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Clearly the hotter the home, the more fuel used, I am not talking about that, what I am talking about in the main, is the latent heat extracted from flue gases, and the effect of sine wave temperature control.


We have been shown the diagrams for years, also the circulation diagrams 
and the argument as to where the radiator and the thermostats should be placed. And I know due to getting it wrong, it does matter, but the theory can't always be done in practice, putting the radiator against an internal wall reduces losses through the wall, but then one is left with any wall thermostat being on an outside wall.
The whole idea of the TRV seems great, but with modern electronic TRV heads, we see the temperature it sees, which are often much lower to what a wall thermostat sees. Double-glazed windows now have larger gaps, and are much improved, we add loft insulation, cavity wall insulation, and the home it nothing like it was when built, and central heating installed.
Boilers have been changed, often in the case of gas to a modulating type to help extract latent heat, then fitted with a thermostat using mark/space control completely upsetting the control built into the boiler.
But the question is, how much will getting the control wrong, really cost? Or the other way around, how much with OpenTherm and the like control save? Also, rather simple things like raising butt hinges. We have rooms in our homes, how much will closing the doors between rooms, help on reducing heating costs?
We have rooms which are not used much, and we will turn down the TRV in those rooms, but then leave the door open. But get some thermometers and place them around a room, and one can see the temperature variation even in one room can be 6ºC. With bay windows and morning sun, even more.
As to what feels warm, sometimes 18ºC seems warm, other times feel cool at 22ºC, I find I want it cool at night, 16ºC when in bed is ample, on arising I want it warmer, maybe 19ºC, but come the evening, want it warmer again around 21ºC, so response time becomes a problem, and the times I have felt cold, only to hear minutes latter the boiler fire up.
Also, there is the room which always seems cold, is it worth running a whole central heating boiler, to heat one room?
And warming rooms when energy is cheap, rather than when needed. This more down to electric, but combined power is an option.
I have always considered having something like Drayton Wiser and each room independently controlled was the bees knees, but @Mister Banks tells us
But when someone rips out the control, one has to ask why, has the modern control gone OTT.





The whole idea of the TRV seems great, but with modern electronic TRV heads, we see the temperature it sees, which are often much lower to what a wall thermostat sees. Double-glazed windows now have larger gaps, and are much improved, we add loft insulation, cavity wall insulation, and the home it nothing like it was when built, and central heating installed.
Boilers have been changed, often in the case of gas to a modulating type to help extract latent heat, then fitted with a thermostat using mark/space control completely upsetting the control built into the boiler.
But the question is, how much will getting the control wrong, really cost? Or the other way around, how much with OpenTherm and the like control save? Also, rather simple things like raising butt hinges. We have rooms in our homes, how much will closing the doors between rooms, help on reducing heating costs?
We have rooms which are not used much, and we will turn down the TRV in those rooms, but then leave the door open. But get some thermometers and place them around a room, and one can see the temperature variation even in one room can be 6ºC. With bay windows and morning sun, even more.
As to what feels warm, sometimes 18ºC seems warm, other times feel cool at 22ºC, I find I want it cool at night, 16ºC when in bed is ample, on arising I want it warmer, maybe 19ºC, but come the evening, want it warmer again around 21ºC, so response time becomes a problem, and the times I have felt cold, only to hear minutes latter the boiler fire up.
Also, there is the room which always seems cold, is it worth running a whole central heating boiler, to heat one room?
And warming rooms when energy is cheap, rather than when needed. This more down to electric, but combined power is an option.
I have always considered having something like Drayton Wiser and each room independently controlled was the bees knees, but @Mister Banks tells us
It seems he has more info as to how the heating is working to me, Google Home allows me less not more control to the thermostats own app.On my Wiser system I now only have a single room thermostat having now removed all the Wiser TRV’s and replaced them with manual TRV’s.
But when someone rips out the control, one has to ask why, has the modern control gone OTT.