Hounslow · TW3 · Greater London
Order a replacement boiler online at a fixed price and have it fitted at your Hounslow home by a Gas Safe registered engineer, often as soon as tomorrow. Replacement gas boilers in Hounslow cover combi swaps, system boilers, back boiler removals and full heating upgrades.
Hounslow covers Victorian terraces in Chiswick, the Arts and Crafts houses of Bedford Park, new flats in Brentford and family semis further west. We install Worcester Bosch, Vaillant, Ideal, Baxi and Viessmann boilers across TW3 to TW5, TW8 and W4.
Bedford Park is a conservation area, so we keep flues and pipework out of sight where possible. Chiswick terraces with a loft tank are often converted to a combi such as the Worcester Bosch Greenstar 4000. New flats in Brentford typically suit a compact Baxi 830 or Ideal Logic Max.
Boiler prices in Hounslow depend on the type of home. A flat in Brentford, a Victorian terrace in Chiswick and a semi in Feltham each need different boilers, and flue routes, cylinder choice and controls all move the final 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. The only change would be one you ask for yourself.
| 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 Hounslow 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.
Hounslow’s housing ranges from period Chiswick to interwar suburbs. These are the jobs we fit most.
A system boiler and cylinder suit larger period homes, keeping pressure strong across floors.
A compact combi saves space, with the flue route and building rules checked first.
Straight swaps with a filter and new controls give the best value in these interwar homes.
Local boiler installers
Hounslow runs from Chiswick’s Victorian and Edwardian streets and riverside through Brentford’s new developments and Isleworth to the interwar semis of Hounslow, Heston and Feltham, with Heathrow Airport at the western edge. Bedford Park’s Arts and Crafts houses sit in the north-east, while Osterley has leafy suburban streets.
With such a wide mix of ages and sizes, one boiler type never fits all. When we price boiler swap service in Hounslow we survey the property, check the flue route and look at hot water demand first, so the fixed price is for the boiler that suits it.
Once you have picked your boiler and date online, a Gas Safe registered engineer removes the old unit, fits and commissions the new one, flushes and protects the system, and registers the guarantee, so everything is signed off before they leave.
Hounslow stretches from Chiswick’s Victorian streets to Heathrow’s edge, with a wide mix of homes. Here is what we see most.
Hounslow tap water is very hard, so scale builds fast in combi heat exchangers. We look up your postcode and add a scale reducer to a combi installation when hardness exceeds 200ppm.
Terraces and villas in Chiswick often have original pipework and tight boiler cupboards. We survey the whole system before we quote.
These houses have design controls that can affect flues. We choose a discreet route and flag any consent needed.
Newer riverside flats may have specified boilers and warranty conditions. We work within them and check building rules.
Interwar semis often suit a straight combi swap. We check mains flow first, then add a filter and modern controls.
Busy approach roads can affect arrival times. We plan access and parking so installs start on schedule.
Our Gas Safe engineers cover the whole borough, from Hounslow and Brentford to Chiswick, Isleworth, Feltham and Heston. See all our service areas.
Red pin: Hounslow town centre. Green pins: nearby towns we cover — tap a pin to see how far each town is from Hounslow. The shaded circle shows roughly 8 miles around Hounslow.
We also cover London as a whole, plus neighbouring Richmond upon Thames (about 3 miles), Ealing (about 4 miles) and Hillingdon (about 7 miles).
Often as soon as the next day, depending on the boiler you choose and engineer availability in the TW3 area. Complete the online quote, pick a convenient date, and we prioritise bookings where there is no heating or hot water.
All TW3 postcodes plus TW4, TW5, TW7, TW8, TW13, TW14 and W4, including Chiswick, Brentford, Isleworth, Feltham and Heston, and nearby areas such as Ealing, Richmond and Hillingdon. Thanks to a nationwide network of Gas Safe engineers, we also reach the wider area.
Hounslow tap water is very hard, normally above 200ppm. You can check your postcode on your supplier’s hardness checker. Where it is above 200ppm, we fit a scale reducer with a combi boiler, in line with Building Regulations guidance.
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. From there, a condensing boiler is installed in a position chosen at survey. This is slower than a straight swap. We confirm the timescale before we start.
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 Chiswick Riverside, Bedford Park and Osterley there are conservation areas, so check with Hounslow Council before moving a flue to a front-facing wall.
Yes. Boiler finance in Hounslow 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 work goes to OFTEC registered engineers; LPG work goes to Gas Safe registered engineers with LPG competence. 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 Hounslow and book the installation date that suits you – all online, in a few minutes.