One side-note as I put my 2014 24R water heater on bypass...
The previous owner said the power inventer was bad from the factory, so the dealer replaced it. I looked under the sink, under bed, etc. and could not find it. When I removed the water heater panel, there it was. BUT, the J..kA.. that replaced it just let it lay on all the existing wires in the area instead of screw it back to the wall -- mostly wiring from the control panel above the Fridge ! In addition, there is a furnace duct hose going to the rear bedroom, and the corner/weight of the inverter tore the hose open.
All very easily fixed, but all due to a piss poor Dealer repair. They installed a PD9160A. I have to check to see if that is one that has 4-stage battery charging circuitry.