Replace RV Water Heater With Tankless

Ever found yourself mid-shower in your RV, only for the hot water to suddenly run out? It’s a common frustration for many adventurers, especially when you’re trying to unwind after a long day of hiking or exploring. Traditional RV water heaters, with their limited tank capacity, often leave you rationing precious hot water, making quick showers and efficient dishwashing a constant challenge.

Imagine a different scenario: an endless supply of hot water, available on demand, whenever you need it. This isn’t a dream for your sticks-and-bricks home; it’s a reality you can achieve in your mobile basecamp. Many RVers are discovering the game-changing benefits of upgrading their hot water system. This guide will walk you through everything you need to know to replace RV water heater with tankless, transforming your outdoor living experience.

At OutwardLab, we’re all about living outdoors smarter. We believe your RV should be a comfortable, self-sufficient hub for adventure, not a source of daily inconveniences. This comprehensive guide will equip you with the knowledge, tips, and step-by-step instructions to confidently tackle this upgrade, ensuring you enjoy consistent hot water on all your journeys. Get ready to dive into the world of on-demand hot water and elevate your RV lifestyle!

Table of Contents

Why Replace RV Water Heater with Tankless? The Benefits of On-Demand Hot Water

Switching to a tankless RV water heater is more than just an upgrade; it’s a fundamental shift in how you experience comfort and efficiency on the road. The benefits extend far beyond simply having more hot water.

Uninterrupted Hot Water Supply

This is the most significant advantage. Tankless units heat water as it flows through, meaning you get a continuous supply. No more waiting for a tank to reheat, no more cold showers after the first person washes up. This is a massive improvement for families or anyone who enjoys longer showers.

Increased Energy Efficiency and Sustainability

Traditional tank water heaters constantly heat and reheat a reservoir of water, even when you’re not using it. This leads to standby energy loss. Tankless units only activate when you turn on the hot water tap, consuming energy only when needed. This makes them a more sustainable replace RV water heater with tankless option, reducing your propane or electric consumption and lessening your environmental footprint.

Space-Saving Design

Tankless water heaters are typically much more compact than their tanked counterparts. This can free up valuable storage space inside or outside your RV, which is always at a premium. Every inch counts in a mobile living space!

Reduced Weight

A full 6-gallon RV water heater tank weighs approximately 50 pounds. A 10-gallon tank weighs around 80 pounds. Tankless units, by design, don’t hold water, making them significantly lighter. This reduction in weight can contribute to better fuel economy and allow you to carry more gear.

Extended Lifespan and Reliability

Without a tank to rust or corrode, tankless units generally have a longer lifespan than traditional tank heaters. They also tend to be more reliable over time, provided they receive proper maintenance.

Is a Tankless RV Water Heater Right for Your Adventures?

While the benefits are compelling, a tankless system isn’t a one-size-fits-all solution. Consider these factors to determine if this upgrade aligns with your RVing style and needs.

Understanding Your Hot Water Demands

Think about how you use hot water. Do you take quick showers, or do you prefer longer, more luxurious ones? How many people are typically showering or washing dishes at the same time? Tankless units are rated by gallons per minute (GPM) and temperature rise. If you plan to run multiple hot water fixtures simultaneously, you’ll need a higher GPM unit.

Power Source Considerations

Most RV tankless water heaters are propane-fired. They require 12V DC power for their ignition and control board, but propane does the primary heating. Ensure your RV’s propane system and 12V electrical system can support the new unit.

Water Flow and Pressure

Tankless heaters require a minimum water flow to activate. If you frequently camp with low water pressure or rely on a small 12V water pump, you might encounter issues. Some units have flow sensors that prevent them from firing up if the flow is too low. Check the minimum flow rate requirements for any unit you consider.

Initial Cost vs. Long-Term Savings

The upfront cost of a tankless RV water heater is generally higher than a traditional tank unit. However, the long-term savings on propane (due to increased efficiency) can offset this initial investment over time. Factor in your typical usage and how long you plan to keep your RV.

Choosing the Best Tankless RV Water Heater: A Practical Guide

Selecting the right tankless unit is crucial for a successful upgrade. This section offers replace RV water heater with tankless tips for making an informed decision.

Key Features to Look For

BTU Rating: British Thermal Units (BTUs) indicate the heating power. Higher BTUs generally mean faster heating and better performance in colder incoming water temperatures.
Flow Rate (GPM): Gallons Per Minute (GPM) measures how much hot water the unit can produce. For simultaneous showers and dishwashing, look for 2.5 GPM or higher.
Temperature Rise: This is the difference between the incoming water temperature and the desired output temperature. Units perform better when the incoming water isn’t excessively cold.
Ventilation Requirements: Ensure the unit you choose can be properly vented in your RV’s existing water heater bay or a new location.
Freeze Protection: Essential for cold weather camping. Many modern units have built-in freeze protection to prevent damage.
Digital Controls: Allow precise temperature settings and often include diagnostic codes for easy troubleshooting.
Energy Source: Most RV tankless units are propane, but some electric or hybrid options exist.

