Hello,

I have an electric pool pump and am trying to figure out how many

BTU's are given off during normal operation (let's say 1 hour). The

specs are as follows:

1hp

RPM 3450

230v @ 7.5 amps

0.75kw/hr

I was told that there should be some formula to find this out; however

I cannot seem to find it. Any help would be great.

Thanks,

Doug

Answering this question per the above info.

1) 230 x 7.5 = 1725 watts.

2) But one horespower is 746 watts.

3) So item one maybe the starting current?

Using that it IS a 'one' horsepower motor which at 230 volts will have

a 'running' current of 746/230 = 3.2 amps.

4) If the motor has typical efficiency of 75%; 25% of the (one

horsepower) wattage is dissipated as electrical heat.

5) 746 x 0.25 = 186.5 watts.

6) 1000 watts = 3413 BTU (British Thermal Units).

7) Therefore 186.5/1000 x 3413 = 636.5 BTU, dissipated as electrical

heat by the motor itself.