Hi all,
I've recently installed a smart heating system (Evohome) which uses TRVs to control each radiator independently. I've put an Evohome TRV on all the radiators, including the bathroom radiator which was previously fitted without a TRV to act as a bypass radiator.
The idea is that Evohome tells the boiler to fire whenever more than one TRV calls for heat, and turns the boiler off when none of the TRVs call for heat. Therefore in theory, there should be no need for a bypass rad.
I've noticed however that when the last TRV switches off, there is a short delay before the boiler itself turns off. In that time, as soon as the last TRV closes, the boiler starts making a load groaning noise - I can't work out where from exactly but it doesn't sound too happy. I'm assuming it's the pump making this noise, caused by the hot water having nowhere to go.
I was under the impression that a modern combi boiler (Glowworm Ultimate) would have an automatic bypass fitted, and therefore there would be no need for a dedicated bypass radiator?
I could solve the problem by reverting the bathroom radiator back to being permanently on, but I'd rather not if possible.
Thanks,
I've recently installed a smart heating system (Evohome) which uses TRVs to control each radiator independently. I've put an Evohome TRV on all the radiators, including the bathroom radiator which was previously fitted without a TRV to act as a bypass radiator.
The idea is that Evohome tells the boiler to fire whenever more than one TRV calls for heat, and turns the boiler off when none of the TRVs call for heat. Therefore in theory, there should be no need for a bypass rad.
I've noticed however that when the last TRV switches off, there is a short delay before the boiler itself turns off. In that time, as soon as the last TRV closes, the boiler starts making a load groaning noise - I can't work out where from exactly but it doesn't sound too happy. I'm assuming it's the pump making this noise, caused by the hot water having nowhere to go.
I was under the impression that a modern combi boiler (Glowworm Ultimate) would have an automatic bypass fitted, and therefore there would be no need for a dedicated bypass radiator?
I could solve the problem by reverting the bathroom radiator back to being permanently on, but I'd rather not if possible.
Thanks,