Margaret Major, Managing Editor for Oil Installer recently attended a visit to Warmflow’s Lisburn manufacturing facility and shares her impressions of the trip.
Margaret Major, Managing Editor for Oil Installer recently attended a visit to Warmflow’s Lisburn manufacturing facility and shares her impressions of the trip.
In September, Oil Installer was invited to the headquarters and manufacturing facility of Warmflow, in Lisburn, Northern Ireland. The visit proved to be a well-orchestrated blend of hospitality, local culture and serious engineering, offering a rare behind-the-scenes look at one of the UK & Ireland’s leading heating-product manufacturers.
Arriving a day ahead of the factory tour, we were welcomed with lunch before boarding an open-top bus. A thoughtful addition to the itinerary, the tour of Belfast introduced the city’s rich industrial past, history through the Troubles, and evolution into a modern, vibrant capital. More than simply sight-seeing, it offered context for the region in which Warmflow has operated for over half a century. Dinner and informal networking rounded off a very warm welcome.
Factory tour: Engineering, innovation and culture The next day, we visited Warmflow’s Lisburn site for a tour of their modern manufacturing facility. The company’s ethos becomes immediately clear: innovation, engineering precision, environmental awareness, and commitment to both installers and customers.
Warmflow carries out full in-house design, manufacturing and fabrication and we saw modern panel benders, automated cutting and folding lines, robotic welding and efficient sub-assembly stations. The company prides itself on intelligent, repeatable production processes designed to improve accuracy, boost efficiency and reduce lead-times.
Warmflow’s portfolio includes high-efficiency oil-fired boilers, cylinders, warm air heaters, and a growing renewables range. During the visit we saw the full assembly process including rigorous performance testing.
A major highlight was the recent redevelopment of the Agentis oil boiler range. Driven by installer feedback and three years of focused R&D, the updated models now include over £250 worth of factory-fitted components that installers would previously have had to source and specify separately.
These include a pressure-reducing valve, shock arrestor, enlarged plate heat exchanger, increased expansion-vessel capacity, and Warmflow’s own Pro-Pack filtration. Integrating these into the manufacturing process and factory testing not only removes potential installation-stage error but also cuts more than two hours off a standard installation. The result is a slimmer, more efficient, AA-rated boiler that is easier to fit, simpler to service and significantly more cost-effective for installers and end users alike.
Sustainability is embedded in both Warmflow’s processes and product development. The facility generates its own electricity via a solar-panel system and recycles water used during testing. On the product side, a significant development is HVO readiness: all Agentis oil boilers are now HVO compatible with minor recommissioning, enabling an immediate and substantial reduction in carbon emissions. Warmflow’s investment in its Zeno heat pump range, further reflects its commitment to offering quality low-carbon alternatives for those transitioning from traditional fuels.
As impressive as the engineering, was the evident pride among the Warmflow team. Long-serving staff, disciplined quality-control and ongoing investment in automation all evidence a company that knows its strengths. Automation enhances consistency, while skilled craftsmanship remains where it delivers value.
Warmflow’s focus on being “installer-friendly” is clear – products are designed to be easy to install and service, supplied factory fitted with commonly required accessories and backed by strong after-sales support.
Throughout the visit the Warmflow philosophy came through strongly. Not only a manufacturer, the company regards itself as a partner to installers and specifiers:
The visit to Warmflow’s Lisburn facility gave a clear sense of a company that honours its heritage and customer focus while embracing innovation and sustainability. For installers navigating an evolving heating market, the reassurance of a forward-looking, technically excellent manufacturer is invaluable.
As the industry tackles decarbonisation and rising customer expectations, Warmflow offers a compelling approach: blending heritage with modern engineering, product robustness with environmental ambition, and manufacturing strength with installer partnership.
Beyond the manufacturing insight, the open-top tour, warm welcome and networking added a human dimension to the experience. Warmflow understands that relationships matter as much as manufacturing excellence, and this visit demonstrated both in equal measure.
Images from Warmflow / Margaret Major
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