First you need to find out how many amps the heater draws.
Then use this formula:
Volts (220) X Amps = Watts
Then take:
Watts x 3.41214 = Btu/hr
how many square feet does a 14,000 btu heater heat
btu = 7500 watts * 3.14 btu / watt = 23,550 btus / hr
my aircondition is 13000 btu on 220 volt ac is how many watts
Burning Stove - 110,000 BTU How many square feet?
36000
300
10.000
For a 1000 BTU heater, the power consumption would be approximately 293 watts. This is because 1 watt is equivalent to 3.41 BTUs.
40956
A 18,000 BTU heater uses approximately 0.157 therms per hour. This can vary slightly depending on the efficiency of the heater and the specific model.
If you're in Celsius, 13459.5 Btu's. If you're in Fahrenheit, 12632.5 Btu's.
A 200,000 BTU wood burning stove will heat 1,000 square feet.