Ground Source Review: Caerphilly Castle Visitor Centre October 7, 2014 Caerphilly Castle is one of the great medieval castles of western Europe. It is the largest castle in Wales, the second largest in Britain (second to Windsor Castle) and is one of the largest fortresses in Europe. It was built mainly between 1268 and 1271 however its modern visitor centre built in 2002 uses modern technology to meet its high environmental credentials. This visitor reception building at Caerphilly Castle is heated using a heat pump and renewable energy from the castle’s surrounding moat. The adjacent moat not only acts as a heat source during winter, but also disperses unwanted heat from the building in the summer when the heat pump is configured for cooling. In heating, a water pump moves moat water int

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