Properly winterizing your Haven 220 protects your plumbing system from freezing temperatures and prevents costly damage during storage. The process is straightforward: drain all water from the system and replace it with RV antifreeze. 


Follow the step-by-step guide below to prepare your unit for winter storage. 


Haven 220 Winterization Guide


Start by removing all water from your Haven 220. 

  1. Drain the fresh water tank. 
  2. Open and drain the gray tank.
  3. If anything is in the black tank, dump and rinse it before winterizing. 
  4. Open the hot and cold low-point drains and allow the plumbing lines to fully drain. 
  5. Once everything has completely drained, close all valves and drains before moving on. 


Step 2: Drain the Alde Hot Water Tank 


Your Haven 220 is equipped with the Alde Heating and Hot Water System, which includes a hot water tank that must be drained separately. 

  1. Inside the unit, remove the dinette cushions. 
  2. Unscrew and remove the access panel beneath the bench seating. 
  3. Locate the Alde relief valves. 
  4. Open the relief valves and allow the tank to fully drain. 
  5. Once draining is complete, close the valve securely. 

Step 3 (Recommended): Blow Out the Water Lines 


While not required, blowing out the lines provides extra protection by removing trapped water. 


  1. Connect an air compressor to the city water inlet. 
  2. Set pressure to no more than 40 PSI. 
  3. Open one faucet or fixture at a time. 
  4. Allow air to push out any remaining water. If water is still present, you will see it spray out as air moves through the system. 


Step 4: Add Antifreeze Using the Nautilus System


Now it’s time to protect the plumbing with RV antifreeze. 

  1. Connect a short hose to the Nautilus system. 
  2. Set the Nautilus to Winterize Mode. 
  3. Ensure all faucets, drains, and fixtures are closed (this allows the pump to create suction). 
  4. Place the other end of the hose into a jug of RV antifreeze. 
  5. Turn on the water pump. 


If the pump does not pull antifreeze: 

  • Double-check that all faucets and drains are closed. 
  • Try flipping the sediment filter to help keep the check valve open. 


Step 5: Run Antifreeze Through All Fixtures 


One at a time, run antifreeze through every water outlet until you see pink fluid. 


Be sure to include both the hot and cold lines for the: 

  • Kitchen faucet 
  • Bathroom sink 
  • Shower 
  • Exterior shower 


Step 6: Protect Drains and Toilet


Flush the toilet until you see antifreeze in the bowl. This ensures protection in P-traps and the toilet system. 


Once complete, your Haven 220 is fully winterized and ready for storage until your next adventure. Need Assistance? If you have additional questions: 


Customer Experience Team: help@nucamprv.com 

Technical Support Team: tech@nucamprv.com