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.

Guide to the Nautilus P3 System

This article and video applies to any nuCamp model equipped with the Nautilus P3.


The Nautilus P3 system is used in the 2025 TAB 320, TAB 360, TAB 400, Cirrus 620, Cirrus 820, and Cirrus 920 models to streamline water management by centralizing essential functions. Below is an overview of its components, functions, and modes.




Step 1: Understanding the Nautilus Panel Components

The front panel of the Nautilus system includes the following key components:

  • City Water Hookup – Connects to city water for direct supply.
  • Black Tank Flush Hookup – Used to clean out the black tank by flushing it with fresh water.
  • Coax Connection for Interior TV – Provides a TV connection inside the camper.
  • Water Pump Switch – Turns on the water pump (identical to the interior pump switch).
  • External Shower – Allows access to hot and cold water outside the camper.
  • Mode Selection Knobs – Adjusts the system’s settings for different functions.
  • Instruction Key Sticker – Provides visual guidance on knob positions for each mode.

Step 2: Nautilus Panel Modes

1. Dry Camping Mode

  • Allows you to pump water from the freshwater tank to your fixtures.
  • Ensure the pump is turned on, either at the Nautilus panel or inside the camper.

2. Power Fill Mode

  • Used to fill the freshwater tank using a garden hose.
  • Connect the hose to the City Water Hookup and allow it to fill the tank.

3. City Water Mode

  • Directly supplies water from a city water connection to your fixtures, bypassing the freshwater tank.
  • No need to use the pump in this mode.

4. Sanitize Mode

  • Used when de-winterizing or sanitizing the system.
  • Connect a bucket or container to the City Water Hookup and siphon liquid into the fresh tank.

5. Winterize Mode

  • Used only during winterization to run RV antifreeze through the system.

Step 3: Using the Black Tank Flush

  • Connect the city water hose to the Black Tank Flush Hookup.
  • This allows fresh water to be forced through the black tank, helping flush out residual waste.

Important Notes:

  • Always use an inline water pressure regulator when connecting to city water (included in your welcome pack).
  • Follow the instructional sticker on the Nautilus panel for proper knob positioning.


***


How to Flush the Black Tank


The black tank flush is a useful feature that helps you maintain your RV’s black tank. Whether you're prepping for storage, maintaining accurate tank sensor readings, or simply keeping your tank clean, using the black tank flush can make a big difference in the longevity and functionality of your system.


When Should You Use the Black Tank Flush?

You might consider using the black tank flush in the following situations:

  • Tank sensors are reading inaccurately: If your monitor panel shows incorrect readings, residue buildup could be to blame.

  • Before winter storage: Flushing the tank before storing your RV can prevent unpleasant odors and buildup.

  • Regular maintenance: Periodic flushing helps reduce the buildup of gunk and keeps the tank in good working condition.

How to Use the Black Tank Flush

Follow these steps to safely and effectively use the black tank flush:

  1. Hook up your sewer hose
    Always ensure your sewer hose is properly connected to a dump station or appropriate waste outlet.

  2. Locate the black tank flush inlet
    This is usually labeled and located on the exterior of your RV.

  3. Connect a garden hose
    Attach one end of a garden hose to the black tank flush inlet.

  4. Connect the other end to a water source
    Use a hose that is separate from your drinking water hose, and always connect through an inline pressure regulator to avoid over-pressurizing the system.

  5. Monitor tank levels
    It’s important not to overfill the tank. You can monitor your tank levels in one of two ways:

    • Use your tank monitor panel to keep an eye on the black tank fill level.

    • Open the toilet valve and visually inspect the tank level.

  6. Stop the flush when nearly full
    Once the tank is nearly full, shut off the water and disconnect the hose.

  7. Empty the black tank
    Drain the contents of the black tank into the sewer connection.

Need Help?

If you have any questions or need assistance, feel free to reach out to our tech team at Tech@nucamprv.com.