Just an FYI for those of you with a propane only water heater.
You might be interested in a Camco 11673 Hot Water Hybrid Heat Kit.
https://www.amazon.com/Camco-11673-...=1466642553&sr=8-1&keywords=camco+hybrid+heat
I just installed this in a propane only 4-gallon suburban water heater on a truck bed camper.
It's relatively easy and works like a charm.
It does require removing the anode rod and replacing it with a fitting with the heating element running through it, secured by a brass compression fitting. Only 400-watts so it won't draw too much power with an adjustable thermostat.
I'm pleased with the results and can save my propane for cooking.
You might be interested in a Camco 11673 Hot Water Hybrid Heat Kit.
https://www.amazon.com/Camco-11673-...=1466642553&sr=8-1&keywords=camco+hybrid+heat
I just installed this in a propane only 4-gallon suburban water heater on a truck bed camper.
It's relatively easy and works like a charm.
It does require removing the anode rod and replacing it with a fitting with the heating element running through it, secured by a brass compression fitting. Only 400-watts so it won't draw too much power with an adjustable thermostat.
I'm pleased with the results and can save my propane for cooking.