The two sets of units are not compatible. While a gallon may be converted to a litre, there is no relationship between kWh and hour.
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KWH
1 gallon of water weighs 8.34 pounds. It takes I BTU to change the temp of 1 pound of water 1 degree F. So for 1 gallon it takes 8.34 BTU. It takes 3412.14 BTU to equal 1 KWH. So 8.34 Btu x (1KWH / 3412.14 BTU) = 0.002444 KWH
A 60W bulb will use 60W X 1 hour / 1000. this will give you the KWh - the units your electricity company uses to charge you.So 60 X 1 =6060/1000 =0.060 Kwh
The number of kilowatts used by a device in one hour. This gives you the rate at which energy is consumed.
There is no simple conversion because there are different gases used for heating and each has its own conversion rate.