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Baystar and GeoScience were approached by the internationally renowned education facility to lead a project involving the designing and installing of a retrofit 400kW ground source heat pump with back up boiler and LPG boiler.

The heat pump was designed to deliver 95% of the load. A ground source heat pump was installed for the main building and the swimming pool area through a quasi-district system that distributed the low energy heat from a central collector to the heat pump plant located in the different buildings.

As well as providing all heating and hot water (including the leisure facility), the system is now bringing in a substantial annual income from the Government Renewable Heat Incentive (RHI) scheme. It has halved the heating energy costs for the estate and provided a 60% Carbon reduction.

Roffey Park


Baystar along with GeoScience were responsible for designing and installing a retrofit 120kW ground source heat pump with back up oil boiler. The heat pump was designed to deliver 80% of the load.

A ground source heat pump was installed for the main building utilising the lake on-site as the heat source. Baystar carried out a full feasibility study incorporating additional buildings but the cost benefits did not stack up and carbon savings was a key consideration.

The study involved assessing the annual load profile and estimating the percentage of the heat pump. Various operating scenarios were considered to enable the size of system to be selected and an assessment made to ensure we had the required volume of water within the lake.

St Cuthmans


A 90 kW cascade system of heat pumps using 18 loop lake collector was installed at this working equestrian estate to provide fuel security, reduce heating costs and provide income from the Renewable Heat Incentive (RHI) scheme.

The system was to provide heating and hot water for 5 buildings using a cascade system, with a back up boiler for the legionaries purge. By utilising the lake, the owner hoped to become more self-sufficient, and to maximise their fuel cost savings.

“Great system, completely invisible and a real talking point for guests. Fantastic hot water production and extremely low maintenance. RHI incentive makes the scheme incredibly profitable and worthwhile both environmentally and financially”

Tattleton Estate


GeoScience worked with the National Trust to deliver a water source heat pump at Anglesey Abbey in Cambridge.

The water source heat pump extracts water from Quy Water, which runs along the boundary of Anglesey Abbey. Between 1 and 3 degrees is extracted from the water, before returning it to the river further downstream.

The design uses six heat pump units cascaded together to provide over 200 kilowatts (kW) of heat to the building’s radiator systems. The heat pumps will generate around 187 Megawatt hours (MWh) of heat energy each year removing the need to use 32,000 litres of oil per year and reducing our CO2 emissions by around 43 tonnes a year. Anglesey will save around £7,000 on fuel bills each year in addition to generating an income from the Government’s Renewable Heat Incentive scheme.

Anglesey Abbey

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