How to Dewinterize Your RV: A Step-by-Step Guide for Camping Season
Dewinterizing an RV means getting the antifreeze out, cleaning the fresh water system, and checking for damage from months in storage. A missed step can leave you with a leak, a damaged water heater, or a plumbing problem on your first trip. This guide explains how to dewinterize your RV in the right order, from flushing the water lines to checking the propane system, tires, and batteries. You'll also learn how to power a few pre-trip checks when there's no shore power nearby.
Before You Start: Tools and Safety
Set aside a few hours to dewinterize your RV. Keep your owner's manual nearby because plumbing layouts and winterizing procedures vary between models. Gather your supplies before turning on the water. You'll need:
Drinking-water-safe hose and pressure regulator: Use these to connect to the RV's city water inlet without exceeding the recommended water pressure.
Household bleach and measuring cup: Keep these handy if your manufacturer recommends sanitizing the fresh water system.
Bucket and funnel: Use them to collect water from drain points or add liquids where needed.
Gloves and flashlight: Gloves help keep your hands clean, while a flashlight makes it easier to inspect plumbing connections and storage compartments.
Owner's manual: Check it for the correct flushing, sanitizing, and water heater procedures.
Before starting, open the windows, roof vents, and storage compartments to air out the RV. Check for cracked hoses, loose fittings, water damage, or signs of rodents, and follow your manufacturer's instructions. You can also review how an RV electrical system works before restoring power. Once the water system is flushed, sanitized, and checked for leaks, move on to the electrical checks. If you're working without shore power, a portable power station can run work lights, charge tools, and test compatible onboard equipment.
Powering the Pre-Trip Check Without Shore Power
You don't need shore power to flush the water lines or inspect most of the RV. But you'll need electricity for work lights, phones, tool battery chargers, and some 120V equipment. A portable power station can help with those checks when there's no outlet nearby. The size you need depends on what you're powering. A small unit can handle basic inspection tasks, while a larger one with a compatible 30A outlet can supply power through an RV's shore inlet for testing onboard devices one at a time.
EcoFlow DELTA 3 Classic for lights and tools
Most dewinterizing jobs don't require much power. You might need a work light under the sink, a phone charger, or a charger for cordless drill batteries. The EcoFlow DELTA 3 Classic has a 1,024Wh LFP battery and 1,800W AC output, making it suitable for these smaller tasks.
EcoFlow DELTA 3000 Gen4 for testing RV circuits
If you need to check the RV's own 120V outlets and appliances without a campground hookup, you'll need a power source that matches its shore inlet. The EcoFlow DELTA 3000 Gen4 has a 30A outlet and a 3,072Wh LFP battery. It can supply power to a compatible 120V/30A RV through its existing shore connection.
How the two products divide the job
The two EcoFlow power stations suit different needs, depending on the equipment you want to use during your pre-trip checks:
EcoFlow DELTA 3 Classic: Best suited for smaller tasks such as running work lights, charging phones, and powering cordless tool battery chargers.
EcoFlow DELTA 3000 Gen4: Designed for compatible 30A RVs when you need to check onboard 120V devices one at a time through the RV's existing wiring.
Estimated energy use
Task (example) | Energy used | EcoFlow DELTA 3 Classic (870Wh usable est.) | EcoFlow DELTA 3000 Gen4 (2,611Wh usable est.) |
LED work light 4 hours + phone + two drill battery charges (placeholders) | about 200Wh | about 23% of usable capacity | about 8% |
Testing microwave 5 minutes + water pump + lights through RV panel (placeholders) | about 300Wh | n/a (no 30A connection) | about 11% |
These are estimates, and actual consumption depends on the devices and how long they run. Before connecting a power station to your RV, review how RV shore power works to check the inlet, cord, and connection requirements. Complete your plumbing and safety checks first, and never use a power station to test equipment you suspect is faulty.
Step-by-Step: Flushing the Water System
Connect a drinking-water-safe hose to the RV's city water inlet and use a pressure regulator. Follow your owner's manual for the recommended water pressure. Then work through the plumbing in this order:
Open the low-point drains. Let the remaining water and antifreeze run out until the flow is clear, then close the drains.
Run the exterior shower. Open the cold side first, followed by the hot side. Let each run until the water clears.
Open the faucets one at a time. Check the kitchen sink, bathroom sink, toilet, shower faucet, and showerhead. Keep each running until the water looks clear and the sputtering stops.
Check the water filter. Reinstall any filter cartridges you removed before storage, following the manufacturer's instructions.
Don't rush through the fixtures. Antifreeze can remain in low spots or sections of plumbing that don't drain completely. If you used compressed air instead of antifreeze, check the water pump and plumbing according to your RV and pump manuals before refilling. Your pump and plumbing still need a careful inspection. Once the lines run clear, you can move on to sanitizing the fresh water system.
Sanitizing the Fresh Water System
Flushing removes antifreeze, but it doesn't sanitize the tank and plumbing. Many RV manufacturers recommend sanitizing the fresh water system after winter storage. The process usually involves diluted household bleach, followed by a thorough rinse. Check your owner's manual for the correct amount and contact time.
How much bleach should you use?
