It is possible to convert some flipflop electric water heaters to operate the two elements simultaneously but as AOS points out you can't do that if the total amperage draw exceeds the circuit and equipment rating (say 40A).Watch out: setting any water heater to deliver temperatures above ...
After the installation of all water lines, open the main water supply valve and fill the heater. Open several hot water faucets to allow air to escape from the system while the heater if filling. When water passes through the faucets, close them and check for possible leaks in the system....
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