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@JimCrow. Bypass valve set to about 4.5

Thank. @JimCrow that pipe is out the the bathroom towel rail. @ericmark I will check that as it would make sense to increase the resistance in the Ch loop to encourage the flow upwards to the hw coil

Thanks both. It is a recent move of the tank from the bedroom to the attic, you can just see the ring from the old vented tank on the bottom of the pic. So tank used to be same level as pump I guess this could be an extra demand on the pump so it is not keeping up. I have tried to up the...

Hi Ian, boiler is a worcester bosh greenstar pipe arrangement is in photo hope it maes sense

Hi all, I have a S plan central heating system, boiler on ground floor, unvented tank in the attic (2nd floor) . The pump is currently in a bedroom on the first floor. If I switch on the heating only, water flows and radiators heat up. If I switch on the hot water only the hot water flows up...