The rules for both methods were that we would start with
water from the cold tap,
and the goal was to end up with a pan full of boiling water.
I started with the gas method.
I measured the energy consumption of the gas method
pouring one litre of water in the pan,
the meter, then setting the gas going.
I put a lid on the saucepan.
The first four digits on the meter give the gas used in hundreds of
the next two (red) digits give cubic feet, and the dial reads the
fraction of a cubic foot.
The initial reading was 515316.18 cubic feet.
The heat of the flame was amazing, but the kettle-advocates clearly
had a point, when they say that the gas method is inefficient:
hot exhaust gases surged up the side of the pan.
After about 5 minutes, the water was boiling.
I read the gas meter again. The new reading was
515317.10 cubic feet.
Now, each cubic foot has a chemical energy of 0.3232 kWh.
So, subtracting and multiplying appropriately,
the energy used by the gas method turned out to be
Continue reading part 2 of How much is inside hot water...