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GrahamF
GrahamF
@grahamf
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Reputable Member
Joined: May 2, 2025
Last seen: Dec 3, 2025
Profile Activity
Topics: 6 / Replies: 93
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Reply
RE: Should Our Water Circulation Pump Be Configured to Run All The Time?

@grantmethestrength In winter, one would hope that the heat pump compressor is running continuously, so then the water pump must be running all the ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Large heat pump options for church building

This church project has more in common with a commercial building than a home. Maybe an obvious point, but it is important to consider how quickly...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Should Our Water Circulation Pump Be Configured to Run All The Time?

@jamespa I tried both settings. Pump blockade definitely controls the whether its internal water pump stops when the compressor stops. The energy...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Should Our Water Circulation Pump Be Configured to Run All The Time?

@iaack I could still use weather compensation to control the flow temperature, even with Pump Blockade = Yes, but the room thermostat in the Grant Aer...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Should Our Water Circulation Pump Be Configured to Run All The Time?

@dgclimatecontrol just to clarify, the water pump is inside the heat pump. It is controlled by the Grant Smart Controller that also contains a thermo...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Should Our Water Circulation Pump Be Configured to Run All The Time?
2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 26
Views: 1122
Reply
RE: Heat loss calculations and how they work in conjunction with heat pump sizing

Yes that is a very fair point. I was thinking of the situation where you really need a 10kW heat pump, but install a 12kW or 16kW. Other items could...

2 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Heat loss calculations and how they work in conjunction with heat pump sizing

@jamespa thanks for sharing your analysis. We have a commercial scale gas meter installed. We used to have two boilers, but then moved to a single 4...

2 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Heat Pump Installers: Competence, Illusion and the Hard Truth Homeowners Must Face

@ashp-bobba wow that is such a professional approach. I am really impressed!

2 months ago
Forum
Government Schemes, Regulations, Training, Planning & Organisations
Reply
RE: Heat loss calculations and how they work in conjunction with heat pump sizing

Yes, I agree with your points. However, the risks are different in nature. If you oversize a heat pump, then the risk is that it is less efficient. ...

2 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Heat loss calculations and how they work in conjunction with heat pump sizing

@batpred I suspect there is probably a heat pump owner maturity curve. People start by trying to get the last 5% efficiency out of the system. The...

2 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Heat loss calculations and how they work in conjunction with heat pump sizing

@jamespa I am really impressed that your heat loss estimate was so accurate. May I ask what kind of house you live in? In winter, when we had the g...

2 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
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