Vaillant-approved installs with up to 10-year warranties
JJB Heating & Cooling installs new boilers across Dartford, SE London and Kent, typically £2,000 to £4,500 supplied and fitted. As a Vaillant-approved installer, we can offer extended Vaillant warranties of up to 10 years on qualifying boilers. A straightforward combi swap is usually done in a day and includes a power flush as standard.
A new boiler is a big decision, and it should be fitted by someone who will still be answering the phone years later. Anthony has been installing and looking after boilers across Dartford, SE London and Kent since 2012, and he stays your point of contact from quote to handover. We cover Bexleyheath, Sidcup, Swanley, Orpington, Eltham, Thamesmead and Charlton.
We fit combi, system and electric boilers from Vaillant, Worcester Bosch, Baxi and other leading brands.
A like-for-like combi swap is normally done in a single day, and a power flush is included as standard so the new boiler starts life on clean water. If an old system is badly sludged and needs a second day, we tell you before any extra cost is added.
Installs typically fall between £2,000 and £4,500 depending on the boiler, the location and any pipework changes. You get a clear written quote first, and the system is commissioned and tested, with a walk-through of your new controls before we leave.
From the survey to the handover, here is what actually happens when your combi boiler is replaced, how long it takes and why a power flush matters.
Read ArticleA new Vaillant system boiler, Megaflo unvented cylinder and water softener installed in one plant room, with neatly clipped pipework and heating manifolds.
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A Vaillant system boiler and a Gledhill 210-litre horizontal unvented cylinder installed in a loft, keeping both out of the living space and giving strong mains-pressure hot water.
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Air conditioning supplied and installed for homes across Dartford, SE London and Kent.
Learn MoreWe are a Vaillant-approved installer, so we can offer an extended Vaillant warranty of up to 10 years on qualifying boilers. Other brands carry the manufacturer's own warranty, and all of our labour has a 12-month workmanship guarantee.
Most installs fall between £2,000 and £4,500 supplied and fitted. The price depends on the boiler, where it is going and how much pipework needs changing. You get a clear written quote first.
A like-for-like combi swap is usually done in a single day. If a system is heavily sludged and needs a second day of cleaning, we explain why and agree the cost with you first.
Yes. A power flush is included as standard with our combi boiler swaps, so your new boiler starts on clean system water.
We fit Vaillant, Worcester Bosch, Baxi and other leading brands, including combi, system and electric boilers. As a Vaillant-approved installer, we usually recommend Vaillant, as we can offer an extended warranty of up to 10 years.