Winter brings beauty, but it also brings freezing temperatures that can damage your RV’s most important systems. If you own an Apus RV tankless water heater, winterizing it is essential to keep your investment safe and ready for the next adventure. Many RV owners skip this step or do it incorrectly, leading to costly repairs and disappointing spring trips. This guide will help you protect your heater, avoid common mistakes, and ensure smooth operation when the seasons change.
Why Winterize Your Apus Rv Tankless Water Heater?
Your tankless water heater is designed to deliver hot water efficiently, but cold weather can cause serious problems. If water freezes inside the unit, it expands and cracks pipes or internal parts. Unlike traditional tank heaters, a tankless system does not store much water, but even a small amount can cause expensive damage. Proper winterization also prevents mineral buildup and corrosion, which could shorten the heater’s life.
Many RVers think draining water is enough. However, Apus tankless heaters have sensitive electronics and valves that need extra care. Taking the right steps will save you money, time, and headaches.
When Should You Winterize?
The best time to winterize is before temperatures drop below 32°F (0°C). Even one cold night can cause freezing, so don’t wait for the first frost. If your RV will be unused for weeks or months in winter, always winterize. For short periods, you may be able to keep the heater running, but this risks high energy use and possible power failures.
What You’ll Need
Before starting, gather these supplies:
- Non-toxic RV antifreeze (propylene glycol-based)
- Basic tools: Adjustable wrench, screwdriver
- Bucket or container for draining water
- Hose for flushing (preferably flexible and food-grade)
- Owner’s manual for your Apus heater (reference specific instructions)
- Protective gloves and towels
- Compressed air (optional, for extra thoroughness)
Having everything ready makes the process smoother and prevents mistakes.
Step-by-step Guide: How To Winterize An Apus Rv Tankless Water Heater
1. Turn Off Power And Gas
Safety comes first. Switch off the heater’s power supply at the breaker box or disconnect the battery. Turn off the propane gas valve if your heater uses gas. This prevents accidental activation and protects sensitive electronics.
2. Shut Off Water Supply
Close the main water supply valve leading to the heater. If your RV has bypass valves, set them to bypass the heater. This makes draining easier and stops new water from entering the system during winterization.
3. Drain The Water Heater
Find the drain valve or plug on your Apus heater. Place a bucket underneath, then open the drain to let all water flow out. Some models have a small filter screen—remove and clean it to avoid clogs. Don’t forget to drain hot and cold lines connected to the heater.
If your RV has a separate drain for the tankless heater, use it. Otherwise, draining through the main RV system works, but may leave small amounts behind.
4. Flush The Heater (optional But Recommended)
Flushing removes leftover water, minerals, and sediment. Connect a hose to the heater’s inlet and flush with clean water for 5–10 minutes. If you have access to compressed air, gently blow through the lines to remove moisture. This step prevents buildup and keeps the heater working longer.
5. Add Rv Antifreeze
This is the most critical step. Use non-toxic RV antifreeze—never use automotive antifreeze, as it’s unsafe for plumbing. Follow these steps:
- Close all drains and valves.
- Set the heater bypass (if available) to direct antifreeze through the heater.
- Pour antifreeze into the RV plumbing system, using a pump or gravity feed.
- Open each hot water faucet until pink antifreeze flows out, confirming it reached the heater.
- Repeat for cold water lines if desired.
Check your Apus manual for exact bypass and antifreeze procedures, as models vary.
6. Protect Electronic Components
Moisture and cold can damage electronics. After draining and adding antifreeze, inspect the heater’s control panel and wiring. Dry any condensation and cover exposed parts with a protective plastic wrap or moisture barrier. This extra step prevents corrosion and electrical faults.
7. Secure And Insulate
If your heater is accessible from outside, make sure the compartment is clean and dry. Add foam insulation or a heater blanket around pipes and the heater body. This keeps out cold air and adds another layer of protection.
8. Record Your Steps
Write down what you did and when. Take photos if possible. This log helps you remember details and makes spring de-winterizing easier.
Common Mistakes To Avoid
Winterizing seems simple, but many RV owners make costly errors. Here are mistakes to watch for:
- Using automotive antifreeze: Only use RV-safe, non-toxic antifreeze. Automotive types can poison water and damage plumbing.
- Forgetting to flush and drain lines: Even a little water left can freeze. Always flush lines and check for hidden pockets.
- Skipping electronic protection: Cold and moisture can ruin circuit boards. Cover exposed electronics after winterizing.
- Not checking bypass valves: Some systems have hidden valves. Missed valves mean water stays in the heater.
- Ignoring the filter screen: Sediment in the filter can cause problems later. Always clean it during winterization.
- Not using enough antifreeze: If pink fluid does not flow from every faucet, add more until it does.
- Leaving insulation gaps: Cold air finds weak spots. Make sure insulation is tight around pipes and heater.
Apus Rv Tankless Water Heater Vs. Traditional Tank Heater: Winterization Comparison
Understanding the differences helps you avoid confusion. Here’s a clear comparison:
| Feature | Tankless (Apus) | Traditional Tank |
|---|---|---|
| Water Storage | Minimal | 20–50 gallons |
| Winterization Steps | Drain, flush, antifreeze, protect electronics | Drain tank, bypass, antifreeze |
| Risk of Freeze Damage | Higher (small parts freeze quickly) | Lower (but tank can crack) |
| Time Required | 30–45 minutes | 20–30 minutes |
| Electronic Protection Needed | Yes | Rarely |
This shows why tankless heaters need extra care. The risk is higher, but the rewards of proper winterization are greater.
