In replacing ageing boiler plant, Harrogate Grammar School has taken the opportunity to improve energy efficiency and reduce carbon emissions by installing a Hoval STU biomass boiler, backed by two UltraGas gas-fired condensing boilers.
Harrogate Grammar School is a co-educational, independent academy trust with around 1,700 pupils, including a large sixth form. The school has a strong commitment to minimising its environmental impact, so the near carbon-neutral status of biomass heating was an attractive proposition.
The new heating system was specified and installed by G&H Sustainability, which selected Hoval boilers because of their proven quality and reliability. The system comprises a 195kW STU wood pellet biomass boiler, two 350kW UltraGas condensing boilers and a silo for storing the locally sourced wood pellets. The pellet silo is equipped with a sensor to indicate when a further delivery of fuel is required.
“The system is configured with the STU as the lead boiler, backed up by the UltraGas boilers when required,” explained G&H Sustainability’s Andrew Hudson. “We expect the biomass boiler to meet around 80% of the space heating and hot water requirements throughout the year.”
One of the key challenges of the project was the availability of space within the small plant room. To facilitate installation, Hoval supplied the STU boiler in a “plug and play” skid-mount configuration complete with pumps, fans and fuel delivery augers, as well as the company’s FlameTronix touchscreen control system.
In implementing a biomass-led heating system, Harrogate Grammar School has reduced its carbon emissions considerably, compared with using fossil fuels, and is also eligible for additional revenue through the Renewable Heat Incentive.