How to Winterize Your RV Water System Properly

If you store your RV in cold weather, failing to winterize the plumbing can lead to cracked pipes, damaged fittings, and expensive repairs. Learning how to winterize your RV water system properly protects your investment and ensures everything’s ready when spring rolls around.

Why Winterizing Matters

When water freezes, it expands—and in your RV, that means:

  • Bursting water lines
  • Cracked faucets or toilets
  • Damaged water pump and valves
  • Leaks that go unnoticed until your next trip

By winterizing correctly, you avoid costly plumbing repairs and can hit the road faster when it warms up.

What You’ll Need

Before starting, gather:

  • Non-toxic RV antifreeze (NOT automotive antifreeze)
  • A water heater bypass kit (if not already installed)
  • A water pump converter kit or siphon hose
  • A socket wrench and basic tools
  • Optional: air compressor for blow-out method

Not sure what you need? Daisy RV can provide all winterization supplies or handle it for you.

Step-by-Step Winterization Process

  1. Drain the fresh water tank and water heater
    • Turn off water heater and let it cool.
    • Open the drain plug and pressure relief valve.
  2. Bypass the water heater
    • Engage the bypass valve or install a bypass kit.
    • This keeps antifreeze from filling the heater.
  3. Drain all plumbing lines
    • Open all faucets, showers, and toilets.
    • Don’t forget the low-point drains.
  4. Blow out lines (optional)
    • If using compressed air, set pressure under 50 PSI.
    • Blow air through all lines until no water remains.
  5. Pump antifreeze through the system
    • Use a pump kit or siphon into the system.
    • Open each faucet (hot and cold) until pink fluid flows.
    • Flush the toilet and run outside showers.
  6. Pour antifreeze down all drains
    • About 1 cup per drain to protect the traps.
  7. Turn off the water pump and close all faucets
    • Your RV is now protected from freezing damage!

When to Winterize

  • Before temperatures drop below freezing
  • Anytime the RV will sit unused for weeks in cold weather
  • After your final fall trip or before off-season storage

Learning how to winterize your RV water system properly helps you avoid plumbing nightmares and keeps your RV in top shape year after year.

For expert winterizing services, visit Daisy RV before the cold hits!

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