HOT HEATER TANK BY PASS
For those interested in having a power transfer to another load.
This is what has been done in some systems.
The water heater does need a thermostat to open the current to the water heater resistive load and upon opening of the thermostat, a relay is turned ON to connect the power to another load.
The relay needed needs to have the same voltage than the resistive loads receive.
Place the RELAY winding IN parallel with the thermostat contacts, so when it opens, the relay is turned ON connecting the secondary load.
One needs to recognize that in this case the water heater is the main load and the Relay activate load is the secondary one.
So if the voltage is AC and high voltage, the relay is AC and high voltage.
In some cases with AC capabilities a transformer has been used to bring the voltage down to a lower voltage and sometimes rectified to be used with DC relays.
If a schematic is needed, let me know.
Nando