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London's largest private residence employs heat pump technology

Ground source heat pump technology is being employed at London’s largest privately owned residence, where it is set to save the owners £40,000 a year in energy bills.

The grounds at Witanhurst, which costs £100m including restoration and boasts 65 rooms, will incorporate 390ft boreholes which will harness the earth’s natural warmth to provide heating and air-conditioning.

Said to be similar to the arrangement employed at Buckingham Palace, which draws water for the A/C system in the Queen’s Gallery and the wine cellars, the system works by circulating water through a network of pipes running deep below the ground where it absorbs the earth’s warmth – a constant 8C-13C.

This is then passed up into the heat pump, which raises the temperature to 55C-60C.

Borehole technology is said to have also been employed at properties owned by Sir Elton John, and Paul Allen, the co-founder of Microsoft.

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