Cold end of curve 49c -3c, warm end of curve 36c 10c, bring the curve up and down set to 48c -2c. We have radiators and a1 rated house. Would this be the best way to set and save money and would I have to leave it like this all the time? Do I use the wireless stat in the rooms still?
Cold end of curve 49c -3c, warm end of curve 36c 10c, bring the curve up and down set to 48c -2c. We have radiators and a1 rated house. Would this be the best way to set and save money and would I have to leave it like this all the time? Do I use the wireless stat in the rooms still?
Hi Andy and welcome to the forum. It's hard to say whether that curve is right without knowing more about your system and house. Have you had a proper heat loss survey done and have your ASHP and radiators been sized accordingly? Is your wireless thermostat a Mitsubishi one or another brand. How have you run the ASHP so far and what have been the results?
You'll get the best efficiency by having the flow as low as you can get away with and keeping the house temperature reasonably constant. But if you're out a lot or don't mind being cooler at night then this might not be the cheapest.
Having said all that, your curve looks a bit hot for a modern well insulated house and a well designed system. Mine is 43 -3 and 25 15. If you want to test yours, turn your thermostats up full and see what happens. Depending on whether the house is too hot or too cold, you can adjust by trial and error in different weather conditions.
Ours is set to 35c at -5 and 20c at 20 and with heating on 24/7 is managing to keep the house perfectly warm even in recent cold snaps, down to -5. In the shoulder months we don’t have on 24/7. As Kev M says depends on your house. Mine is new build, 5 bed with ufh both floors. The only thing I don’t like is the DHW which we don’t keep reheating all day due to the cost.
@kev-m ours is a brand new house built 5 years with Mitsubishi wireless thermostat. I am clueless about this and trying to learn from different forums. I use to just use the thermostat on wall and crank it up when cold but sometimes that took ages to heat house up.
@kev-m ours is a brand new house built 5 years with Mitsubishi wireless thermostat. I am clueless about this and trying to learn from different forums. I use to just use the thermostat on wall and crank it up when cold but sometimes that took ages to heat house up.
Well in a newish house I'd try something like 45 -5 and 20 15 to start with. To test whether that's right, turn the thermostat to 2 or 3 degrees more than you want, set it on WC mode and see if your house is too hot or cold. You then need to tinker with the curve in different weather conditions to get it right. You can use the thermostat to set back the temperature at night or if you're out all day, but only by 2 or 3 degrees. One point is that if you're in WC mode, the house will take longer to warm up.
Give it a try and let us know what happens.
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