Boilers, air con, heating, electrics, quotes and warranties
We are based in Dartford and cover SE London and Kent, including Bexleyheath, Sidcup, Swanley, Orpington, Eltham, Thamesmead and Charlton. If you are not sure whether we reach you, call or WhatsApp Anthony on 07896 000354.
Since 2012. The company traded as JJB Electrical & Heating Services until 2026, when it was renamed JJB Heating & Cooling to focus on heating and air conditioning installs, alongside electrical work such as rewires and consumer units.
Yes. JJB is on the Gas Safe Register, registration number 534255 (listed under our former name, JJB Electrical & Heating Services Ltd). You are welcome to ask to see the engineer's Gas Safe ID card, and all gas work is carried out and certified to current regulations.
Yes. Quotes are free and valid for 30 days. We will look at the job, talk through the options and give you a clear written price before any work starts.
Payment is by bank transfer. A deposit of 25% may be required to secure your booking and cover materials, with the balance due when the work is complete.
Monday to Saturday, 08:00 to 18:00. We are closed on Sundays and do not offer a 24-hour call-out service.
We 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.
We install wall-mounted split systems for bedrooms, living rooms and home offices. The indoor unit sits on the wall and connects to a compact outdoor unit.
Yes. JJB Heating & Cooling Ltd holds an F-Gas company certificate from Refcom, number REF1026193. It covers installing, servicing, repairing and decommissioning air conditioning systems.
We size every system from a free survey. Room size, how much sun the room gets and how it is used all affect the size of unit you need, so we never guess.
Many modern split units can also provide heating, which can be useful in spring and autumn. At the survey, we will tell you what the unit you choose can do.
Outside the summer rush. Booking in spring or autumn means the system is ready the moment the hot weather arrives.
It depends on the number of rooms, the size of the units and the pipe run between the indoor and outdoor units. We give you a clear written quote after a free survey.
Yes. We install wet underfloor heating, including low-profile overlay systems for kitchens, bathrooms and extensions, and can check the loops with a thermal camera before the floor goes down.
Yes. We install unvented cylinders such as Megaflo and Gledhill, which give mains-pressure hot water to every tap at once.
Cold spots at the bottom of a radiator usually mean sludge has built up in the system. A power flush clears it and restores the heat output.
Yes. We add and replace radiators and run heating into extensions, checking that your boiler can handle the extra load.
All of our labour carries a 12-month workmanship guarantee, and parts are covered by the manufacturer's warranty.
We carry out full and partial rewires, consumer unit (fuse board) upgrades, kitchen electrics and fault finding for homes across Dartford, SE London and Kent.
Yes. JJB is registered with NAPIT for domestic electrical installation, member number 11895 (listed under our former name, JJB Electrical & Heating Services Ltd). Notifiable work, such as a rewire or a new consumer unit, is certified and notified to building control through NAPIT.
Yes, full or partial. We can combine a rewire with a new boiler or central heating so the work is planned together and done by one firm.
Yes. We replace old fuse boards with modern consumer units. We check the existing wiring first and give you a clear written quote before any work starts.
Yes. Tell us what has stopped working, for example a circuit or an outbuilding that has lost power, and we will find the fault, repair it and explain how to avoid it in future.