A waterside property in Marlow, Buckinghamshire, has been fitted with a heat pump system from Danfoss Heat Pumps UK, which generates its energy from the River Thames. Mike and Doris Tucker had owned the character stone-built property for seven years and now, in retirement, decided to investigate ways to make the home more energy efficient and sustainable. This included replacement double glazing, improved loft insulation and a high efficiency heat pump. Tucker, a qualified engineer, previously used LPG gas, as the property is not on mains gas. Over the past two years, with significant LPG price increases, set to continue  into the future, he decided it was time to act.  He found heat pump installer Geothermique during an internet research on heat pumps and local installers, and was impressed when they came  to survey his property, the resulting survey results and savings projections.