What if the OP doesn't have a Vaillant, nor the inclination to decipher some of the worst product literature in the industry. 
Room Thermostat
- Thread starter Juddie
- Start date
What if the OP doesn't have a Vaillant, nor the inclination to decipher some of the worst product literature in the industry.
Not sure the OP even wanted weather compensation. The conversation had wandered since then, I grant you, and I was replying to the most recent post. I was simply pointing out that if you are 90% there with your setp (note the IF), then you may as well go the whole hog. I do agree with your point about the product literature, but then I have never used any heating contols that "just work", and are sophisticated in functionality. I can see why Nest was created, and it's a wonder they've not sold more. Having said that, once mine was set up there was no need the make changes.
Nest is as about as sophisticated as a light switch.
It just looks pretty. So Crapple owners flock to it like flies to shit.
It just looks pretty. So Crapple owners flock to it like flies to shit.
It is a switch, like most heating controllers installed domestically in this country. It's more sophisticated than most of them as well - given it uses learning algorithms, but still all it can do is turn the heating on and off. But given the central room thermostat with timer setup that most houses have here, it's about as good as it will get. All very 1960s. Honeywell Evohome is clearly the next level up, and perfect for granular control of rooms but I just don't see it paying back for most people. Last time I looked it would cost around £600 to do my house. The jokers. My boiler and weather comp controller were cheaper than that! Mind you, people seem to be happy to pay £200 for that rip-off BG Hive product, also just a switch, so maybe they'll be sucked in by EvoHome.
The building regs require a boiler interlock that shuts the system down completely when it's not required, for energy saving purposes.
For your system to detect that there isn't any heat loss, there must be heat put into the boiler and pipe system for it to detect. That is wasted heat, if it's not needed.
With a thermostat, the system shuts down completely when not required, so that no energy is consumed.
Room thermostats work brilliantly when they are located properly ie in the last place that warms up, and a place not subject to other sources of heat, so that all of the other rooms with TRV's are already up to temp first. They also prevent the heating starting up at all if it's not required.
Digital thermostats are also very accurate, when mine clicks, I can't tell by the temperature of the room if it's turning the heating on or off.
My experience of weather compensation, which I have to admit was some time ago, is that it can work well, but generally only for buildings that are heated continually. For example if you only have the heating on for short periods of time, the house can still be cold, even though it might be fairly mild outside, so you would want it heating up quickly, but the weather compensation because it's mild outside will hold it back. It also doesn't take into account very cold days with bright sun that can warm the house through the windows.
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