7 Best RV Water Heaters for Reliable Hot Water

A cold shower in an RV is not a small inconvenience when you are parked for work, traveling with family, or set up miles from the nearest campground office. The best RV water heaters are the ones that match your rig’s hookups, your daily hot-water demand, and the way you actually travel. A unit that works well for a couple taking weekend trips may fall short for a full-time RVer with back-to-back showers.

The right replacement also has to fit. Tank size, exterior door opening, gas connection, electrical supply, venting, and plumbing location all matter. Before ordering a water heater because it looks similar to the old one, verify the model number and installation dimensions. That step can save a return trip, a cabinet modification, or a heater that cannot be safely installed.

The Best RV Water Heaters by Use Case

There is no single best choice for every RV. These dependable options cover the most common needs, from straightforward tank replacements to high-demand tankless systems.

1. Suburban SW6DE - Best all-around 6-gallon replacement

The Suburban SW6DE is a familiar choice in many travel trailers, fifth wheels, and motorhomes. It uses a 6-gallon tank and can heat water with propane or 120-volt electric power. That dual-fuel setup is useful: run propane when boondocking, use electric when campground power is included in your site fee, or use both when you need a faster recovery time.

For many RV owners, a 6-gallon tank provides enough hot water for dishes and one reasonable shower. It is also a practical choice when replacing an existing Suburban unit with the same fitment. The trade-off is recovery time. If several people shower one after another, someone may need to wait for the tank to reheat.

2. Dometic WH-6GEA - Best for a direct tank-style upgrade

The Dometic WH-6GEA is another 6-gallon gas/electric water heater designed for RV use. It suits owners who prefer the predictable operation of a tank heater and want the flexibility of propane and shore power. Tank-style heaters are simple to understand, generally familiar to RV technicians, and often easier to diagnose when a switch, thermostat, heating element, or ignition component fails.

A direct-fit replacement is not always automatic, even when the gallon rating matches. Confirm the rough opening, door style, wiring, and gas-line position before purchase. A 6-gallon replacement should make the job easier, not turn into a remodeling project.

3. Suburban SW10DE - Best for larger crews and longer stays

If your RV has room for a 10-gallon unit, the Suburban SW10DE can be a worthwhile upgrade for families and full-time use. The larger tank gives you more stored hot water before recovery becomes an issue. It is a better fit for a larger fifth wheel, destination trailer, or motorhome where two or more people regularly shower.

The obvious downside is space. A 10-gallon heater is not a drop-in substitute for a 6-gallon opening. It also adds weight and takes longer to heat a full tank. Still, for owners who stay connected to campground power and want fewer arguments about shower timing, the added capacity can be worth it.

4. Girard GSWH-2 - Best tankless option for steady showers

The Girard GSWH-2 is a popular propane tankless RV water heater. Instead of heating and storing six or 10 gallons, it heats water as it flows through the unit. That means you are not waiting for a tank to recover between showers, as long as you have enough water supply, propane, and battery power for the system.

Tankless heaters make the most sense for RVers who want longer showers or have multiple people using hot water during the day. They require a little more attention to setup. Water flow and incoming water temperature affect performance, especially during colder West Texas mornings. If the flow is too low or the temperature setting is too aggressive, you may get temperature swings.

5. Furrion 2.4 GPM Tankless Water Heater - Best for modern replacements

A Furrion 2.4 GPM tankless water heater is a solid option for owners replacing a failed tankless unit or upgrading a newer RV built for one. Its flow-based design can provide continuous hot water without the weight and recovery limitations of a storage tank. Digital controls also make temperature adjustment more straightforward than older manual systems.

That said, gallon-per-minute ratings are not a promise of household-style performance. An RV water pump, restricted faucet aerator, low campground pressure, or very cold inlet water can change the result. Tankless systems work best when the water system is in good condition and the heater is installed to the manufacturer’s requirements.

6. Truma AquaGo Comfort Plus - Best premium tankless system

The Truma AquaGo Comfort Plus is built for RV owners who want premium temperature control and a more refined tankless experience. Its comfort-focused design helps reduce the familiar cold-water burst that can happen when a standard tankless heater cycles on and off. For frequent travelers, it can offer a noticeably better shower experience.

The trade-off is cost and service planning. Premium systems carry a higher upfront price, and parts or authorized service may not be as readily available as common tank heaters in every location. It is a strong choice for an RV owner who values consistent performance and is willing to pay for it, but it is not automatically the most practical replacement for every rig.

7. Atwood-Compatible Replacements - Best when the original unit is discontinued

Many older RVs still have Atwood water heaters. Since original Atwood models are no longer produced, owners often need a compatible Dometic replacement or a carefully planned conversion to another brand. This is where measurements matter most. Door openings, flange dimensions, water-line locations, and control wiring can differ enough to complicate the job.

Do not assume an old Atwood can be replaced with any 6-gallon heater. A compatible unit may need an adapter door or minor changes to complete the installation correctly. Getting the exact model information before ordering is far less expensive than trying to make the wrong heater fit at the campsite.

Tank vs. Tankless: Which One Makes Sense?

A tank heater remains the practical choice for many RV owners. It costs less in many cases, is easier to understand, and works well for normal dishwashing and short showers. If you camp with hookups or use your RV mainly on weekends, a 6-gallon gas/electric model may be all you need.

Tankless makes more sense when hot-water demand is higher and you do not want to schedule showers around a recovery period. It can also free up some weight and space. But tankless units depend on proper propane pressure, steady water flow, adequate 12-volt power, and correct installation. They are not a cure for weak water pressure, an aging pump, or a clogged plumbing system.

For true off-grid use, consider your fuel plan. A dual-fuel tank heater lets you use electric power when connected and preserve propane when it is not needed. A propane tankless system avoids heating a stored tank, but extended showers can use propane quickly. The better option depends on how long you stay off-grid and how much hot water you use.

What to Check Before You Buy

Start with the existing heater’s model number, gallon capacity, and cutout measurements. Measure the exterior opening and check which side the gas, water, and electrical connections use. If your existing heater has both propane and electric operation, do not accidentally replace it with a propane-only model unless that is intentional.

Also inspect the rest of the system. A water heater may not be the only problem if you have weak hot-water flow, lukewarm water, soot around the burner, a leaking pressure-relief valve, or repeated ignition faults. The issue could be a bypass valve left open, failed heating element, bad circuit board, restricted mixing valve, low propane pressure, or mineral buildup in the tank.

Water heaters involve LP gas, combustion, electrical circuits, and hot pressurized water. If there is a gas smell, visible soot, water leaking near electrical components, or a heater that will not ignite properly, shut it down and have it inspected. A fast repair is good. A safe repair is non-negotiable.

Get the Fit and the Repair Right

The best RV water heater is not necessarily the biggest or most expensive model. It is the unit that fits your RV, provides enough hot water for your routine, and can be serviced without creating a new problem. For RV owners in Odessa and across West Texas, Basin RV can help identify the right replacement, source essential parts, and handle mobile repair when a water heater failure interrupts your trip. Bring your model number, measurements, and a clear description of the symptoms, and you will be much closer to getting hot water back without wasted time or unnecessary parts.