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The UKHA-ARCHIVE IS CEASING OPERATIONS 31 DEC 2024


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Re: Homevision control of Central Heating



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I think it's "more efficient" only if you are running a system where the heating is on 24/7 - like a nursing home etc.
 
If - like us - you just want a blast of heat when you come home a night it's not good.  We have radiators upstairs (thankfully) so we can heat the bedrooms at night easily.
 
Last winter I tried running the UFH constantly, like you are supposed to.  My oil bill over the winter was 40 quid a WEEK!!!!!!!!
 
Sounds like you need better temperature control - maybe some DS1820s(?) using up some of that spare CAT5 (you have got some spare haven't you?) to allow HV to provide additional control for each zone valve.  With some clever programming, I'm sure you can set a temperature of say 15C overnight, and then up it during the day and evening when you're in, and lower it slightly when you're out (Comfort).
 
The problem seems to be the 'inertia' in getting the floor mass to a working temperature, if you switch the heating off (at night for example) then the floor will cool and in the morning the UFH will have to start with a cold floor again.  If you could maintain a low floor temperature overnight, then it should be more responsive in the morning.  That's based on MY understanding, so might be complete nonsense.
 
I've just added a programmable thermostat to my system, and it's now much more flexible.
 
James H

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