Thanks, everyone, for the great insights and advice. I'm including the checklist I plan on using the next day or two. If you see anything that makes you
please speak up!
1 gallon of RV non-toxic antifreeze.
Magnesium anode (Suburban part # 232767?) if needed for replacement
Gather items needed:
Blow out plug
1-1/16” deep socket wrench with extension
PTFE pipe thread tape
3/4" drain plug
Compressor and airhose (make sure tank is dry)
Disconnect the city water hose.
Drain the fresh water tank.
Clean and empty the waste water holding tanks.
Turn off the water heater gas switch. Add a piece of gaffer tape over the water heater gas switch.
Turn off the water heater breaker in the power center. Add a piece of gaffer tape over the water heater breaker.
Make sure the water heater bypass valves are in the 'BYPASS' position. The valves are located near the water heater incoming lines at the rear of the water heater. (See diagram)
Open the pressure relief valve to relieve any pressure. (Move to the side while doing so)
Drain the water heater by removing the anode with a 1-1/16” deep socket wrench with extension.
Flush out sediment build-up in water heater if necessary.
Clean the water heater's anode opening threads.
If replacing the anode, apply 1-1/2 wraps of PTFE tape counterclockwise only on the threads closest to the outside of the tank. Torque to 7-8 foot pounds.
If reinstalling the anode, clean the existing threads and apply 1-1/2 wraps of PTFE tape counterclockwise only on the threads closest to the outside of the tank. Torque to 7-8 foot pounds.
If installing a temporary drain plug, screw in by hand finger tight.
Drain the shower hose sprayer.
Open the kitchen faucets, the bathroom faucets, the outside shower with hose connected, and hold the foot flush toilet valve open.
Turn on the water pump for at least 30 seconds to clear any remaining water from the lines.
Close the kitchen faucets, the bathroom faucets, and the outside shower.
Remove the strainer from the water pump, on the inlet side, to drain any water in the pump. Then replace the strainer.
Install the blow out plug in the city water inlet.
Set the compressor pressure to 40 psi, and connect an air hose to the blow out plug.
Blow out the water lines by opening and closing each hot and cold faucet, one at a time, until no water can be seen coming out of the fixture, in this order:
Toilet foot flush valve
Wait several hours to allow any water to settle and repeat blowing out the water lines.
Use 1/2 gallon of RV antifreeze to pour down sink and shower drains to fill p-traps and 1/2 gallon to pour in the toilet bowl.