If it's a 20 gallon, it is 120 volts and has just 1 element.
My dad just got rid of one in early Dec.
It had a lot of sediment in the bottom.
After I changed it out and took it outside, it was 1/2 full
of some clear silicone looking gunk.
It may be the same with yours. If it is old and you are on
a water well, there is no telling what it is full of.
You may just be heating 5 or 10 gallons of water instead
of 20.
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