RV Winterizing in Florida: Water Heater Bypass Mistakes

Down here, nobody winterizes like they do up north — and honestly, most winters you don't need to. Then one January night drops to 25 degrees until sunrise, and I get the spring calls: split toilet valve, cracked pump housing, a faucet that sprays the cabinet. Water expands about 9 percent when it freezes, and it doesn't need a week of cold to do damage. It needs one night, a little water left in the wrong fitting, and nobody home. Here are the mistakes I see, starting with the one that wastes the most money.

Mistake 1: Filling the water heater with pink stuff

The bypass exists for one reason: to route water around the tank instead of through it. Skip it and your pump happily fills a 6- or 10-gallon water heater with antifreeze before a drop reaches a faucet. That's gallons of pink wasted, a tank that takes forever to flush clean in the spring, and antifreeze sitting against the anode rod all winter doing it no favors. A small travel trailer should winterize on 2 to 3 gallons total. If you're buying six, your bypass isn't bypassing.

If your rig has no bypass, add one once and winterizing gets cheap forever. I install the Camco water heater by-pass kit — brass valves and a reinforced hose that go in permanently, so next year it's two valve turns and done. As an Amazon Associate I earn from qualifying purchases.

Mistake 2: Guessing at the valves — and never draining the tank

Bypass setups come in one-, two-, and three-valve flavors, and some rigs use a check valve instead of a third handle. Turning "the valves" without knowing which system you have is how antifreeze ends up in the tank anyway — or how spring arrives with no hot water because a valve is still crossed. Learn your setup before the pump runs: in bypass mode, the valves into and out of the heater close and the crossover opens.

And bypassing is not draining. Kill the water heater's power and propane, let it cool, shut off the pump and city water, open the pressure relief valve, and pull the drain plug or anode rod. A full tank with the valves closed is still a full tank — and it's the biggest single block of water on the rig.

Mistake 3: The wrong antifreeze

This one is not a money mistake, it's a safety mistake. Automotive antifreeze is ethylene glycol and it is toxic — it never goes in a drinking water system, period. RV antifreeze is propylene glycol, non-toxic, usually rated to -50 degrees, and it's the pink stuff for a reason. If the jug doesn't say RV and potable-water safe, it doesn't go in the lines.

Mistake 4: Forgetting the fixtures that actually crack

In Florida, the big lines rarely lose. The small, cheap, water-trapping parts do:

• The toilet valve. It holds water after everything else drains. Run pink through the flush until it shows, and leave a little in the bowl to keep the seal wet.
• The water pump and its strainer bowl. Blowing out the lines from the city inlet does not clear the pump. A Camco pump converter kit lets the pump draw antifreeze straight from the jug and protect itself while it fills the lines.
• P-traps. Air doesn't empty a trap. Pour pink down every sink and the shower drain.
• The outside shower, ice maker line, and washer hookups if you have them. The outside shower is the most-forgotten fixture on the rig, and it's the most exposed.
• The water filter. Pull the cartridge before antifreeze goes in, or you'll be drinking pink-flavored filter all spring.

Mistake 5: Blowing out with unregulated shop air

Air is a fine way to clear lines — at the right pressure. A shop compressor set to 100-plus PSI can split fittings and damage faucet cartridges. Regulate it down to 30 to 40 PSI, open one faucet at a time, hot and cold, and work farthest to nearest. I use a Camco brass blow out plug at the city inlet so the connection seals and my hands stay free. And remember: air clears lines, not traps, toilet valves, or the pump. Pink still finishes the job.

What I actually do in Central Florida

For a rig staying here, my standard is a light winterize done right: drain the fresh tank, low-point drains, and water heater; bypass the heater; blow the lines at low pressure; then run pink through the pump and every fixture, traps and toilet included. That's an hour and a few dollars, and it covers every freeze night this state normally throws at us. If the rig is heading north, sitting unheated through January and February, or the forecast shows days — not hours — below freezing, do the full antifreeze fill instead of just the fixtures.

One last one, because I hear it every spring: flip the bypass back and refill the water heater before you fire it up. An electric element switched on in a dry, bypassed tank burns out in seconds. Fill it, purge the air at a hot faucet, then heat it.

Winterizing isn't about surviving Alaska. It's about the one cold night you weren't thinking about. Drain it, bypass it, protect the small parts, and the freeze can do its worst — you'll never know it tried.