TRV + Room thermostat - Why?

[john999uk]

So I am not a plumber but have reasonable technical mind.
Can anyone explain why have a 'room' thermostat and TRV?
For example, our bungalow has 5 rads with TRV and the one in the bathroom no TRV, plus we have a 'room' thermostat in the hall.
If the hall TRV is set lower than the room stat, the stat will never demand boiler off. If the hall TRV is set higher the room stat could switch the boiler off when temp isn't warm enough in rest of the bungalow. So what is the point of the room stat?

Thanks for any help.

 

[Chalked]

As trv's do not have control over the boiler, it needs a room thermostat to do this. Think of it as an upper limit of your house temperature. Trv's are slow to react to temperatures especially on a warm day straight after a cold one. The house may be over heated, wasting energy.
Gas safe mandates that your radiators in the reference room ( the room with the thermostat) must not be fitted with a trv.

 

[Chalked]

As trv's do not have control over the boiler, it needs a room thermostat to do this. Think of it as an upper limit of your house temperature. Trv's are slow to react to temperatures especially on a warm day straight after a cold one. The house may be over heated, wasting energy.
Gas safe mandates that your radiators in the reference room ( the room with the thermostat) must not be fitted with a trv.

 

[Riley]

Idea is that you put the thermostat in the coldest part of the house and then you can control each room using TRVs your house will never get up to temperature reliant on TRVs alone. Your TRVs don't actually turn off the boiler so it will just run until you turn it off so you will find a thermostat TRV combination far more efficient, just don't have a TRV in the room with the thermostat otherwise they will fight against each other.

 

[john999uk]

Thanks guys. I was thinking that the stat would be fighting the TRV.
This expertise is why we have trained plumbers.

So stat in coldest room and no trv in that room. Thanks.

 

[john999uk]

Thanks guys. I was thinking that the stat would be fighting the TRV.
This expertise is why we have trained plumbers.

So stat in coldest room and no trv in that room. Thanks.