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Rob of York
@rob-of-york
Member
Estimable Member
Joined: Aug 25, 2026
Last seen: Oct 4, 2026
Profile Activity
Topics: 7 / Replies: 91
AllTopicsReplies
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RE: Next steps on my ASHP journey: Radiators and Pipework

Just read this excellent RHH article that suggests a good solution Heat pumps that support a variable or adjustable delta T (dT), for example 7 ...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Next steps on my ASHP journey: Radiators and Pipework

I’ve thought about the pipework and flow rate issues from first principles and tried to work out what will happen as follows: Basics 1 Kg of wate...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Next steps on my ASHP journey: Radiators and Pipework

Post by: @old_scientist The first thing I would say is don't get too hung up on matching radiator output exactly to the room heat loss - heat will ...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Next steps on my ASHP journey: Radiators and Pipework
1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 61
Views: 1653
Reply
RE: How Accurate Is My DIY Heat Loss Calculation?

@kilgorexv There is a simple rule of thumb by Michael De Podesta that is: Heat loss = Annual gas usage x Design temperature difference / 57.3 Fo...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Adventures in heat loss calculations

I agree that the close alignment of the theoretical and practical heat loss calculations that I did for my house may be rather fortuitous. However,...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Adventures in heat loss calculations

Thank you all for the positive comments. I have made a simple spreadsheet that implements the practical heat loss calculation that I hope will be of...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is the "divide by 2900" rule still valid?

There is another estimator that you could use, a formula from Michael De Podesta's , which is simply annual gas usage divided by 57.3 multiplied by th...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How Accurate Is My DIY Heat Loss Calculation?

@kilgorexv I think you are missing something in your heat loss calculations - the effect of thermal bridging. Thermal bridging is when you have joins ...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Adventures in heat loss calculations
1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 40
Views: 1078
Reply
RE: What Air-to-Air (Air conditioning) system do you have and how efficient is it on heating and cooling

@Mars Good questions! The downstairs unit did the majority of the heating in winter, as this was overnight taking advantage of cheap rate electricit...

1 month ago
Forum
Air-to-Air Heat Pumps & Air Conditioning
Reply
RE: Do I add Air Con or MVHR to existing A2W ASHP?

@toodles I would recommend an A2A system. We have Daikin Comfora units (2.5 kW and 3.5 kW). On the hottest day of 2026 the system dumped 36.5 kWh of...

1 month ago
Forum
Air-to-Air Heat Pumps & Air Conditioning
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