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RobS
@robs
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Estimable Member
Joined: Oct 15, 2024
Last seen: Jul 26, 2025
Profile Activity
Topics: 0 / Replies: 54
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Reply
RE: Heat pump's integral circulator pump

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...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Heat pump's integral circulator pump

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...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: efficiency factor of heat pump brands

Better than nothing from losing it as waste heat though.

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: efficiency factor of heat pump brands

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...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Heat pump's integral circulator pump

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. ...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Heat pump's integral circulator pump

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...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Heat pump's integral circulator 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...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Ecodan Energy Monitoring Pack

That's really a question for the OpenEnergyMonitor folk (hello@openenergymonitor.zendesk.com) but if you just wanted to monitor the combined input/out...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Ecodan Energy Monitoring Pack

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...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@jamespa The 6kW is £4666 and 8kW £5295 on midsummer's, so no not much.

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

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...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Heat Pump + Dynamic / Smart Tariffs - what is your approach?

Presumably the timer for timed DHW, that @jaket suggested, is just the standard feature of an Ecodan controller (and other heat pump controllers), so ...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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