How to convert BTU per hour (BTU/hr) to watts (W).
One BTU/hr is equal to 0.29307107 watts:
1 BTU/hr = 0.29307107 W
The power in watts P(W) is equal to the power in BTUIT per hour P(BTU/hr) divided by 3.412142:
P(W) = P(BTU/hr) / 3.412142
Convert 20000 BTU/hr to watts:
P(W) = 20000 BTU/hr / 3.412142 = 5861.42W