A sustainable heating solution for Mottisfont

Two biomass boilers being installed at Mottisfont, Hampshire

An energy efficient, environmentally friendly biomass heating system has been installed at Mottisfont.

The new system has been installed by building services engineering company Baystar. It will provide heating and hot water to the house, and a connection is also being installed for the stable building.

The café, offices and the second-hand bookshop which are housed here will benefit from biomass heating once a wet heating system has been installed to these areas, which is due to take place within the next 18 months.

Why is this important?

The biomass system will remove our dependence on oil and generate the 307,000KWh of energy required to heat the house and stable buildings. This will save around 90 tonnes of CO² and almost £13,000 per year against current heating costs.

The Welcome Centre, which opened to the public earlier this year, is already heated by its own biomass boiler.

The project

Our old cart shed, located in our staff car park, has been converted into a state-of-the-art biomass boiler house. It has been built using locally sourced timber, so that it blends in with the look and feel of the other buildings on site.

Two 100Kw biomass boilers are now housed here, which will be fuelled by the woodchips from an adjacent store. 

The boilers heat water stored in a 5,000 litre buffer tank within the new boiler house. This water is then piped to newly installed heat exchangers in the mansion and stables via the district heating system.

The heat exchangers are connected to the heating system within each building, and as the hot water passes through them the heat is passed from the district heating system to the heating system within the buildings.

The water will then flow back to the boiler house so that the process can be repeated. When water is heated it expands, so an expansion tank will also be installed in the shed to deal with this increased volume.

The short-term plan is for locally sourced woodchip to be used to power the boilers. In the long-term, waste wood sourced from the wider estate will be used as fuel.

A new pipe network has been installed to contact the biomass boilers to Mottisfont’s buildings. Trenching work started in the grounds in early October, carried out in six phases, each lasting about a week.

This was carefully planned to affect the visitor route as little as possible, with only small sections blocked off at each phase.

A careful installation process

Baystar liaised with archaeologists and site staff and ensure Mottisfont’s sensitive buildings and grounds were maintained and unaffected by the works.

Some items of interest were discovered during the trenching process, mostly dating from the nineteenth century, including a button that appears to have fallen off the livery of a visiting footman.