The amount of gas used by ordinary families in a month is not certain, but it varies according to the population, cooking and bathing frequency. A family of three, frying and frying every day, every day, without using a gas water heater to take a bath, uses 0.7 cubic meters of gas a day, which is 7 cubic meters of gas in ten days. Use 21 cubic meters of gas a month. If you take a bath with a gas water heater, three people need 1.2 cubic meters of gas a day, 12 cubic meters of gas for ten days and 36 cubic meters of gas a month.