Fully Insured Gas Safe Registered 0% Finance Available Price Match Guarantee Flexible Payment Options

Gas Safe Registered 0% Finance Available Price Match Guarantee Flexible Payment Options Fully Insured

0% Finance Available Price Match Guarantee Flexible Payment Options Fully Insured Gas Safe Registered

Gas Safe Registered 0% Finance Available Price Match Guarantee Flexible Payment Options Fully Insured

About Us

Cosy Boilers can install a new and efficient boiler for your home. With our affordable pricing, flexible financing options, and work guarantee, you can trust us for all your boiler needs. Boiler installation in London, Hertfordshire and Essex.

Our Accreditations

Gas Safe Registered

Gas Safe Registration Number 577771

Valliant Accredited Installers

Worcester Bosch Accredited Installers

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Worcester Bosch Logo
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Why choose us?

Happy Customers

Open Daily

Gas Safe

Napit Approved
Electrical Installers


Installed in
24 Hours

One Fixed Price & Price Match Guarantee

No Deposit

Frequently asked questions...

If you can’t find the answer to your question, please get in touch and one of experienced engineers will be able to help.

Boiler replacement costs depend on type, installation complexity and location. We’ve created a simple form to complete in order to get an accurate quote for your home.

We can install brand new fixed priced boilers in as little as 24 hours. Get a quote today and we’ll be in touch with a price.

You’ll receive up to 12 years manufacturers warranty on all new boilers.

Yes! We offer 0% finance on all new boilers plus we offer options to spread payments making it easily affordable. Prices start from as little as £9.99 per month.

Yes! We can match any price from a reputable boiler installation company. A reputable boiler company is one that is a limited company that operates in the UK using gas safe registered engineers.

Don't just take our word for it

Nick T
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Billy and Joe plus another 3 arrived at 7am as agreed to replace a boiler, pump,6 new radiators, an all round central heating upgrade. The first job was carpet protection to all areas it’s refreshing to have professional tradesmen that respect your property, everyone new exactly the scope of works. The job was totally completed unwanted materials properly disposed of and all relevant documentation completed by 6pm. Billy oversaw every aspect. I was left with a fully commissioned system and our property was spotless. A highly recommended professional knowledgeable top notch company. Brilliant thanks to Billy, Joe the entire team excellent!
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They dealt with an issue at my mums house, came Bill came round 15 mins after first message was sent, understood the issue and arranged a time to come back. Both lads were professional, hard working, tidy and responsive. Would definitely recommend these lads to anyone looking for work to be done. Couldn't have wished for better tradesman.
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As usual bill did an excellent job. We have used him several times from full boiler installation to servicing. Quick, courteous and always on hand to answer questions, I can not recommend him and his team highly enough.
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Billy’s team installed new radiators throughout our house for us with the upmost care and expertise. Incredibly the floorboards afterwards looked almost untouched and the fittings were spot on. Brilliant work, would wholeheartedly recommend.
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Had old boiler, old storage tanks (hot&cold) etc removed and replace with modern combi boiler system. Quick, clean & efficient - 3 guys worked 13hrs and completed job in one day. Excellent service and great heating system.
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Great work very pleased with our new boiler. Guys worked very hard to complete in one day. Very tidy and professional would definitely recommend.
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Cosy boilers installed a new valiant boiler for us. Great service clean and tidy workers. Would use again and have recommended to friends.
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Billy and his team installed a new heating system in our home. Very happy with the work carried out. Will use again.
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