I'm thinking of zoning my heating system and have a Viessmann 200-W boiler. One option would be to site the motorised valves close to the boiler (and the control unit) but the potential downside to this appears to be the potential to close off all of the rads and have no where for the heat to go when the boiler is on pump overrun. So, two questions:
I) if all of the rads are shut off have I got a problem?
II) should I consider locating one of the motorised valves after a radiator to enable heat to be circulated through it when on overrun?
Thanks.
I) if all of the rads are shut off have I got a problem?
II) should I consider locating one of the motorised valves after a radiator to enable heat to be circulated through it when on overrun?
Thanks.