Originally Posted by Aguyfromcalg
Hi and welcome.
Glad your shake down cruise went so well.
Your hot water tank is probably still set on bypass. Locate your hot water tank and remove the access panel. You should see the lines and valves. Reverse the valves. ( off to on and on to off). You should hear water being pumped into the hot water tank. Make sure the drain plug is in and open the taps to let the air out while the tank is filling. Do a search on here about how to sterilize the water tank. Your low point drains should be by your water tank.
Best of luck on your travels and when you have time post pics of your RV.
Check that water heater throughly. If you had it turned on while it was empty you might have damaged the heating element. Follow directions above and then when you get water out of the warm water side, turn on the heater and test to be sure it is working, (providing warm water).
As for the fresh water tank, you should have low point valves, usually three, open them and let the antifreeze drain. It' is likley only a quart or two. The three low point drains are the tank, hot water line low point side, and cold water line low point. You drain the water heater by opening the door on the side of the rig and removing the plastic plug near the bottom of the unit.