BTU's, watts and amps for heaters

What is a BTU? The British Thermal Unit is a way to measure energy. One BTU is the amount of energy it takes to raise the temperature of one pound of water by one degree Fahrenheit.

The below measurements are approximates.

1500 watts, 12.5 amps, 5,118 BTU's

900 Watts, 7.5 amps, 3,070 BTU's

750 Watts, 6.25 amps, 2,559 BTU's

200 Watts, 1.67 amps, 682 BTU's