Plas Newydd
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Plas Newydd: Heat from the sea to warm historic house

22 May 2014 Last updated at 17:48 BST

Heat from the waters of the Menai Strait will be used to heat a historic north Wales mansion in a bid to cut costs.

The new heat pump at Plas Newydd relies on a heat exchanger, which uses a system similar to refrigeration to amplify warmth from pipes in the sea.

The 300kW marine source heat pump cost the National Trust £600,000 and is expected to save around £40,000 a year in operating costs.

BBC Wales environment reporter Iolo ap Dafydd reports.