Hi Josh, welcome to the forum.
For other readers, here are the system details - a Gree Flexx 7 kW in Ottawa, Canada.
Your data collection is a little unusual, as systems usually report flow and return temps for the heat pump side of the buffer, but I can see the interest in knowing how hot the water is coming out the other side. This is probably fine from a metering perspective, but need to bear it in mind when comparing stats against other systems.
We donāt usually see heat output including electrical energy from the auxiliary components; Iām not sure how I feel about it. Your logic of āit nearly all gets converted into heatā is sound, just not common practice. Itās normal for standby and pump consumption to drag COP down. Be interesting to see what others think about that.
Looks like it took a little while to get the electrical metering sorted, so COP is a bit wild for the first day. You can crop the data by setting the āStart Dateā in the app to a timestamp, e.g. 1715313480 (5am May 10th).
I donāt know much about buffers, except that many of the top installers here aim to design system that donāt need them. In your case itās there to provide hydronic separation between the primary and heating circuits, as well as to add volume for defrosts.
Itās quite common to see heat pumps eager to get up to temperature as quickly as possible, and it can be tricky to tame them. Your 7 kW unit is often delivering 11 kW of heat, which is considerably higher than the ā3.66 kW @ -3Ā°Cā heat loss. If the controller has a āquiet modeā setting, this might help bring it down.
Can see here the heatpump putting heat into the buffer in short bursts, and the heating circuit then distributing that heat over a longer period. You wonāt see steady running in mild weather, as the heating circuit canāt remove the heat as quickly as the heatpump can put it in, so it will cycle. Larger emitters or smaller heatpump would cycle less.
