University of Salford & BEAMA TRV Energy House Report
16 April 2026
This report presents findings from the BEAMA Energy House Air Source Heat Pump (ASHP) Thermostatic Radiator Valve (TRV) Project undertaken at the University of Salford Energy House 1 test facility. The project was designed to assess the impact of TRVs on ASHP performance and inform future modelling of TRV use with ASHP systems.
Unlike gas central heating systems, TRVs are often omitted from ASHP installations based on concerns that they may reduce system efficiency and increase energy use. However, open-circuit design relies upon accurate sizing calculations and use of an appropriate weather compensation curve, neither of which can be guaranteed. Furthermore, open-circuit design limits occupant control and can lead to overheating in rooms with uncontrolled heat gains. Tests were therefore conducted to measure how trimming room temperatures using TRVs influences internal conditions, ASHP efficiency, and space heating energy consumption.