23 June 2004
Heat pump systems are reliable. This is the conclusion that can be drawn from a Swiss project involving field measurements of 237 heat pump systems between 1996 and 2003. Average availability was 99.5 %, with over 70 % of the systems operating without any faults at all. The project investigated the performance of domestic heat pumps of standard type, abstracting heat from various sources and connected to different types of heating systems.