Tankless vs Tank Water Heater for RV: Full Comparison
Jake has spent 8 years full-timing in a Class A motorhome and has personally tested hundreds of RV products across North America. He is the lead gear reviewer at Shop RV Gear, covering solar setups, backup safety syst…
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We researched and tested the top options, comparing them across key factors including performance, value, ease of use, and reliability. Our recommendations are based on hands-on evaluation and real-world usage data.
Tankless vs Tank Water Heater for RV: Full Comparison
Choosing between an RV tankless vs tank water heater is one of the most important comfort decisions RV owners make. Hot water affects everything from showers and dishwashing to overall campground convenience. While both systems do the same basic job, they work very differently, and the better choice depends on how you travel, how often you camp, and how much hot water you really use.
A traditional RV tank water heater stores a limited amount of hot water, usually in a 6-gallon or 10-gallon tank. A tankless unit heats water on demand as it flows through the system. That sounds simple, but in real-world RV use, each type has advantages and trade-offs involving energy use, recovery time, winterization, maintenance, and upfront cost.
This guide breaks down the key differences so you can choose the right setup for your rig.
RV Tankless vs Tank Water Heater at a Glance
| Feature | RV Tankless Water Heater | RV Tank Water Heater |
|---|---|---|
| Hot water supply | Continuous while demand stays within flow limits | Limited to tank size |
| Upfront cost | Higher | Lower |
| Installation | More complex in many retrofits | Easier replacement in many RVs |
| Energy efficiency | Often better, heats only when needed | Uses energy to maintain stored hot water |
| Water temperature consistency | Can vary with flow rate and inlet temperature | Usually steady until tank runs out |
| Best for | Longer showers, full-time RVing, frequent use | Budget buyers, simple setups, occasional campers |
| Maintenance | Requires descaling and care with sensors/burners | Simpler, but tank and anode maintenance may apply |
| Cold weather performance | May struggle with very cold incoming water | Often more predictable for short-use needs |
How an RV Tank Water Heater Works
A tank water heater stores and heats a set amount of water in advance. In many RVs, that means 6 gallons of hot water ready for use. Once the tank is emptied, you have to wait for recovery before more hot water is available.
The biggest benefit of a tank system is simplicity. These heaters are proven, common, and easier for many owners to understand and maintain. If your RV already has one installed, replacing it with another tank model is often straightforward.
Tank systems are also predictable. The water is heated and stored at a set temperature, so short tasks like handwashing or quick showers are easy to manage. For many weekend campers, that is enough.
The main drawback is capacity. Once the hot water is gone, it is gone until the unit reheats. That can be frustrating for families or anyone who prefers long showers.
How an RV Tankless Water Heater Works
A tankless RV water heater heats water only when you turn on the hot tap. Instead of storing hot water, it uses a burner or heating element to warm water as it passes through the unit.
The major selling point is nearly endless hot water. As long as the heater can keep up with flow demand and fuel supply, you can continue using hot water without waiting for a tank to refill and recover.
That makes tankless models appealing for full-time RVers, larger households, and owners who want a more residential-style shower experience. They can also be more energy efficient because they do not constantly maintain a hot tank.
However, tankless systems can be more sensitive. Water flow rate, inlet water temperature, and propane performance all affect output. In very cold weather, a tankless model may have trouble delivering the same temperature rise without reducing flow.
Cost Comparison
When comparing RV tankless vs tank water heater, budget matters. Tank water heaters usually cost less to buy and replace. They are often the economical choice for owners who want a dependable solution without spending heavily on upgrades.
Tankless models typically have a higher purchase price. If you are retrofitting an older RV, installation can increase total cost further due to venting, plumbing adjustments, door compatibility, or electrical requirements.
That said, some RV owners view tankless units as a value over time because of lower standby energy loss and improved daily comfort. If you camp frequently, the extra cost may feel justified.
Performance and Daily Use
For actual use, the difference is easy to understand:
- A tank heater gives you a limited supply of hot water quickly.
