Does a combi boiler need a bypass valve?
Simply so, does a system boiler need a bypass valve?
Bypass valves are valves fitted to heating systems between the boiler and the radiators. An auto bypass will then begin to open as the system water pressure is increased due to low flow through the heating circuit. Automatic bypass valves are adjustable to allow for correct flow rates required by boiler manufacturers.
Just so, what does a bypass valve do?
A bypass valve is different from a blow-off valve because it doesn't vent any air to atmosphere. Instead, it recirculates the air back into the intake before the turbo or supercharger inlet, but after the airflow sensor. “A bypass valve is typically a recirculation valve.
You should have thermostatic radiator valves (TRVs) on all radiators but not in the same area as a wall thermostat, it is possible that this room may never get warm enough to turn the boiler off via the wall thermostat if the temperature in this area is being controlled independently by a TRV.