Heat pump running costs comparison question

[andygo]

Hi

This is stupid question maybe.....but grateful for any answers.

If two inverter heat pumps of different sizes have the same heat load under the same conditions - neither of them operating at max or minimum - say a 7kw and 11kw - will they use the same amount of energy? or does the smaller heat pump always use less electricity than a bigger one?

What's the formula to work out how much energy a heat pump uses?

Thanks in advance

Andy

 

[ragg987]

ASHP COP is higher of it is not running at max.

 

So if heat load is the same, then the larger heat pump will potentially require lower energy to run.

 

There may be other factors e.g.  number of fans or circulator size that impact this. If you look at COP figures within a single manufacturers range you will see the numbers are not the same.

Edited November 19, 2021 by ragg987