LANBON L8-HB 4400W/20A Water Heater Smart Switch, Preset any/30/60 Mins Boiler Timer, WiFi Electric Smart Controller Also for Grow Light, Fan, Pool Pump Timer Control, Needs Neutral Wire

This is actually a pretty nifty switch if all you want is manual control. My water heater is in a closet that is in another closet under my staircase. So, the switch is very cumbersome to get to. You can manually control the water heater from the LCD screen or through Smart Living app. It has On/OFF and preconfigured times of 30 and 60 minutes. You can also set your own preconfigured time, i.e. 120 minutes. My biggest gripe is I can't figure out how to set the timer so it will come on at a specified time and go off at a specified time. I have gone back and forth with support in China (I think), but they're not telling how to set the configuration I need.