ASHP for heating setup

[joth]

2 hours ago, PhilT said:

Mine cycles between the set temp and one degree above which is fine for me. The manufacturer has confirmed that's the way it's designed to operate otherwise it would keep switching on and off around the set temp. I have radiators

Yes there will always be some amount of hysteresis. You can also set the target temp a bit lower to allow for this 🙂

[ReedRichards]

7 hours ago, joth said:

Yes there will always be some amount of hysteresis. 

Unless you have the option of Load Compensation.  That can maintain a very stable room temperature.   

[PhilT]

2 hours ago, ReedRichards said:

Unless you have the option of Load Compensation.  That can maintain a very stable room temperature.   

Mine does that quite well on "Auto" mode (a combination of WC and LC) if it is cold enough outside for modulation not to fall below minimum continuous power delivery. But if outside temp is mild it will not allow the flow temp to fall below a level corresponding to minimum continuous power delivery to prevent the compressor switching on and off, so it overshoots target temp by one degree then switches off until room temp cools to target temp again, for the reason previously mentioned.