I blow out the lines on my rv to winterize. I use a tankless compressor with a separate regulator and some adapters. You don’t need to bypass the heater but just drain it (I used a toilet type water valve on a flexible hose permanently attached with the valve— works on heaters with a specific drain port). Make sure you drain the outside ports also, like the shower port. Put the rv antifreeze in the sink and shower drains to protect the pipes in case there is still water in there.
Use antifreeze wherever there may be residual water….
There are loads of discussions about this here plus you tube is loaded with them.
Your hot water heater should have what looks like a large nut at the bottom, there are a couple of types of heaters, one with just a drain plug and one with an anode rod attached to the nut! If you have the one with the anode rod, you will probably need to replace it and flush the tank of the anode rod leftovers. Buy the tank flusher with the metal spigot, not the plastic or rubber.
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