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JamesPa
JamesPa
@jamespa
Moderator
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Joined: Apr 3, 2023
Last seen: Aug 22, 2026
Topics: 27 / Replies: 5275
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

To some extent you are doing that by contributing to this forum. I have also wondered the same (but am enjoying being retired too much to want to com...

3 years ago
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

reposted because it got out of sequence somehow As stated upthread about 2-3% per deg C, but if you want an accurate number check your system...

3 years ago
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

As stated upthread about 2-3% per deg C, but if you want an accurate number check your systems data tables. Throttling is a different phenomenon whi...

3 years ago
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

Agree. Doubly so with retrofits, where system design in the context of the specific house is the key to an implementation which is effective, cost ef...

3 years ago
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

Spot on IMHO and my studying, like yours, of manuals, posts and the various other info available.

3 years ago
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

Thats from Freedom, what does the OEM actually say Here is the system diagram from page 4 of the Midea manual. No buffer tank, LLH or PHE in sight.

3 years ago
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

In fairness to the manufacturers I think that most of the critical tests are done to BS/EU standards, and they generally quote the numbers. The stand...

3 years ago
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

And as i point out above, its easy to work out roughly how much its costing. Measure the flow to flow temperature drop across the llh and reckon on 2...

3 years ago
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

It's a fair question There are two approaches to answering it I can think of. 1. Measure the flow-flow temperature drop across the llh. For each...

3 years ago
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RE: Secondary pump speed - how much slower should it be?

Going back one step, what's the llh there for? Buffers of a sufficient size correctly plumbed can be made to work (as in not materially compromise p...

3 years ago
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

Well said! I (and I suspect many others) have met a fair few installers who don't seem to accept this!

3 years ago
Reply
RE: Ecodan ASHP - How to optimise my set up?

Given that my advice is be patient. If you haven't already, get your system set up so that it should work well as the designers intended it to. That ...

3 years ago
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