How Much Antifreeze Should You Use?
The amount depends on your RV’s plumbing size and heater model. Most RVs require 2–3 gallons of RV antifreeze to cover all lines and appliances. For Apus tankless heaters, 1 gallon is often enough for the heater itself, but always check by running faucets until antifreeze appears.
Here’s a quick guide for different RV sizes:
| RV Size | Antifreeze Needed | Notes |
|---|---|---|
| Small Camper (under 20 ft) | 1–2 gallons | Minimal plumbing, one heater |
| Mid-size RV (20–30 ft) | 2–3 gallons | Multiple faucets, longer lines |
| Large RV (30+ ft) | 3–5 gallons | Many appliances, more complex |
Always err on the side of using more, not less. It’s better to waste a little antifreeze than risk freezing.
Practical Tips For A Trouble-free Winterization
Most guides cover the basics, but seasoned RV owners know a few extra tricks:
- Warm up the heater before draining. Running hot water loosens sediment and makes draining easier.
- Check for hidden valves: Some RVs have extra bypass valves in hard-to-find spots. Look near the heater and under sinks.
- Label pipes and valves: Use colored tape or tags. This makes spring startup faster and avoids confusion.
- Inspect for leaks: After adding antifreeze, check all connections for drips. Fix leaks before storing the RV.
- Store antifreeze bottles: Keep a spare in the RV for emergencies during winter travel.
These practical steps often prevent unexpected problems and save money.
Reversing The Process: De-winterizing Your Apus Heater
When spring arrives, you need to remove antifreeze and check the heater. Here’s how:
- Flush the system: Run fresh water through all lines until clear.
- Check the filter screen: Clean again before restarting.
- Inspect electronics: Remove covers, check for moisture or corrosion.
- Turn on power and gas: Test the heater’s operation—watch for error codes.
- Check for leaks: Run hot water and inspect all joints.
Don’t rush. It’s tempting to get started quickly, but careful de-winterization avoids surprises.
Data: Real Costs Of Winter Damage
Repairing a frozen tankless water heater can be expensive. Here are some real-world costs:
- Replacing cracked pipes: $150–$300
- New circuit board: $200–$400
- Full heater replacement: $700–$1,500
Most damage is preventable with proper winterization. Investing in antifreeze and a few hours of work saves hundreds or thousands in repairs.
Apus Rv Tankless Water Heater Maintenance Schedule
Regular maintenance extends heater life. Here’s a suggested schedule:
| Task | Frequency | Notes |
|---|---|---|
| Flush system | Every 6 months | Removes mineral buildup |
| Clean filter screen | Every 3 months | Check during winterization |
| Check electronics | Every 6 months | Protect from moisture |
| Inspect insulation | Annually | Before winter |
| Winterize | Annually | Before first frost |
Following this schedule prevents most issues and keeps your heater running smoothly.
Non-obvious Insights For Beginners
Many RV owners miss these points:
- Antifreeze can degrade over time. If it’s cloudy or separated, replace it before use. Old antifreeze loses effectiveness and may not protect against freezing.
- Tankless heaters have hidden sensors. Some Apus models include temperature sensors inside the unit. If these freeze, the heater may not work even if pipes are intact. Always protect electronics and check sensors during winterization.
Expert Guidance: What To Do If You Forget To Winterize
If you forgot to winterize and temperatures dropped, act fast:
- Thaw the heater gently: Use a hair dryer or space heater on low. Never use open flames.
- Check for leaks: Inspect pipes and heater for cracks or drips.
- Test electronics: Turn on power and check for error codes.
- Flush and drain system: Remove water, add antifreeze as soon as possible.
- Contact a technician if you see damage. Quick action can save the heater.
Frequently Asked Questions
How Often Should I Winterize My Apus Rv Tankless Water Heater?
You should winterize your Apus heater once each year before freezing temperatures. If you travel in winter or store your RV in cold climates, winterize every time you expect the heater to be unused for several weeks.
Can I Use Automotive Antifreeze In My Rv Tankless Water Heater?
Never use automotive antifreeze in your RV water heater. It is toxic and can damage plumbing and the heater. Always use RV-specific, non-toxic antifreeze designed for potable water systems.
What Happens If I Skip Winterization?
Skipping winterization risks freeze damage to pipes, valves, and electronic components. Repairs can cost hundreds or even thousands of dollars. Even mild winters can cause damage if temperatures drop below freezing.
Is It Necessary To Insulate The Heater Compartment?
Yes, adding insulation around the heater compartment and pipes is recommended. It prevents cold air from reaching sensitive parts and adds extra protection against freezing, especially if your RV is parked outdoors.
How Do I Know If All Antifreeze Has Reached The Heater?
Open each hot water faucet until pink antifreeze flows out. This confirms the antifreeze has filled the heater and plumbing. If the color is not visible, add more antifreeze and flush the system again.
Final Thoughts
Winterizing your Apus RV tankless water heater is not difficult, but it requires careful steps and attention to detail. The right supplies, proper technique, and a few expert tips can protect your heater from freeze damage, extend its lifespan, and save money in the long run. Always follow your owner’s manual and check for hidden valves and sensors. By making winterization a yearly habit, you’ll enjoy reliable hot water and avoid costly repairs when spring arrives.
For more information on RV winterization best practices, visit the official RV Industry Association. Safe travels and happy camping, no matter the season!
