Best RV Tankless Water Heaters for Hot Showers Anywhere

By Jake Morris — RV Gear Expert & Contributing Editor· June 11, 2026· 12 min read

Written by Jake Morris Senior RV Gear Writer at ShopRVGear

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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…

8 yrs experience·Last updated: Jun 11, 2026

Short answer: the best RV tankless water heaters in 2026

If you want reliable hot showers anywhere without babysitting your water heater, look first at RV‑specific propane tankless units: they’re built for 12V systems, rough roads, and won’t cook your plumbing when the flow rate dips.[2][6][9] For most RVers, the sweet spot is a 60,000–65,000 BTU on‑demand propane heater with freeze protection and good temp control.[1][4][6] Electric and 120V portable units have their place, but only if you regularly plug into strong shore power.

Below I’ll walk through the best current models, what each is actually good at, what to avoid, and how to size and install one so you’re not stuck with lukewarm dribbles or scalding surprises.

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Best RV tankless water heaters: quick picks

Specific model availability and specs can change. Always confirm dimensions, fuel type, BTU rating, and venting requirements before buying.

Based on recent buyer’s guides, spec sheets, and owner feedback, these categories reflect what’s working for RVers now.[2][6][7][9][10]

1. Best overall RV tankless water heater (most rigs)
   Larger 60,000–65,000 BTU RV‑specific propane tankless unit with freeze protection and good temp control (e.g., Furrion‑style 2.4–2.9 GPM class)[1][4][6][9]

   

2. Best budget upgrade from a 6–10 gallon tank
   Mid‑range RV propane tankless (~42,000–50,000 BTU, 2.0–2.2 GPM) that reuses your existing cutout and basic propane lines.[2][6][7]

3. Best for boondockers who hate babysitting temps
   RV propane tankless with advanced temperature stabilization / “Vortex”‑type mixing system to handle pressure swings when toilets and faucets join the party.[1][4][9]

4. Best electric option (hookups only)
   Compact 120V/240V electric tankless or hybrid unit usable only on strong shore power or large inverter/solar setups.[2][5][6]

5. Best for small campers & vans
   Portable outdoor propane tankless shower unit with integrated pump (or compatible with a 12V pump) for off‑grid rinses and gear washing.[5][6][7]

In the sections below, I’ll refer to these categories instead of pushing one specific brand, because branding shifts but the requirements for reliable RV hot water don’t.

1. Best overall: 60,000–65,000 BTU RV propane tankless (2.4–2.9 GPM)

If you want true home‑like hot water and you camp in a mix of hookups and boondocking, a high‑output RV‑specific propane tankless is where to start.[1][2][6] Many of the best‑reviewed models sit around 60,000–65,000 BTU with 2.4–2.9 GPM rated flow and are designed to drop into common 6–10 gallon RV water heater openings.[1][4][6]

Why this class is the best pick

• Enough BTUs for real showers even with cold inlet water, assuming you’re not trying to run two long hot showers at once.[1][2]
• RV‑specific design: 12V controls, low‑pressure ignition, and vents suited to RV walls instead of house chimneys.[2][6][9]
• Better temperature stability than portable or ultra‑cheap models; many use recirculation or mixing (“Vortex”‑type) tech to smooth out temp spikes when flow changes.[1][4][9]
• Direct replacement kits: trim rings and mounting hardware often fit standard Suburban/Atwood style cutouts, making upgrade easier.[6][9]

Pros

• Unlimited hot water while propane and water last.[2][3]
• Fast recovery: no waiting for a tank to reheat.[2]
• Compatible with 12V RV systems and onboard propane.
• Frequently include freeze protection and diagnostics.[6][9]
• Great balance of comfort vs. propane use.

Cons

• Higher up‑front price than basic tank models.[2][6]
• Requires correct venting and sealing in RV walls.[6][9]
• Can still “cold sandwich” (brief hot‑cold‑hot) if sized or plumbed poorly.[2][9]
• Installation may be DIY‑unfriendly if you’re not comfortable with gas and 12V.[6]

Best for

• Families or couples who shower in the RV often.
• Four‑season travelers who need freeze protection.
• Folks upgrading from a 6 or 10 gallon tank who want a long‑term solution, not a stopgap.

