Water heaters from Grainger include natural gas, liquid propane and electric models with standard and high-capacity tanks. An electric water heater is equipped with screw-type immersion elements and an over-temperature protector with automatic shutoff. Upgrading to a tankless water heater can lead to savings because it is not constantly heating and reheating water. You'll also find the water heater parts you need to maintain tank and tankless systems.
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To figure out what you really need, measure the temperature of your ground water, and then measure the flow rate of your shower head. Tankless heaters are rated based on degree rise at a specific rise. So, if you have 50 degree ground water, and your shower head flows 2.5 gallons per minute, you would need a heater capable of giving you a 60 degree rise at 2.5 gpm. Electric tankless heaters are going to draw 200+ amps at that rating.
an electric Point of use would be ok of your water is around 50 Deg. You would need a 30 Amp 120 V circuit that part number would be a 6DXT2.. Otherwise a small Propane units made by Bosch is a 1LXD2, this unit will require venting and is 26" tall x 16" Wide and 8 1/2" deep. This unit would be more than enough for your needs.
Be sure to use applicble codes for installation.
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