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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.
A pilot light in a typical gas appliance uses about 0.01 therms per hour.
A 10-kilowatt heater produces 34,120 BTUs per hour.
One MCF (thousand cubic feet) of natural gas is equivalent to approximately 10 therms.
Depends on the waatage of the immersion heater. Read the name plate details of the heater - it shows the wattage of the heater. Assuming the wattage is 1KW (1000Watt) the KHW will be 1KHW if you use the heater for 1 hour.
The heater uses 1000 watts of power at every instant it is running. If it runs for 1 hour, it uses 1000 watt-hours of energy. That is called a kilowatt-hour or a Unit. So it it uses 1 kilowatt-hour per hour.