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Last seen: Sep 23, 2026
Unfortunately you are wrong assuming the objective is to heat the house to a given temperature. If the heating is on/off, whether controlled by the h...
Yes but at the expense of running at a higher flow temperature (and thus lower efficiency) than is necessary to achieve the power output required from...
Equally some achieve greater output than their name plate rating. Choice of model should be based on the capacity table and design min OAT, not an ar...
Good point! [/quote] True, but surely its alright to go without, or just use the immersion, on the handful of days during the year when the OAT is...
Looks like these guys are onto it, albeit for energy efficiency not system sizing.
If you have a smart meter and gas heating, you have in principle very accurate data on demand. It's not entirely easy to interpret, and some addition...
Thermodynamically it must be less efficient to cycle than not to cycle, because a higher flow temp is required to achieve the same output from the emi...
Generally I agree wholeheartedly with your sentiment. However excessive oversizing can lead to other problems. One of the MCS contractors who did a...
Imho the biggest problem is to determine 'right size'. The spreadsheet models, even if used correctly, make several more or less unverifiable assumpt...
I just re-read your post and noticed this which I missed first time round. The answer is a definite 'no'. The approach to 'name plate ratings' varie...
@derek-m Thanks, I look forward to 'playing'.
@bontwoody @squiff Also you must check the manufacturers capacity tables at the design OAT and FT. Some manufacturers 'name' their heat pumps very ...
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Degrees of Separation
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