5 Best Water Heater Bypass Valves for RV Winterization That Save Time & Money

Protecting your RV’s water heater during winter months isn’t just recommended—it’s essential. Without proper winterization using a quality bypass valve, you’re risking expensive damage from freezing temperatures that can crack your tank and plumbing system.

We’ve researched and tested dozens of options to bring you the five best water heater bypass valves that make winterizing your RV quick and efficient. These top-rated valves allow you to bypass your water heater when adding antifreeze, saving you money and ensuring complete protection throughout the cold season.

Disclosure: As an Amazon Associate, this site earns from qualifying purchases. Thank you!

Why RV Water Heater Bypass Valves Are Essential for Winter Protection

When winter approaches, protecting your RV’s water system becomes critical. RV water heater bypass valves serve as a fundamental component of proper winterization, preventing costly damage to your water heater and plumbing system. Without a bypass valve, you’d need to fill your entire water heater (typically 6-10 gallons) with expensive antifreeze, wasting both product and money.

A quality bypass valve allows you to circumvent the water heater tank during winterization, directing antifreeze straight to your plumbing system while using significantly less product. This not only saves you money but also ensures more thorough protection throughout your RV’s water lines.

Installing a bypass valve creates an efficient path for antifreeze to flow through your system, avoiding dilution that occurs when antifreeze mixes with water left in the tank. This maintains the freeze protection properties of your antifreeze solution, providing reliable protection even in extreme temperatures.

Beyond cost savings, bypass valves simplify the entire winterization process. They reduce the time needed to prepare your RV for winter storage and make springtime de-winterization faster and more straightforward. This convenience translates to more time enjoying your RV and less time on seasonal maintenance.

How to Choose the Right Water Heater Bypass Valve for Your RV

Selecting the proper bypass valve for your RV’s water heater is crucial for effective winterization and long-term maintenance of your water system. The right choice will save you time, money, and prevent potential damage to your RV.

Key Features to Consider

When choosing a bypass valve, accessibility should be your top priority. Opt for valves that are easy to reach, especially if they’re hidden behind panels or under drawers. Look for durable materials like brass or stainless steel that withstand travel vibrations and temperature fluctuations. The valve should operate smoothly with clear indicators for bypass mode. Finally, ensure compatibility with your specific RV’s plumbing system and water heater model.

Understanding Valve Types and Materials

RVs typically use one of three bypass systems: one-valve, two-valve, or three-valve configurations. One-valve systems are simplest but least common, using a single valve at the cold water line. Two-valve systems include valves at both cold inlet and hot outlet points. Three-valve systems offer the most control with valves at both water lines plus the bypass line. For materials, brass provides excellent durability and corrosion resistance, while high-quality plastics offer affordability with decent performance. Always verify your RV’s existing configuration before purchasing.

5 Best Water Heater Bypass Valves for RV Winterization

1. Camco RV Water Heater Bypass Kit

Camco’s bypass kit simplifies the winterization process by efficiently preventing antifreeze from entering your water heater tank. The kit includes easy-to-install valves and durable hoses specifically designed for RV plumbing systems. Known for exceptional durability and user-friendly design, this popular kit provides reliable performance season after season, making it a go-to choice for many experienced RV owners.

2. Valterra 3-Valve Winterizing Kit

Valterra’s 3-valve configuration delivers precise control over water flow, ensuring complete isolation of your water heater during winterization. The three-valve setup allows for more accurate direction of antifreeze throughout your plumbing system while protecting your water heater. RV owners consistently praise this kit for its reliability, straightforward operation, and ability to create an effective seal that prevents antifreeze waste.

3. RVMATE Premium Bypass Valve System

The RVMATE system stands out with its premium construction materials designed to resist heat and aggressive water conditions. It features convenient color-coded hose fittings that clearly distinguish between hot and cold water inlets, eliminating installation confusion. This system meets rigorous safety standards including NSF-61-9 and UPC/NSF Component Certification, ensuring both performance and peace of mind during winter storage.

4. JR Products 62203 Permanent Bypass Kit

JR Products offers a comprehensive permanent solution that eliminates the need for frequent valve adjustments after initial installation. This all-inclusive kit contains every component required for a complete bypass system—valves, hoses, and fittings. The permanent design provides exceptional long-term reliability with minimal maintenance, making it perfect for RV owners seeking a “set it and forget it” winterization solution.

5. Lasco Plumbing Specialty Diverter Valve Kit

Lasco’s diverter valve kit effectively redirects water flow around your water heater during the winterization process with simple valve adjustments. Constructed from quality materials, these valves withstand the pressures and chemicals involved in seasonal maintenance procedures without deteriorating. The kit includes clear instructions for proper valve positioning in bypass mode, ensuring even first-time users can successfully protect their RV water systems.

Step-by-Step Guide to Installing an RV Water Heater Bypass Valve

Preparation

Before starting the installation process, you’ll need to locate your RV’s water heater tank. It’s typically positioned on the exterior of your RV behind a protective cover. Once located, identify both the cold water inlet line and the hot water outlet line connected to your water heater. These lines are essential components that you’ll be working with during the installation process.

Installation Steps

1. Disconnect the Lines

Begin by disconnecting both the cold water inlet and hot water outlet lines from your water heater. This provides the necessary access points for installing your new bypass valve system. Ensure your RV’s water system is depressurized before disconnecting any lines to prevent unexpected water spray.

1. Install the Valve Fittings

Twist port A of the first valve fitting securely into the hot outlet of your water heater. Connect the hot water line to the C port on this valve fitting, ensuring a tight connection. Attach the bypass line to the B port of this valve fitting to create the first part of your bypass circuit.

