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Boiler Pump safety?

Cemil2565
By Cemil2565
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Hello, I have a vaillant vcw 346 5-5 ecotec plus E-BE R6 , it is hooked up to Tado smart thermostat by cable, there's is 9 radiators but 8 of them is hooked up smart valves and 1 normal trv valve, there can be only 1 radiator running and others closed,sometimes all closed, when heating demand is off when all valves closed, the pump runs a little time until shutdown, is it bad to close all radiator valves or only open 1 radiator valve for the pump?

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