Haven 220 Winterization Guide




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


How to Dewinterize Your Haven 220




Dewinterizing your Haven 220 is an essential step in preparing your RV for camping season. This process removes RV antifreeze from the plumbing system and sanitizes your freshwater system to ensure safe, clean water for your travels. 


Follow the steps below to properly dewinterize your unit. 


Overview of the Process Dewinterizing includes three main stages: 

  1. Drain all remaining RV antifreeze 
  2. Sanitize the system using a bleach solution 
  3. Flush thoroughly with fresh water 


Step 1: Drain the System 


Begin by removing any remaining RV antifreeze from the plumbing system. 


  1. Open the gray tank valve and allow it to fully drain. Close the valve once empty. 
  2. Open the hot and cold low-point drains to empty the water lines. 
  3. Open the freshwater tank drain and allow it to completely drain. 
  4. Ensure all water and antifreeze have drained before moving to the next step. 


Step 2: Sanitize the Fresh Water System 


Sanitizing your system eliminates bacteria and ensures safe water use. 


  1. Prepare the Nautilus Panel by attaching a short hose and setting it to sanitize mode.
  2. Mix the sanitizing solution.
    • Prepare a bleach solution at your preferred strength. 
    • A commonly recommended ratio from RV industry experts such as Go RVing is: ¼ cup of household bleach per 15 gallons of water 
    • At this ratio, allow the solution to sit in the system for 12 hours for effective sanitization. 
    • A stronger solution may be flushed through immediately, but proper dilution and contact time are recommended for best results
  3. Siphon the Solution into the System 
    • Place the free end of your hose into the sanitizing solution. 
    • Turn on the water pump to siphon the solution into the system. 
    • Tip: Place all bleach concentrate into one sanitizing container, then switch the Nautilus panel to Power Fill Mode to speed up filling the freshwater tank. 
    • Monitor your tank levels carefully to avoid overfilling. 
  4. Once the freshwater tank is full, set the Nautilus panel to Dry Camping Mode. 


Step 3: Circulate the Sanitizing Solution


Run the bleach solution through all faucets and fixtures, including: 

  • Kitchen sink 
  • Bathroom sink 
  • Interior shower 
  • Outdoor shower 


Be sure to run both hot and cold lines at each fixture. Allow the solution to sit in the system for the recommended sanitizing time (12 hours if using the standard dilution ratio). 


Step 4: Drain the System Again 


After sanitizing is complete: 

  1. Open the hot and cold low-point drains. 
  2. Drain the gray tank. 
  3. Drain the freshwater tank. 
  4. Drain the Hot Water Tank (Alde System). To drain the hot water tank: 
    • Locate the Alde relief valves under the dinette bench. 
    • Remove the cushions. 
    • Remove the screws securing the panel cover. 
    • Open the relief valves and allow the tank to fully drain. 
    • Once all components have drained completely, close all valves and drains. 


Step 5: Flush with Fresh Water 


Now it’s time to remove the bleach solution from the system. 

  1. Set the Nautilus panel to Power Fill Mode and refill the freshwater tank with clean water. 
  2. Switch to Dry Camping Mode. 
  3. Turn on the water pump. 
  4. Run fresh water through all faucets and fixtures (both hot and cold lines). 
  5. You may need to refill and flush the system multiple times to eliminate any residual bleach smell or taste. 


Step 6: Final Drain After Flushing 


Drain the system one final time and turn off the water pump. 


You're Ready for Camping Season 


Your Haven 220 is now fully dewinterized and ready for your next adventure. If you have any questions, you can contact our Customer Experience team at help@nucamprv.com or our technical support team at tech@nucamprv.com.