Bronllys Hall to be heated using HVO boiler

Bronllys Hall in Powys, Wales, is to be heated by a system using vegetable oil, solar, wind, batteries – and a Megaflo cylinder.

The transformation of the Victorian mansion in Powys is believed to be the first time this heating solution has been fitted into a UK events venue.

Work underway at Bronllys Hall, parts of which date back to the 18th and 16th centuries, will create 40 ensuite bedrooms and various entertainment areas. Hughes Architects, the conservation architecture specialists who are managing the Bronllys project, teamed up with Suffolk-based Hounsfield Boilers to tackle the challenge.

The systems integrators for Bronllys Hall, working with a local plumbing company, have connected Hounsfield’s UK HVO boiler technology into a thermal storage system provided by Baxi. Manufactured in the UK, the Megaflo 1,000-litre cylinder is highly insulated to achieve low heat losses, constructed of duplex stainless steel for longevity, and maintenance-free with no sacrificial anodes.

Richard Whittington, technical sales manager at Baxi, said:

The very low heat losses of our Megaflo hot water cylinders, their renowned quality and reduced carbon footprint dovetail perfectly with the carbon neutral aims of this project as well as meeting the requirements for a long-term low-maintenance solution. We are extremely proud to be playing a part in this ground-breaking sustainable events venue which exemplifies UK innovation at its best.

Doug Hughes, principal architect and managing director of Mid Wales-based Hughes Architects, said: ​​

Along with our other partners in this expansive project, Hounsfield’s technology and Oil4Wales’ logistics enable HVO heating to work at scale with high availability – another step in creating a fully sustainable historical building alongside our work with battery technology from Brill Power, whose battery management system will extend the lifespan of the building’s battery system. The batteries are charged by sustainable sources, with minimal reliance on renewable power from the grid.

HVO is a highly effective way to solve the difficult issue of decarbonising heating, with options to scale for the future and deliver on our collective commitment to sustainability. This approach not only gives incredible projects like this a competitive edge through delinking from carbon-intensive fossil fuels and their price swings, but also adds further to its core eco credentials, aligning with the team’s sustainability targets.

Andrew Hounsfield, founder of Houndsfield and a trailblazer in the field of HVO heating, said:

We have been producing HVO-ready boilers for a few years now, with a focus on long life through quality British-made parts.

Energy prices remain stubbornly high (although the price of HVO has been stable). We need to decarbonise and HVO provides a sustainable green energy source. Adopting this fuel more widely will reduce our reliance on foreign fuel.

Although HVO is produced from 100% sustainable resources, is low carbon and reduces emissions, it is still being taxed as road diesel, due to the way it is distilled, and that attracts a 57.95ppl duty as a result.

Sally Williams from Oil4Wales commented:

The cost of HVO is currently about twice the price of heating oil. If the government were to reduce the tax this would drive demand and enable the industry to make economies of scale, bring the price down, and boost uptake of HVO as a low-carbon heating fuel.

Converting from Kerosene to HVO can be very cheap and easy. Some boilers may require more costly modifications or replacement.

Baxi will be at InstallerSHOW 2024, taking place 25-27th June at the NEC. More info: