Post your heat pump temperature differential!

[AGP noob]

1-2 degrees

That is the difference between water temp intake and output.
Its pretty small so Im wondering if this is good or bad.
Im using the FH120 heat pump 20k BTU (small I know). Temps are highs in 70s and lows high 40s. Northern cali bay area

 

[JamesW]

It depends on the flow rate.

For a 20,000 btu/hr heater, here are the expected temperature rises based on flow.

GPM.........Degrees Fahrenheit rise from inlet to outlet.

10....................4

20...................2

30....................1.3

40...................1.0

50..................0.8

60.................0.67

 

[AGP noob]

ah got it
thank god there are smart people on here!

 

[JamesW]

How many gallons in the pool?

20,000/(gallons x 8.33) = expected pool temperature rise in pool (excluding losses).

Pool size.............Degrees per hour
2,400........................1.00
5,000........................0.48
10,000......................0.24
15,000......................0.16
20,000......................0.12

 

[AGP noob]

14x48 round so ~4k gallons
So ~ 0.57 degrees/hr

thanks!

 

[JamesW]

As the pool temperature rises, your heat loss rate will increase until it is equal to the gain rate and the temperature rise will stop and the temperature will remain steady.

Evaporation loss is the biggest source of heat loss.

Covering the pool with a solar cover reduces evaporation and helps retain a lot of heat and it will allow you to heat to a higher temperature than without a cover.