Media playback is unsupported on your device

The National Trust house that is heated by sea water

22 May 2014 Last updated at 06:01 BST

With fears over Russia's hold over gas supplies, Europe's governments are seeking methods to heat homes and businesses that do not rely on gas.

The National Trust is unveiling a new project on Thursday to suck heat from the sea to warm one of its historic homes in North Wales.

It uses a similar technology to refrigeration.

BBC Environment Analyst Roger Harrabin reports.

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.