Flow pipe hot, return cold - is this right

[pistonheadforum]

Thanks - i'd not thought of that but that makes complete sense! Setting is low to stop the hot water scalding so will be careful about adjusting it as it will increase the temp at the hot taps.

The whole thing needs a refresh I think so planning for this when the weather changes and I can have it off to be worked on.

Reading up a lot of folk talking about unvented systems as the best way forward? Is this right? Surely this would put a bit of stress on the old piping? I'd be reluctant to do this without a compelling reason.

Is unvented more efficient and if not why is the traditional gravity F+E vented not used so much? Is it purely to elimitate the F+E tank in the loft (which I have plenty of space for)?

Thanks in advance to all for advice.

[anonymous-user]

What numbers are set on the TRV's? Are they set at max or somewhere between min and max?

If adjusting the TRV settings (higher number) makes no difference to the room temp then I would suggest the heat output from the boiler is set too low. If the TRV's are already at max then more heat is needed from the boiler which will consume more gas i.e. bigger bill.