Proper Winterization & Storage Tips

Proper Winterization & Storage Tips

Depending on your location it may be necessary to properly winterize your unit to ensure that freezing conditions do not damage any part of the on board water systems.

First let's discuss what components are susceptible to freeze damage which would result in water leaks and potential costly service repairs.

  1. Brass Check Valves – These valves are in-line valves that keep water from spilling back out of the water fill ports. These valves will be located on the Fresh Water Line, City Connection Line and the Black Tank Flush Line.
  2. Plastic Check Valve – The Dometic Standard toilet has a plastic check valve located at the rear of the toilet.
  3. Water Valves – These valves are used to control the flow of water. You may have 2 or 4 valves located next to the water pump, 1 located on the lower shell floor to drain the fresh tank, and 1 located on the black tank flush port line.
  4. P-Traps – These are used in the sink and shower drain plumbing lines. It retains water and traps debris that has drained from the sink and prevents it from forming a clog deep within the plumbing system, and stops sewer gases from passing into the camper.
  5. Water Pump & Filter – The water pump filter is used to trap debris and keep it from entering the pump and water line system that is delivered to the faucets.
  6. PEX Push Fittings – These fittings are used to connect different runs of pex pipe through out the camper. Pex itself is freeze tolerant but these plastic and/or brass fittings are not.
  7. Faucets – The kitchen, bathroom and external shower faucets all maintain water at the faucet when in use and thus present a potential freeze issue if not properly winterized.
  8. Water Heaters – All water heaters should be fully drained of all water and the bypass valve must be set to winterization/bypass mode. This allows for RV antifreeze to be utilized in the plumbing system without filling the water heater itself.

*Proper winterization method to ensure that all components are protected.

  1. Drain all water from the system (All tanks, water heaters)
  2. Set bypass valve at water heater for winterization mode.
  3. Change valve configuration at water pump for winterization mode.
  4. Use water pump to draw RV Antifreeze (potable Safe) into the camper.
  5. Turn on the kitchen faucet (Cold Line) and run until antifreeze comes out.
  6. Change to the Hot line and run until antifreeze comes out.
  7. Perform steps 5-6 for the bath faucet.
  8. Ensure plenty of antifreeze drains into the P-Traps for the kitchen, bath and shower drains.
  9. Flush the toilet until antifreeze starts to fill the bowl. Leave antifreeze in bowl to lubricate seal.
  10. Turn off water pump.
  11. Connect hand pump with antifreeze to the fresh tank fill connection. Pump at least 3- 4 times. Antifreeze is potable safe and will not hurt if it goes into the fresh tank.
  12. Connect hand pump with antifreeze to city connection line, turn external shower cold line on and pump until antifreeze comes through shower faucet. *TIP: It will be hard to pump in the city line if the faucets are closed.
  13. Turn cold line off and hot line on, pump until antifreeze comes through shower faucet.
  14. Connect hand pump and antifreeze to black tank flush port. (You may have to go inside and turn the in-line valve open to allow the antifreeze to freely pump into the tank. *One pump should be sufficient as we are only protecting the check valve. For 2018 Models and newer you will need 4 pumps to sufficiently protect the new flush port system. This change was put in place to meet new codes for the black tank system ensuring that no backflow of waste water can get inside the water supply line. If you are not certain if your camper is equipped with this new port then pump 4 times to be on the safe side.)
Please see article  Truma Winterization Process on how to properly winterize your Truma Water Heater.



  • The camper can be used in cold weather applications as long as the furnace is utilized to keep the components warm and above freezing temperatures.
  • If traveling between camp sites during cold weather season it may be necessary to winterize depending on outside temperatures.
  • If water is left in the water heater during freezing temperatures even for short periods of time, it can cause damage.
  • RV Antifreeze is designed to replace water and should NEVER be mixed with water as diluting it will defeat its purpose.