Not too long ago, it wasn’t uncommon to hear people insisting that camping wasn’t about comfort. The point was to unplug, unwind, and connect with nature. Now? RVs are just as likely to sport Wi-Fi extenders and outdoor TVs as they are an awning or bike rack. But when it comes to hot water, easy access for showers and cleaning feels more like a necessity than a luxury. Let’s face it: few folks are willing to spend their hard-earned vacation starting every day with an icy blast.
The standard RV water heater, however, holds just 6 gallons, giving you about 5–10 minutes of warm water before things turn chilly.
It’s no wonder then that tankless RV water heaters—which promise continuous, on-demand hot water—have been gaining traction in recent years. But is the potential for longer, hotter showers reason enough to make the upgrade? Let’s dive into the benefits and drawbacks of tankless water heaters, see how they stack up against traditional models, and help you decide if they’re the right fit for your RV lifestyle.
What is a Tankless RV Water Heater?
Unlike a traditional RV water heater that heats up a set amount of water in its tank, a tankless design heats the water as it flows through the unit. This means you’re not limited by what’s in the tank—you get a continuous stream of hot water whenever you need it. Additionally, a tankless heater only activates when you turn on the hot water, so it uses less energy than a traditional tank which cycles on and off to keep the stored water hot (even when you’re not using it).
Tankless vs. Traditional RV Water Heaters
Energy Use
One of the biggest differences between tankless and traditional RV water heaters is their energy efficiency. As noted earlier, traditional tank models regularly cycle on and off to keep the tank of water hot, using energy even when you’re not using water. This constant heating can lead to higher propane or electric consumption over time.
Tankless water heaters only heat the water when you need it, activating only when you turn on the hot water tap. This on-demand heating significantly reduces energy waste, making tankless systems a more energy-efficient choice in the long run.
Hot Water Supply
Traditional tank models shine in one very key area: immediacy. With a tank heater, once the water is heated up, you have hot water ready to go, and the system can provide a consistent temperature for as long as the tank holds up. The frustration, of course, is that tank is limited by size—once it runs out, you’ll need to wait for it to reheat, which can take anywhere from 20 minutes to an hour.
Tankless systems shine in the opposite area: duration. Because they heat water on demand, tankless units provide a continuous stream of hot water for as long as you need it. However, there’s a catch—tankless heaters require a minimum water flow rate to activate, and if the flow is too low, they won’t turn on. Plus, there’s a slight delay as the system heats the water, meaning the first 15-20 seconds of that shower won’t be as hot as with a traditional tank system.
Temperature Consistency
While traditional tank systems offer a consistent temperature for the duration of the hot water supply, tankless systems can experience some variability. Since the water is heated on-demand as it flows through the unit, the initial flow of water can feel cold until the system kicks in. After that, the temperature should stabilize, but it's important to note that flow rate plays a key role in how hot the water gets.
For tankless systems, a slower water flow allows more time for the heater to warm the water, but if the flow is too slow, the unit may not activate at all. The system requires a minimum flow rate to start heating, and in situations with low water pressure or only a small amount of water needed, you might be left waiting for the system to engage. Additionally, if the incoming water is very cold, it can affect the output temperature. To get around this, many owners simply adjust by using only the hot water handle when showering or cleaning to ensure the temperature reaches what is set on the control panel.
Installation & Maintenance
Traditional tank heaters are typically easy to install, with a straightforward setup that usually doesn’t require professional assistance. Tankless water heaters, however, can be more involved, requiring specific venting and gas line adjustments. Professional installation is generally recommended, especially if you’re switching from a traditional tank system. That said, manufacturers are designing models that simplify the installation process.
In terms of maintenance, traditional tank models require more frequent upkeep due to sediment buildup and the occasional need to flush the tank. Tankless heaters typically require less maintenance but can still need occasional descaling, especially if you’re camping in areas with hard water.
Price
When it comes to upfront costs, tankless water heaters typically have a higher price tag than traditional tank models. However, the initial investment is often offset by long-term savings on energy bills and a longer lifespan.
Pros & Cons of Tankless RV Water Heaters
Tankless water heaters offer many advantages, but they also come with some trade-offs. Here’s a breakdown of the main pros and cons to help you determine whether this system is the best fit for your RV lifestyle.
Pros
- Continuous Hot Water: Enjoy longer, hotter showers!
- Space-Saving Design: Compact and lightweight, freeing up space in your RV.
- Energy-Efficient Use: Only heats water on demand, reducing wasted energy.
- Longer Lifespan: Typically lasts 15-20 years.
- Less Maintenance: Less frequent, although periodic descaling might be necessary.
- Reduced Risk of Leaks: Without a tank, there's less likelihood of leaks or water damage.
Cons
- Higher Upfront Cost: More expensive to purchase and install.
- Installation Complexity: May require professional installation, especially if replacing a traditional tank.
- Flow Rate Sensitivity: Requires a minimum water flow to activate, so low flow may not trigger the unit.
- Temperature Fluctuations: Initial water may be cooler, and temperature can vary with water flow and pressure.
Who Should Consider Tankless RV Water Heaters?
Tankless water heaters are not one-size-fits-all, but for certain RVers, they provide a great solution. Here’s a breakdown of who could benefit most from making the switch.
Best For…
- RVers with Limited Space: The compact, lightweight design of tankless water heaters is perfect for RVs with limited storage, maximizing available space.
- Full-Time RVers: Those living or spending extended periods in their RVs will appreciate the continuous hot water, long-term energy savings, and reduced maintenance requirements of a tankless system.
- Campground Regulars: Tankless water heaters are perfect for those who frequently stay at campgrounds with water and sewer hookups.
- Families or Large Groups: Tankless heaters provide a continuous supply of hot water for all users.
Not Best For…
- RVers without Access to Propane: Electric models are not typically compatible with standard RV power setups.
- Short-Term or Weekend RVers: A traditional tank heater may be sufficient for occasional camping.
It’s a Tough Call For…
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Boondockers: While the space and energy benefits are appealing, inconsistent water pressure and flow-rate sensitivity can be frustrating. Additional adjustments and habits may be required to make them work off-grid effectively.
So, Is a Tankless Water Heater Worth It?
Whether a tankless water heater is worth the investment depends largely on your personal RVing habits, budget, and willingness to adapt to a new system. For RVers who can frequently reap the benefits of continuous hot water and energy efficiency, the unit is likely to quickly pay for itself in comfort and convenience. However, if you don’t camp often or aren’t interested in adjusting your water usage habits to accommodate the design, it may not be the right choice for you. That said, as tankless RV water heaters continue to evolve with improved technology, both the price and learning curve are likely to become even more accessible.
Ready to make the switch? Browse quality tankless options from top brands to find the perfect fit for your RV setup!