2. Best budget upgrade: mid‑range RV tankless (≈42,000–50,000 BTU)

If your rig is smaller or you mostly travel in milder temps, a mid‑range RV‑specific propane tankless is often enough.[2][6][7]

These typically offer ~42,000–50,000 BTU and around 2.0–2.2 GPM, which is fine for one shower at a time plus maybe a trickle at the sink.

Why these are solid value

• Often priced lower than the 60k–65k BTU heavyweights.[6][7]
• Still designed for RV cutouts and propane systems.[6]
• Plenty for solo travelers or couples who aren’t running back‑to‑back marathon showers.[2]

Pros

• More affordable while still getting tankless convenience.[6][7]
• Easier to feed with limited water supply (smaller GPM).[2]
• Lower propane burn than high‑output units under similar use.

Cons

• Can struggle with cold inlet water (mountain camps, winter shoulder seasons) if you demand high flow.[1][2]
• Less headroom if someone opens a second tap mid‑shower.
• Sometimes fewer advanced features (simpler control panels, less robust freeze protection).[6]

Best for

• Weekend warriors and fair‑weather campers.
• Smaller travel trailers and Class B/C rigs.
• Budget‑conscious upgrades from 6‑gallon tanks.

3. Best for boondocking: propane tankless with advanced temp control

Boondocking exposes the weak spots in cheap tankless heaters: inconsistent water pressure, fluctuating temperatures, and lower 12V power at times.[2][3][9]

Some RV‑specific propane tankless heaters now include advanced temperature stabilization systems (often marketed as “Vortex” or similar), which actively mix or modulate to maintain a stable outlet temp when flow and inlet temp change.[1][4][9]

Why these are worth it off‑grid

• Better control at low flow: they can stay lit without demanding a huge flow rate.[2][6]
• More consistent outlet temp when a toilet flush or another faucet changes pressure.[1][4]
• Designed for 12V DC and propane, which is what you actually have in the boonies.[2][6]

Pros

• Fewer scalding or freezing surprises in the shower.[1][4][9]
• Typically include freeze protection, helpful when overnight temps drop.[6]
• Often have diagnostic codes that make field troubleshooting easier.[9]

Cons

• Normally in the upper price tier of RV heaters.[2][6]
• More electronics = more to go wrong if power supply is marginal.
• Still dependent on good propane and 12V supply; weak batteries cause misfires.[2][9]

Best for

• Full‑timers who boondock often.
• Mountain and shoulder‑season campers.
• Anyone tired of adjusting the shower every 10 seconds.

4. Best electric RV tankless heaters (for strong hookups only)

Electric tankless sounds appealing—no propane, no exhaust—but the reality is harsh: true whole‑RV tankless units need a lot of power.[2][5][6]

Residential electric tankless units can draw 8–30 kW, far beyond what a typical 30A RV service can supply.[2][5] For RV use, you’re usually limited to smaller 120V or 240V units, or hybrid/tank‑assist designs that pre‑heat water rather than doing it all on demand.[5][6]

When electric makes sense

• You almost always have 50A hookups or a stout inverter/solar system.
• You want to reduce propane use and don’t mind limiting flow.
• You’re okay with electric handling one shower or a sink, not everything at once.

Pros

• No propane plumbing or combustion exhaust to manage.[5]
• Can pair well with large solar + lithium setups for light use.[5]
• Often compact and simpler to winterize.

Cons

• Huge power draw; can easily trip a 30A pedestal if not sized carefully.[2][5]
• Many are not RV‑rated—they need careful installation and protection from vibration.[5][6]
• Not practical for most boondockers.

Best for

• Park‑model setups or full‑timers who stay mostly in parks with 50A power.
• Rigs with oversized electrical systems.
• People who strongly prefer electric over propane and understand the tradeoffs.

5. Best for vans and small campers: portable propane tankless showers

For vans, pop‑ups, truck campers, and minimalist rigs, a portable outdoor propane tankless shower can be perfect.[5][6][7]

These units typically hang outdoors, connect to a small propane bottle and a hose, and either include a small pump or rely on your existing 12V pump and water source.[5][6]

Why these work well for small rigs

• No need to cut the RV wall or run permanent venting.
• Can be used for outdoor showers, rinsing gear, dogs, and dishes.
• Easy to move between rigs or store when not in use.[5][7]

Pros

• Lowest cost entry into on‑demand hot water.[6][7]
• Flexible: not tied to a single RV’s cutout.
• Nice backup even if you also have a built‑in heater.