- A tankless heater gives you a longer supply of hot water, but performance depends on conditions.
If you mostly wash dishes, rinse off quickly, and camp on weekends, a tank heater may meet your needs with no issue. If you travel with family, shower often, or live in your RV full time, tankless can be a major upgrade.
Still, tankless is not perfect. Some units require a minimum flow rate to activate. That means very low-flow use, such as lightly opening a faucet, may not trigger heating reliably. Users may also notice a short delay before water turns fully hot.
Installation and Space
Tank water heaters are usually easier to replace because many RVs were built around standard tank dimensions. Swapping one for a similar model often requires fewer modifications.
Tankless installations vary more. Some are designed as direct tank replacements, but others need fitment adjustments. Proper venting and clearances are especially important. If your rig has limited access or unusual cutout sizes, installation can become more involved.
Space can be a plus for tankless designs, but in an RV, real-world fit depends on the exact appliance and existing compartment.
Maintenance and Reliability
Tank heaters are mechanically simple and familiar. Depending on the model, maintenance may include flushing the tank, checking the burner assembly, and replacing the anode rod if used.
Tankless heaters need regular care too, especially descaling in hard-water areas. Because they rely on sensors and tight heat exchange passages, mineral buildup can affect performance more quickly. They also may be less forgiving if water quality is poor.
For reliability, neither type is automatically better. A quality model installed correctly and maintained well matters more than the basic category.
Which One Is Better for Your Camping Style?
Choose a tank RV water heater if:
- You want the lower-cost option
- You camp occasionally or on weekends
- You prefer simpler replacement and maintenance
- Your hot water usage is modest
Choose an RV tankless water heater if:
- You want longer showers
- You travel full time or camp often
- Multiple people use hot water back to back
- You are willing to pay more for convenience and efficiency
Verdict: RV Tankless vs Tank Water Heater
There is no single winner in the RV tankless vs tank water heater debate because the best option depends on your priorities.
If you want affordability, simplicity, and proven performance, a tank water heater is still a smart choice. It suits many RVers, especially weekend campers and owners replacing an existing factory-installed unit.
If you want modern convenience, more continuous hot water, and better efficiency potential, an RV tankless water heater is often the better long-term upgrade. It is especially attractive for full-timers, larger households, and RVers who place a premium on shower comfort.
For most occasional campers, tank systems remain the practical value pick. For frequent travelers who use more hot water every day, tankless usually wins on comfort.
In short: buy a tank heater for simplicity and lower cost; choose tankless for comfort and endless hot water.
Top Picks & Comparison
| # | Product | Price | Rating | ||
|---|---|---|---|---|---|
| #1 |  |
Suburban Advantage RV Tank Water Heater SW6DE - 6 gallon Porcelain Lined Steel Tank with Direct Spark Ignition (DSI) and Incoloy Electric Element (5239A) |
$499.99 | (3,334) | View on Amazon |
| #2 |  |
Gen II Ranein RV Tankless Water Heater 65,000 BTU, On-Demand Instant Hot Water, 12V Powered, High Altitude Ready, CSA Approved, Multi-Function Controller, Ideal for Simultaneous Use and Family Use |
$399.00 | (605) | View on Amazon |
| #3 |  |
Suburban Advantage RV Tank Water Heater SW6D – 6 gallon Porcelain Lined Steel Tank with Direct Spark Ignition (DSI) 5238A |
$449.99 | (998) | View on Amazon |
| #4 |  |
KINGRVER KINGRVER 6 Gallon RV Water Heater with Remote Controller, 12,000 BTU High-Output Burner, Propane & Electric Hybrid Heating, Porcelain-Lined Tank, DSI Ignition |
$439.99 | (15) | View on Amazon |
| #5 |  |
FOGATTI HybridShower 6 Ultra RV Tank Water Heater, Triple-Power Mode (Gas/Electric/Hybrid) for Campground & Boondocking Use, DSI Ignition, 15"x15" Door |
$559.99 | (316) | View on Amazon |