What is the maximum temperature of a water heater

General water heater maximum temperature of 75 degrees. Which is divided into: storage type electric water heater maximum temperature: 75 degrees; instantaneous electric water heater maximum temperature: 60 degrees; burner water heater maximum temperature: 90 degrees; solar water heater maximum temperature: 100 degrees. I don't know if there is a national standard, I just know that most of the water heaters on the market are 75 for the highest limit, if 80 degrees or more easily caused by the inner liner burst porcelain, large pieces of scale, low temperature is estimated to be not enough to use. 75 degrees is an industry standard, as if the golden mean point, just fine.