Gas water heater 5 liters, 7 liters, 8 different models of promotion, is within 1 minute when the water temperature 25 ℃ hot water production, if the water temperature is 25 degress, the yield of 50 per minute degress hot water 5 liters, 7 liters or 8 liters.
     Electric water heater is 30 liters, 60 liters, 90 liters, etc., which refers to the water heater capacity of water, the equivalent of our electric stove add a kettle, the kettle of water is 30 liters Sheng, 60 l 90 liters. Take an 8-liter 40 liters of gas water heater with an electric water heater compared to 8 liters of gas water heater can be produced continuously 8 liters of water per minute, while electric water heaters need to heat a can of water for half an hour intervals. If the tank water runs out, we have to wait half an hour.
     Solar water heater in accordance with the annual average temperature of 15.7 degress, annual sunshine time is 2014 hours, the total annual global solar radiation is 111.59 kcal / square meter, if the collector area of 2 square meters, the absorption of solar radiation energy is 9.37 × 106 KJ, 35 degress according to the calculation of water temperature (based on water temperature 10 degress), a full year to provide domestic hot water (45 degress) 53.5 tons per person per bath with hot water about 50 kg, the full year Wash 1070 times, 2.93 times the average daily washing.