The amount depends on your tank size and the manufacturer's instructions. For example, the Jayco owner's manual recommends:
Standard sanitizing solution: 1/4 cup of household bleach for every 15 gallons of tank capacity.
Stronger solution: 1/2 cup per 15 gallons, which provides a higher chlorine concentration and a shorter disinfection time.
These are Jayco's instructions, not a universal formula for every RV. Use the amount and contact time specified in your own manual.
Circulate the solution and rinse
Remove the water filter before adding the sanitizing solution if your manual directs you to do so. Fill the tank, add the diluted solution, and run the water pump to move it through the plumbing. Follow the manufacturer's instructions for how long the solution should remain in the system. After the required contact time, drain the tank and refill it with clean water. Run the faucets until the chlorine smell is gone. You may need more than one rinse to clear the lines. While the water system is being sanitized, check your refrigerator, too. If you're running an RV fridge on propane, start it ahead of your trip so it has time to cool. The water heater needs a separate check. Make sure it's full before restoring power or lighting the burner.
Refilling the Water Heater and Restoring Systems
Never turn on an RV water heater while its tank is empty. Doing so can damage the heating element or other components. First, restore the tank, set the water heater valves to the NORMAL operating configuration specified in your owner's manual, and remove air from the hot water lines.
Refill the water heater
Follow your water heater's manual and work through these steps:
Reinstall the anode rod or drain plug. Make sure it's properly fitted before adding water.
Restore the NORMAL valve configuration. Follow your RV or water heater manual. In a three-valve system, open the cold-water inlet and hot-water outlet valves, and close only the bypass valve connecting those lines. Other valve arrangements may differ. This restores water flow through the tank.
Open the kitchen hot water faucet. Let water run until the air clears and you get a steady flow.
Check the other hot water faucets. Open them one at a time to remove trapped air.
Confirm the tank is full. Once water flows steadily from the hot faucets, check the tank and connections for leaks.
After confirming the tank is full, restore the water heater according to its manual. If it uses propane, follow the manufacturer's startup instructions. Check the visible plumbing connections for leaks. A small amount of water around the pressure relief valve can be normal. If the valve weeps, follow the manufacturer's instructions for restoring its air gap. The water heater must be off and cool before you work around the valve.
Check the rest of the RV
The plumbing isn't the only thing that needs attention after months in storage. Before your first drive, inspect these areas:
Propane system: Check connections and lines for leaks using the method in your RV manual. Don't use an open flame to look for leaks.
Waste tanks: Add water and the recommended deodorant to the black and gray tanks. Leave enough water in the toilet bowl to cover the seal.
Tires: Check tire pressure and look for cracks, bulges, or other visible damage.
Roof and seals: Look for cracks, loose sealant, and signs of water intrusion.
Batteries: Inspect connections and check the charge level. After months in storage, charge your RV battery according to its type and manufacturer's instructions.
Safety alarms: Test the smoke, carbon monoxide (CO), and LP gas detectors. Follow the manufacturer's instructions for testing and replacement.
Once these checks are complete, you're close to being ready for the road. But what if you're doing all this in a storage yard or driveway without an electrical hookup?
Conclusion
De-winterizing your RV takes a little time, but following the right order can help you avoid plumbing leaks and water heater damage. Flush the antifreeze, sanitize the fresh water system according to your manual, refill the water heater before switching it on, and inspect the tires, roof, propane connections, batteries, and safety alarms. Keep a checklist so you don't miss anything before your first trip. If you're working in a storage yard or driveway without shore power, the EcoFlow DELTA 3 Classic can run work lights and tool chargers. For a compatible 30A RV, the EcoFlow DELTA 3000 Gen4 can supply power through the shore inlet while you check onboard 120V devices one at a time. Choose based on the equipment you need to test, and confirm the connections before use.
FAQs
How do I dewinterize my RV?
Flush antifreeze from the water lines, sanitize the fresh water system according to your owner's manual, and refill the water heater with its valves set to the NORMAL operating configuration specified in the manual. Then check for leaks and inspect the tires, roof, propane connections, batteries, and safety alarms.
How much bleach do I use to sanitize an RV water tank?
The amount depends on your RV manufacturer's instructions. For example, the Jayco manual recommends 1/4 cup of household bleach per 15 gallons of tank capacity for its standard sanitizing solution. Check your own manual for the correct amount and contact time.
Can I turn on the water heater right away?
No. Reinstall the anode rod or drain plug, set the water heater valves to the NORMAL operating configuration specified in the manual, and let the tank fill completely. Run the hot water faucets until water flows steadily and the air is cleared. Check for leaks before turning on the heater to avoid damaging the heating element.
Do I need to sanitize my RV water system every spring?
Many RV manufacturers recommend sanitizing the fresh water system after winter storage. Follow your owner's manual for the correct bleach amount and contact time, then drain and rinse the system until the chlorine smell is gone.
How do I power my RV during dewinterizing without a hookup?
A portable power station can run work lights, phones, and tool chargers. If you need to test the RV's 120V outlets, choose a unit with a compatible 30A connection and check devices one at a time through the RV's existing wiring.
For press requests or interview opportunities, reach out to our media team
media.na@ecoflow.com