring Bromley (about 6 miles) and Lewisham (about 6 miles).
Often as soon as the next day, depending on the boiler you choose and engineer availability in the DA6 area. Complete the online quote, then choose a date; if you’re without heating or hot water, we move your booking up.
All DA6 postcodes plus DA5, DA7, DA8, DA14, DA15, DA16 and DA17, including Bexleyheath, Sidcup, Welling, Erith and Crayford, and nearby areas such as Bromley, Eltham and Dartford. Being part of a nationwide network of Gas Safe engineers means we also cover the surrounding area.
Bexley tap water is very hard, normally above 200ppm. Check your postcode on your supplier’s hardness checker. Where it exceeds 200ppm we fit a scale reducer with a combi boiler, as Building Regulations guidance advises.
Yes. Replacing a back boiler involves taking out the old unit and fireplace, then tidying away the redundant flue and pipes. The new boiler, whether combi or system, is fitted in a spot that works better for pipework and flue. These installs take more time than a like-for-like change. We always explain the time needed beforehand.
Boiler replacement is notifiable under Building Regulations, and your Gas Safe registered engineer notifies Building Control and issues a compliance certificate. Planning permission is not normally needed for a like-for-like swap, but in Bexley Village or around Danson, check with Bexley Council first if a new flue would face the road.
Yes. Boiler finance in Bexley includes interest-free, 9.9% APR and buy now, pay later options, with deposits from £0 – see our boiler finance page. All finance is subject to status.
Yes. Your engineer will disconnect and remove the old boiler and dispose of it, and clear any redundant tanks or cylinder if you’re changing to a combi.
All boilers we install come with a manufacturer-backed warranty, typically between 5 and 10+ years depending on the model. Keeping it valid usually means an annual service – our boiler cover plans take care of that for you.
Yes. Properties without mains gas can still get a new boiler – we replace oil and LPG systems. OFTEC registered engineers fit oil boilers, and Gas Safe registered engineers with LPG competence fit LPG boilers. See our oil boiler installation and replacement and LPG boiler installation and replacement pages for more detail.
Tell us about your home, see fixed-price replacement boiler packages for Bexley and book the installation date that suits you – all online, in a few minutes.