Stuart G asked ... C3 Front Wiper control problem?    |    Clare S asked ... Repair Electriq dehumidifier?    |    Bob asked ... Charger fault?    |    Terry nelson asked ... How to remove the flexible shaft from a curved shaft ryobi t?    |    Matt Longmore asked ... Non-start on Flymo XLT 250?    |    Click here to ask your question

Circulator pump. Can water pass through it when the pump is switched off?

Does a central heating water pump itself prevent water flowing through to the radiators by gravity? This may seem a daft question, but it relates to changes suggested for a continental system which currently has a mixer valve operated by external temperature which is to be replaced by a room stat/programmer.
Chas, March 2009
some now have built in check valves

old guy, March 2009