Is there any kind of water heater that can be turned on at any time, directly hot water? It seems that many friends have faked it in the past two years. Is Ruimei water heater ok? Do you know that?/You know what? The water heater that my family bought the year before last is Ruimei. When the shower is turned on, it is directly hot water, which is different from the previous water heaters. Take a bath with this water heater in winter, take off your clothes, turn on the shower and rush in to wash. Instead of waiting for half a day as before, you should constantly test whether the water is warm by hand. I was not used to it at first, haha. It feels a bit like an advertisement, but this is really my experience after using it.