Is this article a Red Haddock ???

JohnW2 said:
I agree, but ....

... if I understand correctly there are now some 'regulations' (I don't know their 'status') calling for 'zoning' of heating, and that that is usually achieved with wall stats in each zone. Is that not the case? (not that I personally care - I'm happy with what I have, regs or no regs :-) )
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That's basically what TRVs do
 
JohnW2 said:
It is - but (speaking from relative ignorance) the impression I get is that 'the requirement' is not satisfied by TRVs alone. Hopefully someone knows something about this, and can tell us.
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It all depends on the TRVs, mine most certainly not but some are fully programmable using the app form the other side of the world.
 
morqthana said:
The room I am in now has 3 radiators. .... So you think that if I want to change the temperature it is not better to only have to adjust one wall stat than it is 3 TRVs.
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That's fine if you have a wall stat it every room (but then you wouldn't need TRVs, anyway!).

... otherwise, I might have to be asking you whether you thought it would be better to adjust the wall stat (in the room in question) and also (by guesswork) the TRVs in all other rooms than to adjust the TRV(s) in just the room whose temp you wanted to change - and even that would presumably only be possible if you wanted to increase the temp in the one room (to above that of the wall stat, somewhere)?
 
SUNRAY said:
No need for there to be one without a TRV.

If every rad could call for heat independantly... why would there be a wall stat?
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My understanding, from a Heating Engineer is that with TRVs a Room Stat is still required and is used as a "High Limit Stat".

Edited a PS - at least that positions as was explained to me a few years back anyhow.
 
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JohnW2 said:
... if I understand correctly there are now some 'regulations' (I don't know their 'status') calling for 'zoning' of heating, and that that is usually achieved with wall stats in each zone. Is that not the case? (not that I personally care - I'm happy with what I have, regs or no regs :-) )
Click to expand...
What one needs to remember is a TRV is a thermostat, it depends on where one reads as to if it needs a timing element, but the electronic TRV does have a timing element, so there is no need for any wall thermostats or programmers, the electronic TRV head can do the lot, which is what the Honeywell EvoHome did and still does all those years ago.
EVO-home1.jpg
Today there are others, like Wiser which do the same, but we seem to have lost the non-smart phone control, to access my TRV heads requires me to bend down at the radiator, Kasa (TP-Link) do a wall sensor that can be linked to the TRV, and Energenie have very little control without computer of smartphone, the eQ-3 you can do all manually at the TRV head, the Bluetooth to phone, just saves one bending down.

But the idea of being able to see what the heating has done through the day 1769250949398.pngmust help when trying to work out failings. The Wiser version records from the internet outside temperature as well 1769251217343.pngI have removed a section to make picture smaller, it shows thermostat setting, room temperature, and outside temperature but it does not help with an install where one has no idea of the pipe run, which is all micro bore, so there is around a 20 minute delay from boiler turning on to radiators getting warm.

Whatever controls I add, I still have an on/off 20 kW oil boiler nearly 25 years old. Which is still working very well, so no reason to change it.
 
JohnW2 said:
Obviously not essential (a much much simpler system would 'work'!), but for those who like the new-fangled (and have appropriately deep pockets), perhaps better than a situation in which all but one of the TRVs are (with heating 'turned on') unable to switch on the boiler if the wall thermostat is 'forbidding' that :-)
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I once designed a system, which supported a multitude of temperature sensors. The one sensing the lowest temperature, would if necessary, turn the boiler on.
 
JohnW2 said:
It is - but (speaking from relative ignorance) the impression I get is that 'the requirement' is not satisfied by TRVs alone. Hopefully someone knows something about this, and can tell us.
Click to expand...

It's a matter of layout....

If the thermostat, is placed where it tends to be cooler, in the place which tends to lose heat quickest, and where there is no TRV on the radiator, just mechanical TRV's on the other radiators. Then it will work just fine. That place, is usually, the hall.
 
ebee said:
My understanding, from a Heating Engineer is that with TRVs a Room Stat is still required and is used as a "High Limit Stat".
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That's roughly what I was trying to describe.

However, even if it's roughly correct, it sounds like a pretty useless/silly 'regulation' (if that's what it is) since, in the presence of TRVs (even totally dumb ones) on all rads, one can always turn the wall stat up to 'maximum', therefore effectively returning control entirely to the TRVs - a bit like having a reg which demands an 'openable window' but which cannot do anything to force anyone to open it :-)
 

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