Barrington Court is a Grade II listed heritage house from the 16th century, once owned by the Lyle Family (Tate & Lyle sugar) but now owned by the National Trust.

This picturesque estate sought to significantly reduce its environmental impact through lowering its carbon emissions and decreasing risks associated with potential oil spills. In order to achieve this, Dunster replaced their existing oil system with an eco-friendly, energy-efficient Fröling biomass system.

Fuel Supply and Pellet Handling

Wood pellets are supplied through the National Trust’s fuel supplier, delivering through a bulk blown delivery tank directly into the fuel store.

The bespoke pellet store is moisture protected and designed to be durable, constructed with structural timber and then internally clad with phenolic ply to assist with pellet movement. To ensure the utmost safety, store walls have also been constructed with a material, which provides a one-hour fire barrier. Additionally, pellet handling is made easy by the access door, slated entry system and two viewing panels on the store.

System Design and Installation

The system was designed, using our in-house CAD team, to supply 100% of the estates heating and hot water needs. Each stage of the installation was carefully planned, from the construction and groundworks to customer training, ensuring reliability, longevity and fault-free operation. Dunster undertook all the pipework, with the entire site being fully networked, ensuring that all boilers and controls can be managed remotely. All pumps and controls were upgraded to modernise the heating system and increase efficiency across the heat network.


Compared to the previous oil heating system, the biomass scheme is much more energy-efficient and cost-effective, providing a cleaner, greener source of heating.


March 2016


Supply of heating and hot water to Barrington Court and surrounding buildings.

Boiler and Plant

Combination of two Fr0ling P4 105 boilers, giving an output of 210 kW, linked to two 2,500 litre Galu buffer tanks. Existing oil boilers were completely removed. The plant room was tailor-made with minimal disturbance to the fabric of the buildings.


The boilers are expected to use around 150 tonnes of wood pellet, producing over 525Mwh of heat per annum.

Pellet Storage

Dunster designed and constructed a tailored pellet fuel store. The fuel store has a total volume of 29.3 m3 and holds up to 19 tonnes of pellet, optimising fuel delivery.

Grant / Funding

The system was funded by the National Trust as part of their Renewable Program and is accredited under the Non-Domestic Renewable Heat Incentive scheme.

Savings / Investment

Switching from oil, the property is saving on energy bills and removing 94 tonnes of CO2 emissions. Additionally, the income from RHI payments will pay off the capital expenditure of the system.

CO2 Saving

Compared to oil heating, our wood pellet system reduces CO2 emissions by over 95%.

We are really pleased with our three ETA boilers installed by Dunster Biomass. Their service has been very professional and their engineers are knowledgeable, proficient and accurate. They are always sympathetic and accommodating to the many constraints that come with installing a scheme in a visitor attraction set within a historic landscape.

Oliver White, General Manager, Hestercombe Gardens