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240 volt minimum wire is orange wire normally 10-2 with a ground, depending on the amps the devise you are wiring to. Not 12.

240 volt is two 120volt wires normally installed to a 30 amp double...

To operate 120 volts A/C you need the proper wire size and Amp load. This requires one 120 lead normally black wire, one neutral wire normally white, and a ground normally bare. I would strongly...

Want to wire my 30 amp 240v double element hotwater heater to operate on 120volts and be able to switch back to 240volts when more hot water is needed quicker. I have solar panels and want to slow...

You need to go to your local building code people by online or in person. They will give you the code specifications needed for your locality. You do normally require rebar in the footings concret

May not use 3800watt elements, just used for the question.
The 4500 watt elements looks like will be about right. I will go to a chart for raising 1 pound of water 1 degree F. To calculate the...

You need to use proper wire size for your code most likley #4 or # 2 copper. You need to tie in just below your 200Amp Main breaker. This may require additional screws or other hardware for proper...

Check the Cal power box in your spa it should have a reset button on the box. Push the button and reset

Thanks and are you sure this correct? Do you have a basis for this? I just want to be sure before I go to the added cost of buying the new elements

I would be able to heat the water slow over a @ 7 hour period when my solar panels are at max output thus saving me about 80% on the cost of heating water

Thanks but you did not answer my queston on the watts issue?

If I change the voltage on my 3800 watt water heater element from 220 volts to 120 volts wiill it now heat at 1/2 the watts or 1900 watts? I have solar panels and want to slow heat the water during...