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The simplest is to install a coal-fired boiler, the most economical is to install a commercial air energy hot water unit, or you can use solar energy with a larger water tank.
If you insist on using a cool shower, you don't need a water heater.
1.Preparation and basin installation: Regular shower room manufacturers will send professionals to install it, and use all the tools with you, which is faster and more convenient. >>>More
You can add a special return line device or prepare a large bucket in the shower room, and put cold water in the bucket before each use of water to wash clothes or flush the toilet. >>>More
This situation should have little to do with the water heater, when there is no running water, the solar water heating is out, and the water heater cannot be used without running water. Check the tap water switch, and the mixing valve.
Electric water heaters are completely OK, but you should choose an electric water heater produced by a regular manufacturer, standardize the installation, reliable grounding, and there is no problem at all with the use. >>>More