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Winterized RV

An RV with its water systems drained and protected against freezing damage, typically with non-toxic antifreeze in the lines.

Also called: winterized RV, winterized status, RV antifreeze

A winterized RV has had its water systems drained and protected against freezing damage. Most rental fleets winterize October-November and de-winterize April-May. Affects renters in shoulder season (March-May, October-November).

What winterization includes

  • Fresh water tank drained
  • Water heater bypassed and drained
  • Pink RV antifreeze pumped into water lines
  • Faucets opened and flushed
  • Drain valves left open
  • Tank treatment added to black tank (preventing odor over storage)

Visible signs of winterization

When you pick up the rig, check for:

  • Pink antifreeze in toilet bowl, sink drains, shower drain
  • Strong “antifreeze” smell if not fully flushed
  • Stickers on faucets or near water connections indicating winterization
  • Tape over water inlets

De-winterization at pickup

A properly de-winterized rig should have:

  1. Fresh water tank refilled with clean water
  2. All faucets run until clear water flows
  3. Water heater drained, refilled, and tested
  4. Toilet flushed until no pink color
  5. Shower drain run until clear

If antifreeze remains, ask the rental company to complete de-winterization before driving. Don’t drive away with antifreeze in your drinking water system.

Pink antifreeze vs. green antifreeze

Pink RV antifreeze:

  • Non-toxic to humans (safe for drinking water systems after flushing)
  • Specifically formulated for RV plumbing
  • Required to keep water from freezing at -50°F to -100°F
  • Used in fresh water tanks, pipes, water heater

Green automotive antifreeze:

  • Toxic
  • Never used in RV plumbing
  • Only in engine cooling system (motorhomes)
  • Don’t confuse the two

When to suspect incomplete de-winterization

  • Bitter or “chemical” taste in tap water
  • Pink color in any drain
  • Strong sweet smell from drains
  • Reduced water pressure (antifreeze in lines)
  • Faucet flow inconsistent

Address before drinking, cooking, or showering.

Self-winterization in cold weather

If your rental is in cold weather and you’ll experience freezing temperatures:

  1. Drain water tanks and water heater before extended cold
  2. Add antifreeze to lines to prevent freeze
  3. Use cassette toilet or skip toilet during freeze
  4. Disconnect shore water hose to prevent freeze

Some rentals are equipped with heated underbelly tanks that prevent freezing. Confirm at pickup if winter use is planned.

Returning a winter-rental

Some rental contracts require renters to winterize at return if the rig was used below freezing. This is rare for short rentals but possible for monthly winter rentals.

Procedure if required:

  1. Drain fresh water tank
  2. Add antifreeze to lines
  3. Bypass and drain water heater
  4. Document with photos

Confirm requirements at booking; some fleets handle this themselves.

Renter precaution: bring drinking water

In early-season rentals where you’re uncertain about full de-winterization, bring 5-10 gallons of bottled water for drinking and cooking. Use rental water for showering and dishwashing only until you’ve verified clean water.