Standard shower is taken to be 10 gallons at 8.35 pounds per gallon and 60 degrees F of heating = 5,000 BTU per shower in round numbers, assuming 100% efficiency water heating.
1kW is 3,412.13 BTU/hr
A BTU is about 1055 joules. A kilowatt is 1000 joules/second, so it is 3,600,000 joules/hour. Dividing that by 1055 joules gives you the equivalent of about 3400 BTU/hour.
Many factors figure in other than square footage. Such as the height of the ceiling and number of windows. But, for most houses, 20 to 22 btu per square foot will do. 40,000 to 45,000 btu should do.
Divide the dollars per kWh by 3,412.14163
You need to look at a steam table first then Multiply lbs/hr steam x latent heat of evaporation in BTU/lb @ the operating pressure.
1,055.05 joules per BTU.
About 115K BTU per gallon.
One KW of electricity will give you 3,412 btu of heat.
114,000 BTU/gallon
2500 btu per cubic foot of vapor.
For regular gasoline, 125,000 BTU per US gallon
One BTU per second is 1.434 hp
12,000 btu = 0ne ton
82,810 Btu/gal of Propylene
65,000 BTU per hour equates to 19.05 kW
i think it is one british thermal unit
Propane = 91,600 btu per gallon