What size Heat Pump do I need?
8th May 2009

8th May 2009

After doing quite a lot of research online I could not find a definative answer to what size heat pump for each pool.  So I thought this must scare a number of people away from actually buying one of these wonderful environmentally friendly air source heat pumps.

So here comes the math:

1) Work out your desired pool temperature. (*c) e.g.


2 ) Work out the coldest temperature on average in your pool season.(*c):


3) Then get the difference between step 1 and step 2 :

28*c – 15*c = 13*c

4) Now work out the surface area of your pool in ft2 by (length x width)

30ft x 15ft = 450ft2

5) Now:

difference in temperature (*c) x surface area of pool (ft2) x 12 = btu’s per hour needed to heat your pool.

13 x 450 x 12 = 70,200 btu

This may seem baffling but this will help you to find and specify which heat pump is needed to keep your pool up to temperature all summer long.


Deep End Pools is a trading name of CAW (Group) Limited registered in UK number 08775435. GB VAT Number 176900686