Can I fit Thermostatic Radiator Valves (TRV) on all radiators in the house?
New houses may have this, because of new housing regulations. However, existing older systems will not usually have an AUTOMATIC BYPASS (PRESSURE BALANCING) VALVE, or ABV fitted to the system.These are required to cater for the possibility that the majority of radiators are closed off due to low TRV settings, but high room thermostat settings keeping the boiler cycling. Since the circulating pump would still be running, the pressure in the system would increase. An ABV would automatically to keep the pump pressure constant. An ABV is usually fitted as close to the pump as possible, across the flow and return pipes. NOTE: the room where the room thermostat is fitted (usually a hallway), should NOT have a TRV fitted to the radiator in that location (to comply with BS5449), nor should any thermostat be directly above any radiator. Obviously either situation would make the room thermostat sensing inaccurate. Ideal places for TRVs are small rooms such as cloakrooms and bathrooms, and say 50
