This problem is a life little knowledge, but a lot of people do not know certainly. Actually, did a simple calculation to understand. Say to nod preliminary knowledge first: Substantially, the quantity of heat that increases the temperature of 1 premium need of 1 degree of place is 1 kilocalorie about, the cubage of crock of ordinary hot water about 3 litres, burn this 3 premium 100 degrees from 15 degrees, needs quantity of heat is: (100-15) X3=255 kilocalorie. Should calculate respectively only now piece waste how many heat energy burning gas and electric energy, can achieve the energy that the place that heat water uses, go further computation gives a bad news to ignite the price of gas and electric energy, knowable path heats which kinds means more be economical.
Above all, one stere lights angry calorific value, it is 8500 kilocalorie about, according to national level, the thermal efficiency that lights gas cooking stove commonly is about 50% . Also be to say namely, heat boiled water with kitchen burning gas, need expends the quantity of heat of 255x2=510 kilocalorie, be equivalent to 0.06 stere burning gas. If the price that one cubic metre burns gas is 3 yuan, the price that heats one crock water is 1 horn 8 minutes money. If ignite angry price,be 5 yuan of one cubic metre, burn one crock water to need 3 horn money.
Treat the condition of bad news report again. 1 degree of report (namely 1 kilowatt hour) the quantity of heat that can produce, it is 857 kilocalorie about. If electric heat jug (or electromagnetism furnace, the difference is not very big) efficiency is the word of 80% , need waste time can 255/80%=318 kilocalorie can heat one crock water, was equivalent to using up 0.37 degrees of report. If charge of electricity 0.5 yuan 1 degree, burn one crock water to cost 1 wine cup 8 minutes 5 li. If charge of electricity 1 yuan 1 degree, criterion charge of electricity needs 3 part 7 minutes.
On put together, actually both cost is about the same, the key should see report and the value of itself burning gas how.