1. Connect the Cold Water Line

Take the second valve fitting and connect the cold water inlet line to its B port. This creates the connection point for the cold water side of your bypass system. Make sure all connections are snug but avoid overtightening, which could damage the fittings.

1. Install the Bypass Line

Connect the bypass line between the two valve fittings you’ve installed. This crucial line allows water to flow directly between the cold and hot water lines, completely bypassing the water heater when the valves are set to bypass mode. Ensure this line is securely attached at both ends.

1. Position the Valves

Set your valves to the appropriate position based on your system type. For a two-valve system, turn both valves parallel to the line for bypass mode. With a three-valve system, position the valves on cold and hot water lines perpendicular to the line and turn the bypass valve parallel. For a one-valve system, turn the valve perpendicular to create the bypass effect.

1. Test the System

Turn on your RV’s water pump and thoroughly check all connections for leaks. Verify that your bypass valve functions correctly by confirming water flows through the bypass line when the valves are set to bypass mode. This test ensures proper installation before proceeding with winterization.

Common Mistakes to Avoid When Winterizing Your RV Water System

Incorrect Valve Configuration

When winterizing your RV, setting bypass valves incorrectly is one of the most common and costly mistakes. Improper valve positioning can allow antifreeze to enter your water heater, potentially damaging its metal lining and internal components. Always verify that the valve handles align with the crossover line to ensure water flows around—not through—your water heater.

Not Draining the Water Heater Separately

Your water heater requires separate draining before the winterization process begins. Failing to drain it independently from your main plumbing system leaves water trapped inside that can freeze and expand, causing cracks in the tank. Remove the drain plug and pressure relief valve to allow complete drainage before proceeding with antifreeze application.

Not Following the Owner’s Manual

Every RV has unique plumbing configurations that require specific winterization procedures. Skipping your owner’s manual instructions can lead to overlooked components and incomplete protection. Your manual contains model-specific bypass valve operations and winterizing steps designed for your particular RV’s plumbing layout.

Leaving Water in the Lines

After blowing out water lines, residual water often remains in low points or corners of your plumbing system. These hidden pockets can freeze and rupture pipes during winter storage. Use compressed air thoroughly throughout all lines, and consider adding antifreeze as secondary protection against any remaining moisture.

Ignoring Complex Panel Instructions

Modern RVs with integrated panels require precise valve sequence operations for proper winterization. Misinterpreting the winterizing diagram can leave critical sections of your plumbing vulnerable to freezing. Take photos of each valve position before making changes, and follow the panel instructions methodically to ensure complete system protection.

Conclusion: Protecting Your RV Investment with the Right Bypass Valve

Choosing the right water heater bypass valve is a critical step in safeguarding your RV during winter months. The five options we’ve reviewed offer reliable performance that will protect your investment for years to come.

Remember that proper installation and operation of your bypass valve not only saves you money on antifreeze but also prevents potentially expensive damage to your water heater system.

By understanding the different types of valves and following proper winterization procedures you’ll extend your RV’s lifespan and enjoy worry-free travels when warmer weather returns. Take time to select the right bypass valve now and you’ll thank yourself when spring arrives with your plumbing system intact and ready for your next adventure.

Frequently Asked Questions

Why do I need a water heater bypass valve for my RV?

A water heater bypass valve prevents you from wasting expensive antifreeze by directing it straight to your RV’s plumbing system instead of filling the water heater tank. This saves money, reduces winterization time, and protects your entire water system from freezing damage during winter months. It also makes the spring de-winterization process much simpler and more efficient.

What are the different types of RV water heater bypass systems?

There are three main types: one-valve, two-valve, and three-valve configurations. The one-valve system is the simplest but offers less control. Two-valve systems provide better functionality with moderate complexity. Three-valve systems offer the most precise control over water flow, allowing complete isolation of the water heater during winterization, though they require more installation work.

How do I choose the right bypass valve for my RV?

Select a bypass valve based on accessibility, material durability (brass or stainless steel preferred), smooth operation, and compatibility with your RV’s plumbing system. Consider the space available near your water heater and your comfort level with installation complexity. The right choice depends on your specific RV model and personal winterization preferences.

Can I install an RV water heater bypass valve myself?

Yes, most RV owners can install a bypass valve themselves with basic plumbing tools. The process involves locating your water heater, identifying inlet and outlet lines, disconnecting these lines, installing valve fittings, and testing for leaks. However, if you’re uncomfortable with plumbing work, consider professional installation to avoid potential water damage.

What are the most common mistakes when using a bypass valve?

The most common mistakes include incorrect valve configuration (allowing antifreeze into the water heater), failing to drain the water heater separately, not following your RV’s specific winterization procedures, leaving residual water in the lines that can freeze, and misinterpreting complex control panel instructions on modern RVs. Always refer to your owner’s manual for guidance.

How often should I replace my RV water heater bypass valve?

Quality bypass valves typically last 5-10 years depending on usage and material quality. Replace your valve if you notice leaks, difficulty turning the valves, mineral buildup affecting performance, or visible corrosion. Regular inspection during seasonal maintenance can help identify issues before they cause damage to your RV’s water system.

What’s the difference between cheap and premium bypass valve kits?

Premium bypass valve kits like Camco or RVMATE typically feature higher-quality materials (brass or stainless steel instead of plastic), better seals that prevent leaks, smoother valve operation, clearer installation instructions, and longer warranties. While they cost more initially, premium kits generally last longer and provide more reliable protection for your RV’s water system.

When should I bypass my RV water heater?

Bypass your RV water heater when winterizing your rig before storage in freezing temperatures, when sanitizing your freshwater system (to avoid filling the water heater with sanitizing solution), and when performing maintenance on your water heater. Always return valves to their normal operating position before using your RV’s water system normally.