Last seen: Oct 13, 2025
@heatgeek Sorry if I miss attributed that. Yes, the same CH flow rate is maintained at all OATs. Here's the same heat pump running at lower OATs: ...
The statement was "not a single one of the top performing heat pumps on heatpumpmonitor.org have a constant dT of 8C. At warmer OATs they mostly run w...
I suspect you know it's not, but to reinforce that, not a single one of the top performing heat pumps (of the couple of hundred with certified heat an...
Better than nothing from losing it as waste heat though.
Rotary compressors usually have the electric motor in the refrigerant, as the refrigerant is used to cool the motor. Therefore the waste heat is recla...
I'm not and as I wrote the logic of Part L is a bit questionable in places. The regulations just say they must be fitted, not that they must be used. ...
The logic of Part L is a bit questionable in places! But why do you think most heat pumps can't handle this? Or more to the point, why most water pump...
Part L just requires thermostatic controls to "adapt" the heating output, so thermostatic on/off controls are sufficient. No need for variable flows o...
That's really a question for the OpenEnergyMonitor folk (hello@openenergymonitor.zendesk.com) but if you just wanted to monitor the combined input/out...
Mitsubishi's use a Sika flow meter and two thermistors (attached to the outside of the flow and return pipes) in the "plant room". From those the flow...
@jamespa The 6kW is £4666 and 8kW £5295 on midsummer's, so no not much.
There is, the Mitsubishi R290 8kW has a 6kW inverter and a 2kW fixed in the outside unit. The 2kW is only used when more output than the 6kW can produ...
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