The Ruipai water heater is very easy to use. It is the best water heater I have ever used. You can adjust the temperature however you want. I have been using this Ruipai water heater for 4 years and I have never had any problems! So for those who want to buy instant heating, I recommend buying a Ruipai water heater! This is the Ruipai water heater I installed at home. Let me show you the last picture