Merton · SW19 · Greater London
Order a replacement boiler online at a fixed price and have it fitted at your Merton home by a Gas Safe registered engineer, often as soon as tomorrow. Replacement gas boilers in Merton cover combi swaps, system boilers for larger houses, back boiler removals and complete heating upgrades.
Merton runs from Wimbledon Village villas to the Wimbledon Park garden suburb and terraces in Mitcham and Colliers Wood. We fit Worcester Bosch, Vaillant, Ideal, Baxi and Viessmann boilers across SW19, SW20, CR4 and SM4.
Large villas in Wimbledon Village often have several bathrooms, so a Viessmann or Worcester Bosch system boiler with an unvented cylinder is usual. Terraces in Mitcham and Colliers Wood are mostly a combi conversion or swap, where the Vaillant ecoFIT pure and Ideal Logic Max are both good options. Morden’s interwar homes are generally a straightforward like-for-like job.
Boiler prices in Merton depend on the size and type of home. A flat in Colliers Wood, a Wimbledon villa and a semi in Morden each need different boilers, and flue routes, cylinder choice, pipework and controls all move the figure. Like-for-like combi swaps start from £1,759 fitted, while Worcester Bosch Greenstar 4000 packages start from around £2,450. The total you’re shown when you book is the total on your invoice. There’s no haggling on the doorstep.
| 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 Merton 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. Shorter terms and buy now, pay later options are also available, along with interest-free finance, all subject to status. See our boiler finance options for the full details.
Merton’s housing is more varied than it looks. These are the jobs we fit most, and what suits each.
Large homes need a boiler sized to the whole house, with a system boiler and cylinder for several bathrooms.
A compact condensing boiler keeps the layout simple, with old pipework tidied during the fit.
Straight swaps with new controls and a filter deliver the best value with the least disruption.
Local boiler installers
Merton is a south-west London borough best known for Wimbledon, where large Victorian villas and a village high street sit beside the common. Colliers Wood and Mitcham have Victorian and Edwardian terraces, Raynes Park and Morden are lined with interwar semis, and Merton Park is a garden suburb of detached homes.
Wimbledon-sized houses bring bigger heating and hot water demands than a typical terrace. When we price boiler replacement in Merton we look at the size of the home, the pipework and the flue route first, so the fixed price is for a boiler that keeps up.
Once you have chosen your boiler and date online, a Gas Safe registered engineer arrives to remove the old unit, fit and commission the new one, flush the system, register the warranty and notify Building Control, so everything is signed off before they leave.
Merton ranges from Wimbledon’s large villas to Mitcham’s terraces and Morden’s interwar semis. Here is what we see most.
Merton tap water is very hard, so scale builds quickly inside combi boilers. We look up your postcode and add a scale reducer to a combi installation when hardness exceeds 200ppm.
Large Victorian houses often have several bathrooms. We size a system boiler and unvented cylinder to keep hot water strong.
Detached homes here have design controls that can affect flues. We choose a discreet route and flag any consent needed.
Older terraces often have original pipework and tight boiler cupboards. We survey the system and fit a compact condensing boiler.
Roomy interwar semis suit a straightforward combi swap. We check mains flow first, then add a filter and controls upgrade.
Flats around Wimbledon and Colliers Wood need compact combis and flue routes that meet building rules. We check both first.
Our Gas Safe engineers cover the whole borough, from Wimbledon and Colliers Wood to Mitcham, Morden and Raynes Park. See all our service areas.
Red pin: Merton town centre. Green pins: nearby towns we cover — tap a pin to see how far each town is from Merton. The shaded circle shows roughly 8 miles around Merton.
We also cover London as a whole, plus neighbouring Wandsworth (about 2 miles), Sutton (about 4 miles) and Kingston upon Thames (about 4 miles).
Often as soon as the next day, depending on the boiler you choose and engineer availability in the SW19 area. Complete the online quote, pick a convenient date, and we prioritise bookings where there is no heating or hot water.
All SW19 postcodes plus SW20, CR4 and SM4, including Wimbledon, Mitcham, Morden, Colliers Wood and Raynes Park, and nearby areas such as Wandsworth, Sutton and Kingston. Thanks to a nationwide network of Gas Safe engineers, we also reach the wider area.
Merton tap water is very hard, usually above 200ppm. You can 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. We remove the back boiler and the fire in front of it, then deal with the old flue and pipework so nothing is left live. Your new condensing boiler – combi or system – is positioned where it makes more sense. This is slower than a straight swap. Timings are confirmed at booking, not on the day.
Boiler replacement is notifiable work under Building Regulations, which your Gas Safe registered engineer handles, with a compliance certificate afterwards. Planning permission is not normally needed for a like-for-like swap, but in Wimbledon Village, Merton Park and Mitcham Cricket Green there are conservation areas, so check with Merton Council before moving a flue to a front-facing wall.
Yes. Boiler finance in Merton 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. The old boiler is disconnected, taken away and disposed of by your engineer, along with any tanks or cylinder you no longer need if you’re switching 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. Not on mains gas? We can replace an oil or LPG boiler as well. Oil is handled by OFTEC registered engineers, LPG by Gas Safe registered engineers who are LPG competent. 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 Merton and book the installation date that suits you – all online, in a few minutes.