The first ever Renewable Heat Incentive accredited system was a 26kw water source heat pump which heats a 750m² office development in Yorkshire. A report published by the Department of Energy and Climate Change on 11 February 2016 showed that it was also the most efficient of those monitored by an independent consultant. The one year study, which looked at both the efficiency of the heat pump and the efficiency of the whole heating system, revealed that the system installed by Earthtest Energy for Booth Brothers (Printers) Ltd was a huge 70% more efficient than the mean performance of the other systems monitored, and beat its nearest rival by 20%.

The report concluded “that it is possible to design, install and operate heat pump systems that provide a high seasonal performance factor, but that this high level of performance is not being realised on some installations”.