Tank vs Tankless RV Water Heaters: Pros and Cons

Overview of Tank and Tankless RV Water Heaters

How about we start with the basics? There are two main types of water heaters you'll find in RVs: tank and tankless. Each operates quite differently.

• Tank Water Heaters: Truly the traditional workhorses of the RV world. I've worked on countless tank water heaters, and they store a fixed amount of hot water—typically 6 to 10 gallons—in an insulated tank. The water’s heated and kept at a set temperature, ready for use whenever you turn on the hot water tap. You always have hot water on standby.
• Tankless Water Heaters: Now, these are the new kids on the block, and I've seen their popularity surge in recent years. Tankless heaters, as the name suggests, don't store hot water. Instead, they heat water on demand as it flows through the system. One of my favorite tricks with these systems is showing clients how they provide a continuous stream of hot water without the wait. Talk about high-tech—and their efficiency is making them increasingly popular, too.

Pros and Cons of Tank RV Water Heaters

These trusty units have been around for ages, and for good reason. But, like everything else, they have their upsides and downsides, and I've learned to appreciate both. Let’s talk about the pros:

• Lower Upfront Cost: From my experience, tank water heaters are generally more budget-friendly initially. They’re an attractive option if you're watching your wallet, which, let's be honest, most of us are, especially when kitting out a new RV. I often recommend these to first-time RV owners who want a reliable system without breaking the bank.
• Simple and Familiar Technology: These appliances are pretty straightforward. I've found that most RV owners can even handle basic maintenance themselves. Because the technology is so simple, repairs tend to be less expensive, too. One of my helpful tricks for extending the life of a tank heater is a simple annual flush, which I always teach my clients how to do.
• Consistent Hot Water: As long as you have hot water in the tank, you'll get a steady stream at a consistent temperature. It's reliable—there's something comforting about that. I've spent many evenings enjoying a hot shower thanks to a well-maintained tank heater.

But what about the cons of tank RV water heaters? Keep them in mind:

• Limited Hot Water Supply: Here's the big drawback: once the hot water in the tank is gone, you have to wait for it to reheat. I've learned this the hard way on chilly mornings when everyone in the RV wants a hot shower. It can be a real bummer if you’re accommodating multiple people—or enjoy long showers.
• Reheating Time: It can take a while for a tank water heater to reheat a full tank of water, especially if it's a larger one. I've spent many an hour waiting for the water to heat back up, which is why I always emphasize the importance of planning your hot water usage with tank systems. It takes patience.
• Less Energy-Efficient: Tank heaters continuously heat water to maintain the set temperature, even when you're not using it. So, they consume more energy, which can be a concern if you're boondocking or trying to be eco-conscious. I've seen firsthand how this can impact propane usage, especially on longer trips.
• Larger and Heavier: Tank water heaters take up valuable space in your RV and add to the overall weight. I always remind clients to consider this when planning their RV layout, especially in smaller rigs where space is at a premium. It's all about priorities.

Pros and Cons of Tankless RV Water Heaters

Okay, let's talk about the sleek, modern alternative: tankless water heaters. I've become a big fan of these units, but they're not perfect for everyone—I'll be honest about that. Some of the pros of these appliances include:

• Unlimited Hot Water: The biggest benefit, by far. With a tankless system, you can enjoy endless hot water, as long as you have a water source and power. I've installed these in many RVs, and the owners always rave about the luxury of long, hot showers without worrying about running out.
• More Energy-Efficient: Tankless heaters only heat water when you need it, making them significantly more energy-efficient than tank models. I've seen this translate to real savings on propane or electricity bills, especially for full-time RVers. It's a win for your wallet and the environment.
• Compact and Lightweight: They’re typically much smaller and lighter than tank heaters, freeing up valuable space in your RV. Camping World even notes that their compact size allows for more mounting options—that’s great in my book. I often recommend tankless systems to clients who are trying to maximize storage or reduce the weight of their rig. Every inch counts in an RV.

Tankless water heaters have their drawbacks, too. It all depends on your unique situation, though:

• Higher Upfront Cost: Tankless water heaters typically have a higher initial cost than tank models. However, I always encourage clients to consider the long-term savings on energy bills, which can often offset the higher upfront investment. It's a trade-off.
• Requires Adequate Water Pressure and Power Supply: These systems need sufficient water pressure and a reliable power source to function properly. I've encountered situations where low water pressure or inadequate electrical hookups have caused issues with tankless heaters. It's important to make sure your RV can support these requirements.
• Installation Can Be More Complex: Installing a tankless water heater can be more involved than installing a tank model. While I've mastered the process over the years, I often recommend professional installation to guarantee it's done correctly. This can be very tricky.
• May Have a Delay: Sometimes, there can be a slight delay before hot water reaches the faucet. It's usually just a few seconds, but it's something to be aware of. One of my helpful tricks is to run the water for a moment to get the hot water flowing before stepping into the shower.
  

Key Factors to Consider When Choosing

So, how do you decide which system is right for you? There are some crucial things to consider. I always walk my clients through these factors to help them make the best choice for their individual needs.

• Budget: This is often the starting point for any major RV purchase. Tank water heaters are generally cheaper upfront, while tankless models offer long-term savings on energy. I always advise clients to weigh the initial cost against potential future savings.
• Water Usage: Think about how much hot water you typically use. If you enjoy long showers or have multiple people using hot water simultaneously, a tankless system might be worth the investment. I always ask clients about their shower habits and dishwashing routines to gauge their needs. It makes a difference.
• Space and Weight: Consider the available space in your RV and the overall weight capacity. Tank heaters are bulkier and heavier, while tankless units are more compact and lightweight. I've helped many clients optimize their RV layouts, and choosing the right water heater is a key part of that process.
• Energy Source: Make sure the water heater you choose is compatible with your RV's energy system, whether it's propane, electric, or a hybrid system. I've seen instances where incompatible systems have caused major headaches. Don't let that be you.
• Maintenance and Lifespan: Both types of water heaters require regular maintenance, but tankless systems may need more specialized care. I always emphasize the importance of proper maintenance for both types, but especially for tankless heaters, which can be more sensitive to hard water.
• Climate: If you are often using your RV in extremely cold climates, consider that it will take more energy to heat the water. A tankless system may not be the best choice if you are frequently camping in freezing temperatures. They can struggle in extreme cold.

Installation and Maintenance Tips

Whether you go with a tank or tankless system, proper installation and maintenance are essential for optimal performance and longevity. I can't stress this enough.

• Installation: While some RV owners may be comfortable installing a tank water heater themselves, I generally recommend professional installation for both types, especially tankless systems. Unless you understand proper venting and how to work with gas lines (if applicable) or electrical connections, leave installation to the pros.
• Regular Maintenance: For tank heaters, this includes draining and flushing the tank annually to remove sediment buildup. For tankless systems, it's important to check for leaks, clean the filter, and descale the unit periodically—especially if you have hard water. Check for leaks on both types.
• Professional Inspection: I recommend having a qualified RV technician inspect your water heater at least once a year. They can identify potential issues and ensure your system is operating safely and efficiently, saving you a lot of trouble—and discomfort—down the road.

Conclusion

The choice between a tank and tankless RV water heater is important—it directly impacts your comfort and enjoyment on the road. I've seen firsthand how the right choice can make a world of difference. Both types have their pros and cons, and the best option for you depends on your specific needs and priorities. Do your research and weigh the options—and don't hesitate to consult with a pro if you need any help at all. Happy travels! 

Source

• https://blog.campingworld.com/learn-to-rv/how-do-rv-water-heaters-work/