How to dewinterize your RV water system


How you dewinterize the fresh water plumbing system depends on which winterizing method you performed in the fall. If you chose the dry method, as a starting point simply add enough fresh water to the fresh water tank so that it is about half full. If you chose the wet method, you’ll first have to drain the RV antifreeze from the system.  Keep in mind, RV antifreeze can be salvaged and reused the next time you winterize the RV, so you may opt to capture the antifreeze as you drain the hot/cold low-point drains.


To start, fill the fresh water tank about half full.  Switch the water heater from the bypass mode; seal and tighten the water heater drain plug (Atwood) or anode rod (Suburban); and reinstall any water purification equipment that should have been removed last fall.


Now, turn on the water pump and begin flushing out the lines. Open each faucet, hot and cold, to eliminate any residual RV antifreeze that may remain in branch sections of the tubing. At the water heater, open the pressure and temperature (P&T) relief valve to aid in filling. Once water begins gushing from the relief valve, close the lever. When water is flowing smoothly from every faucet, close them all. It may take a few minutes of pumping the water to rid the entire piping system of the antifreeze and to fill the water heater.


Once the water is flowing freely to every component, turn off the water pump. Open the water heater’s P&T relief valve one last time and leave it open until water stops dripping from its outlet, then close it. This allows for the necessary expansion space on top of the water inside the tank.


One other thing that you might want to check would be to attach the fresh water hose to the city connection and verify everything still operates normally via this water source. Take a quick look around to make sure that there isn’t any water is dripping or seeping anywhere.


Once you feel satisfied that the fresh water system is up and running as it should, top off the fresh water tank and you are ready to start camping!! 


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