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Warmflow Engineering Co Ltd

Warmflow Engineering Co Ltd

3.9(79 reviews)See reviews ↓·Belfast

About the company

Warmflow Engineering Co Ltd is a family-owned heat pump installer based in Belfast. The company was founded in 1968 and has over 50 years of experience heating homes across the UK and Ireland. Warmflow manufactures oil fired boilers, hot water cylinders, and renewable technologies including ground source and air source heat pumps. It operates a 150,000 sqft production facility in Lisburn, Northern Ireland. The company serves Northern Ireland, Great Britain, and the Republic of Ireland.

What customers say

Based on genuine customer reviews

Warmflow Engineering Co Ltd manufactures boilers in Lisburn, and the products, which include heat pumps, attract steady approval from installers and homeowners alike. Craftsmanship is a recurring theme, with the build arranged around the practical needs of the trade, from a choice of pipe routes to sensibly positioned knockouts that reach down to the base panel. The Pro series is singled out for arriving with the essential accessories already in place rather than adding cost later. Aftercare draws similar praise, one long-standing fitter ranking it above the support offered by other makers.

Named engineers Lou and Gavin are credited with commissioning an AS03-290 heat pump and an HP290UV cylinder, taking care to explain the setup and staying on hand for questions. Households with underfloor heating in new builds report a warm house and simple operation. An observation shared by more than one reviewer is the willingness to take installer feedback on board and revise designs, with trusted components such as Grundfos pumps and Riello burners fitted inside the units. Local manufacturing is another factor customers value, alongside a proper response when problems arise after installation.

Boiler manufacturer
Warmflow Engineering Co Ltd — Customer photo
Warmflow Engineering Co Ltd — Customer photo
Warmflow Engineering Co Ltd — Customer photo
Warmflow Engineering Co Ltd — Customer photo
Warmflow Engineering Co Ltd — Customer photo
Warmflow Engineering Co Ltd — Customer photo
Warmflow Engineering Co Ltd — Customer photo
Warmflow Engineering Co Ltd — Customer photo

Reviews

Reviews are taken from publicly available sources.

DG
David Gravelle24 June 2026

I was invited with a group of heating engineers to visit the factory in Belfast and as an engineer myself I was very impressed with not only the product itself which I found has a much greater build quality than its competitors. Not only that but the ethos and attitude of the company was also pragmatic, helpful and very professional. I must admit being based in mainland Uk I wasn’t familiar with the product before hand but pleased to say that I have ordered a kit from them for our next install. Great quality, good price with good support 👍

DJ
Dylan Jones22 June 2026

Lou and Gavin came to set up and commission our install a Warmflow AS03-290 heat pump warmflow HP290UV cylinder and provided an excellent service. They took the time to explain everything clearly and thoroughly, making sure we understood how the system works and what to expect. Their knowledge, professionalism, and attention to detail was outstanding. Very informative throughout the whole process and happy to answer any questions. We're very pleased with the service received. Thanks, Lou and Gavin! Highly recommended.

RH
Rob Hawkins11 June 2026

5 star 🌟 service from Mr Gavin Thomas from Warmflow . I have built up a good working relationship with Gavin over the years, i can honestly say he’s one of the best out there with his customer relations and support . He answers any enquiries efficiently without delay and his products knowledge is fantastic . I’ve recently fitted my first Warmflow Cylinder , on the whole a very postive experience. A lot of thought has gone into the design and they clearly have the installer in mind. One small negative I had was that the Cold Water Combination Valve and the location of the Expansion Vessel connection. Unless I’m overlooking something , then the valve can only be installed in one particular direction, as the “tapping “ for the vessel is on the front of the valve , so it can be fitted horizontally on a wall from right to left , however not from left to right as the “tapping “ then gets fouled by the wall unless the who valve is spaced off the wall a number of inches to allow for a fitting /attachment . I appreciate that may be a bit tricky to follow , I’ve explained the best I can . Not a big issue if you know about it , and I’ll be more prepared next time if this particular valve is still specified within the components pack . On the whole , a very good experience and I would definitely be looking to install one of these units in the future .

WP
Will Pierce2 June 2026

Installed a warmflow e43 external last week. Really impressed with the quality and ease of Installation. It has a riello burner which is really easy to setup. It heated the house in no time considering it was a converted barn with around 30radiators in total. Customer service is great, Lou the rep always goes the extra mile to help you out and really knows his stuff if you have any queries. Excellent service and I look forward to installing the next one

LM
Linda McElduff24 May 2026

We recently installed a Warmflow boiler for the underfloor heating in our new build house and are very pleased with it. The house is always warm and the boiler has been easy to run.

WG
Willie Gill12 May 2026

Did a warranty repair call out for this company few months ago and still not paid their invoice. Do hundreds of warranty call outs for Grant Boilers and never a problem with payment. Fitted 3 of their oil boilers following false promises from their sales rep and deeply regret doing it. Beware when installing their products as they are a nightmare to deal with when the customer calls with issues. AVOID!!

LC
Liam Couch26 March 2026

We recently used Warmflow for a boiler upgrade project, and the experience was seamless from start to finish. From our initial contact with the local representative through to installation and final sign-off, everything ran smoothly. We’ll definitely be installing more of their products in the future.

Heat pump installers in Belfast compared

Ordered by rating, weighted by the number of reviews — businesses with only a handful of reviews do not jump to the top automatically. 6 businesses in this category in Belfast are compared.

RankProviderRatingReviewsOpen Sat.
1Daly Renewables Ltd.★ 5,020No
2Belfast Heating Ltd★ 5,017No
3Source Air Conditioning★ 5,04No
4Sharpe Mechanical Services and Sharpe Ventilation Services Ltd★ 4,73No
5Tri-power Environmental Energy ltd★ 4,512No
6Warmflow Engineering Co Ltd (this page)★ 3,979No
Contact
+442892621515www.warmflow.co.ukLissue Industrial Estate, Moira Road, Lisburn BT28 2RF
Working hours
Monday08:00–16:00
Tuesday08:00–16:00
Wednesday08:00–16:00
Thursday08:00–16:00
Friday08:00–16:00
SaturdayClosed
SundayClosed