Top Brands and Models

Research reputable brands known for quality and RV-specific designs. Some popular choices include:

Truma AquaGo: Highly regarded for consistent performance, rapid heating, and advanced freeze protection.
Girard Products: Offers various models with different flow rates and features, often designed for direct replacement of traditional units.
Furrion Tankless: Known for user-friendly controls and robust construction.

Always read reviews from other RVers and compare specifications to find the best fit for your rig and budget. Consider eco-friendly replace RV water heater with tankless models that prioritize efficiency.

Pre-Installation Checklist: Planning Your Tankless Upgrade

Before you start disconnecting anything, thorough preparation is key. This planning phase is part of the replace RV water heater with tankless best practices.

Gather Your Tools and Materials

Having everything on hand will make the installation process much smoother. You’ll likely need:

Basic hand tools (wrenches, screwdrivers, pliers)
Pipe thread sealant or Teflon tape
PEX crimping tool and fittings (if modifying water lines)
Propane leak detector spray
Voltmeter
Drill and bits
Silicone sealant
Replacement water lines (if needed)
New tankless water heater unit
Safety glasses and gloves

Safety First: Propane and Electrical Precautions

Working with propane and electricity in an RV requires extreme caution. Follow these safety steps:

Turn off propane: Shut off the main propane valve at the tank.
Disconnect power: Disconnect all shore power and turn off the RV’s 12V battery disconnect switch.
Ventilation: Ensure you are working in a well-ventilated area.
Read manuals: Thoroughly read both your RV’s owner’s manual and the new tankless water heater’s installation manual.

Measuring and Assessing Your Current Setup

Take precise measurements of your existing water heater bay. Check the dimensions of the new tankless unit to ensure it will fit. Consider the location of existing water lines, propane lines, and electrical connections. Some tankless units are designed as direct replacements, while others may require minor modifications.

How to Replace RV Water Heater with Tankless: Step-by-Step Guide

This section provides a general overview. Always refer to the specific instructions provided with your new tankless water heater for detailed guidance.

Step 1: Drain and Remove the Old Water Heater

Ensure propane is off and power is disconnected.
Open a hot water faucet inside the RV to relieve pressure.
Locate the drain plug on your existing water heater and drain all water.
Disconnect the water lines (hot and cold) from the back of the unit. Be prepared for residual water.
Disconnect the propane line. Use two wrenches to prevent twisting the line.
Disconnect any electrical wiring. Note which wires go where.
Remove the mounting screws from the exterior flange of the water heater.
Carefully slide the old unit out of its bay. It might be heavy!

Step 2: Prepare the Opening for the New Unit

Clean the opening thoroughly. Check for any damage or rot. Some tankless units might require a slightly different size opening than your old tanked unit. You may need to build a small frame or use an adapter kit to ensure a snug and secure fit. Seal any gaps with appropriate sealant to prevent water intrusion.

Step 3: Install the New Tankless Water Heater

Carefully slide the new tankless unit into the prepared opening.
Secure it in place using the manufacturer’s recommended mounting screws. Ensure it is flush and well-supported.
Connect the water lines. Apply pipe thread sealant or Teflon tape to fittings to prevent leaks. Connect cold water to the inlet and hot water to the outlet.
Connect the propane line. Use a new flare fitting if necessary. Ensure all connections are tight.
Connect the 12V electrical wiring according to the manufacturer’s diagram. This usually involves connecting to an existing 12V circuit that was used by the old water heater.

Step 4: Test for Leaks and Functionality

With all connections made, turn your RV’s 12V power back on.
Turn on your RV’s water pump or connect to city water. Open a hot water faucet inside the RV to purge air from the lines.
Carefully inspect all water connections for leaks. Tighten any dripping fittings.
Slowly turn on the main propane valve at the tank.
Spray propane leak detector solution on all propane connections (new and old). Look for bubbles, which indicate a leak. If you find a leak, shut off the propane immediately and re-tighten the connection. Retest.
Once confident there are no leaks, turn on a hot water faucet inside the RV. The tankless unit should ignite and begin heating water.
Check the temperature and flow. Adjust settings as needed according to the manufacturer’s instructions.

If you encounter any difficulties or feel unsure at any point, do not hesitate to seek help from a qualified RV technician. Safety is paramount!

Post-Installation: Testing and Care Guide for Your New System

Your new tankless water heater is installed, but the job isn’t quite done. Proper testing and ongoing care ensure years of reliable performance.

