Understanding room thermostats, saving on heating

[Harry Bloomfield]

I just find it hard to get round the idea of controlling the temperature of all rooms based on one room, in a house where I want the rooms at very different temperatures (not even throughout). I only want to heat the rooms I'm in/using.

You cannot turn the room off, where the thermostat is located, but you can turn the TRV's down in the unused rooms. Alternatively, if it's a wireless stat, you could carry it to which ever room you are in, and set the TRV in that room to maximum.

You should never turn TRV's completely off, otherwise in freezing conditions, there is the risk of pipework and radiators freezing.

I switched because I had very poor hot water flow upstairs.

I'm surprised you have more flow from a combi, than you had with stored HW - it suggests it was wrong plumbed, or you had a restriction somewhere.

 

[fixitflav]

I'm surprised you have more flow from a combi, than you had with stored HW - it suggests it was wrong plumbed, or you had a restriction somewhere.

Why a surprise? The flow depends on the mains pressure and the height of the CWST. Sounds like the CWST is on the low side and can't be raised, so more often than not mains would be better. But it should have checked to make sure the change is worthwhile.

 

[Millstone]

The old system had a clock that meant I could set the boiler to come off/on at certain times of day. It was only 24hr -not 7 day - that was a defect. But other than that I could simply switch the heating off. As well as controlling all rooms via valves on the radiators when it was on. So I either had the heating off completely, or heating on with all valves turned down except in rooms I was using.

 

[Harry Bloomfield]

Why a surprise? The flow depends on the mains pressure and the height of the CWST.

Because the flow from the combi, is limited by its ability to heat the water fast enough. My CWST, is mounted directly above the bath, floor mounted in the loft, fed with 22mm. I have an extremely good flow at the hot tap.

 

[fixitflav]

Because the flow from the combi, is limited by its ability to heat the water fast enough.

He didn't give the combi output, but they're usually around 30kW, enough to give reasonable HW flow, or what's the point? Unlikely that's the reason for the low flow.

My CWST, is mounted directly above the bath, floor mounted in the loft, fed with 22mm. I have an extremely good flow at the hot tap.

Same here!