Originally Posted by bansil
What I want is a 30/50 gallon water heater that uses 2 120v elements (say 2000wt) so I can have plenty of hot water when on 50 amp hook up
So only waters heaters I am finding are 3500/4500, + dual elements and 220/240v
So If I can find a water heater with 2 element holes can 1 thermastate be used to control 2 120 elements?
Remember, a 50-amp hookup does
have 240 volts present, providing 12,000 watts. The issue would be when you have a 30-amp 120-volt shoreline, with only 3600 watts provided.
What about just running the two 240-volt elements at 120 volts? Heaters are resistors, and resistors don't care about under-voltage. 4500 watt element at 240 volts draws 18.75 amps. The resistor would be 12.8 ohms. At half the voltage, that resistor would pass half the current, which would be 1/2 x 1/2 = one quarter the wattage.
A water heater that gives 4500+4500 = 9000 watts at 240 volts would give 1125 + 1125 = 2250 watts connected to 120 volts. Isn't that what you are looking for? Or did you want 2000 + 2000 = 4000 watts total?
As long as the controls are the standard mechanical thermostats and not an electronic circuit board, there should be no issue at all.