Initial Testing and Adjustments

After the initial leak checks and ignition, spend some time testing the unit under various conditions. Run hot water from different faucets. Does it maintain temperature? Does it cycle on and off correctly? Most tankless units have temperature controls; adjust these to your desired comfort level. Pay attention to the flow rate – if you run water too slowly, some units may struggle to ignite or maintain temperature.

Regular Maintenance and Replace RV Water Heater with Tankless Care Guide

Tankless water heaters, while generally low maintenance, do require some attention to keep them running efficiently.

Descaling: Over time, mineral deposits (scale) can build up inside the heat exchanger, reducing efficiency. Periodically descaling with a vinegar solution or a commercial descaling kit is crucial, especially if you use hard water. Follow your manufacturer’s recommendations for frequency.
Ventilation Check: Ensure the exhaust vent is clear of obstructions (insects, debris) before each trip.
Propane System Check: Regularly inspect propane lines and connections for any signs of wear or leaks.
Freeze Protection: If your unit doesn’t have automatic freeze protection, or if you’re storing your RV in freezing temperatures, you’ll need to winterize the unit by draining it completely.

Troubleshooting Common Problems with Replace RV Water Heater with Tankless Systems

Even with careful installation, issues can arise. Knowing how to troubleshoot common problems can save you time and frustration.

No Hot Water or Intermittent Heating

Check Propane: Is your propane tank full and the valve open?
Ignition Failure: Listen for the igniter clicking. If it’s not clicking, check the 12V power supply to the unit and ensure connections are secure.
Water Flow: Is your water pump on, or is city water connected? Is the flow rate sufficient? Low water pressure or a partially closed valve can prevent the unit from firing.
Air in Lines: Bleed air from the hot water lines by opening faucets.
Blocked Vent: Ensure the exhaust vent is clear.

Low Water Pressure

If your overall RV water pressure is low, the tankless unit might not be the cause. Check your water pump, city water connection, and any inline filters. If only the hot water pressure is low, check for kinks in the hot water line or scale buildup in the unit (requires descaling).

Error Codes

Many modern tankless units have digital displays that show error codes. Consult your owner’s manual for a comprehensive list of codes and their corresponding troubleshooting steps. This is often the quickest way to diagnose a problem.

Always prioritize safety. If you suspect a propane leak or an electrical issue you can’t resolve, contact a certified RV technician immediately.

Frequently Asked Questions About Replacing an RV Water Heater with Tankless

Can I install a tankless RV water heater myself?

Yes, many DIYers with basic mechanical and plumbing skills can perform this upgrade. However, it involves working with propane and electricity, so safety precautions are paramount. If you’re uncomfortable at any stage, hiring a professional is always recommended.

How much does it cost to replace an RV water heater with tankless?

The cost varies significantly based on the tankless unit you choose (typically $500 – $1500 for the unit itself) and whether you DIY or hire a professional for installation (which can add several hundred dollars). Factor in any adapter kits or new fittings needed.

Do tankless RV water heaters use more propane?

No, generally they use less propane overall. While they use propane at a higher rate when actively heating, they only heat water on demand, eliminating the standby energy loss of traditional tank heaters. This results in greater efficiency and propane savings over time.

What are the downsides of a tankless RV water heater?

Potential downsides include a higher upfront cost, a minimum flow rate requirement (which can be an issue with very low water pressure), and a slight delay before hot water reaches the faucet. Some units may also struggle in extremely cold incoming water temperatures without a higher BTU rating.

How long do tankless RV water heaters last?

With proper installation and regular maintenance, tankless RV water heaters can last 10-20 years, often longer than traditional tanked units, which typically last 6-10 years.

Conclusion: Embrace the Freedom of Endless Hot Water

Upgrading to a tankless RV water heater is a significant step toward a more comfortable, efficient, and self-sufficient RV lifestyle. Say goodbye to rushed showers and hello to the luxury of on-demand hot water, whether you’re parked at a bustling campground or boondocking deep in the wilderness.

By understanding the benefits, choosing the right unit, and following our detailed guide for how to replace RV water heater with tankless, you’re well on your way to enhancing your outdoor adventures. Remember to prioritize safety, take your time, and don’t hesitate to seek professional help if needed.

With this upgrade, you’re not just replacing a piece of equipment; you’re investing in greater comfort and freedom on the open road. Explore confidently, stay comfortable, and enjoy every moment of your journey!

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Eric James

Hi, I'm Eric James. I grew up in the mountains of Colorado and have been an outdoors enthusiast since I was a young boy. I love skiing, hiking, camping, and fishing, and believe that nature has a way of calming the soul and renewing the spirit. I created "outwardlab.com" to share my passion and help others enjoy the outdoors. I also cover prepping and emergency readiness to ensure that people are prepared for anything. Join me on my journey to explore and be ready for the great outdoors!