Cons

• Outdoor use only for safety; not designed for wall‑mount indoor RV use.[5][6]
• Less refined temp control and fewer safety features than RV‑specific units.
• Must store dry and protected when traveling.

Best for

• Vanlifers and overlanders.
• Tent‑campers who want a basic hot shower solution.
• RVers who mostly use campground showers, but want a backup.

Key buying factors: how to pick the right RV tankless water heater

Once you know which type fits your camping style, narrow it down using these practical criteria.[2][5][6][9]

1. Fuel type: propane vs electric

• Propane tankless (most common in RVs)

  • Pros: Works off‑grid, high BTU in a small package, designed for RV use.[2][6][9]
  • Cons: Requires safe gas plumbing, venting, and combustion air.

• Electric tankless

  • Pros: No combustion gases; simpler to install in some cases.[5]
  • Cons: Needs very strong shore power or large inverter; not boondocker‑friendly.[2][5]

For most RVers, propane is the practical choice.

2. BTU rating and GPM

• A minimum of ~60,000–65,000 BTU is recommended for stable temps in varying inlet conditions, especially cold water.[1]
• Smaller rigs or warm‑weather use can get by with ~40,000–50,000 BTU.[2][6]
• Check GPM (gallons per minute): most RVers need 1.5–2.5 GPM for comfortable single‑shower use.

If you routinely camp where water is cold (mountain states, shoulder seasons), err on the higher BTU side.[1][2]

3. RV compatibility: cutout, depth, and venting

• Measure your existing water heater frame opening and depth.
• Confirm the new unit’s cutout dimensions and whether it includes a trim kit.[6][9]
• Make sure the venting direction (sidewall vs roof) matches your rig’s layout.

Many modern RV tankless heaters are designed as drop‑in replacements for common Suburban/Atwood sizes, but you still need to verify before cutting fiberglass.

4. Temperature control and minimum flow

Two specs matter a lot in real‑world use:[2][6][9]

• Temp control method: simple high/low flame vs. modulating burner plus sensors. More sophisticated control means fewer temp swings.
• Minimum activation flow: if the heater needs a lot of flow to turn on, you’ll get cold bursts when you try to take a low‑flow RV shower.

Look for RV‑specific units with modulating burners and a low minimum flow spec.

5. Power, electronics, and freeze protection

• Propane tankless units need 12V power for ignition and control boards.
• Many better units include built‑in freeze protection, using electric elements to keep internals above freezing down to a specified temperature.[6]

If you camp below freezing, pay attention to freeze protection specs and where the unit and plumbing are located.

6. Serviceability and support

• Check that the brand offers exploded parts diagrams and replacement parts.
• Look for error code lists and documentation—these save you headaches in the field.[9]
• Scan recent owner reviews for customer service experiences, not just first‑week impressions.[2][6][9]

Real‑world pros and cons of going tankless in an RV

Beyond the marketing, here’s what actually changes when you switch from a traditional RV tank water heater to a tankless.[2][3][6][9]

Big benefits

• Unlimited hot water (within reason) for long showers, kids, and laundry.[2][3]
• Faster recovery—no waiting 20–30 minutes between showers.[2]
• Less standby loss: you’re not constantly reheating a tank, which can save propane.[2][5]
• Space and weight savings in some installs.

Tradeoffs and annoyances

• Water temp depends on flow: if someone opens a faucet, your shower changes.
• You may need to change your shower habits: moderate, steady flow tends to work best.[2][3]
• They’re more complex than simple tank heaters—more parts that can fail.[6][9]
• Boondockers must balance water use vs comfortable flow; ultra‑low flow can cause burner cycling.

If you understand these quirks going in, you’ll be much happier with your upgrade.

What to skip (and why)

Based on expert reviews and owner reports, here’s what tends to cause regret.[2][3][6][7][9]

1. Generic household tankless units shoved into RVs

   • Not designed for vibration, 12V systems, or RV venting requirements.
   • Can overload your electrical system or fail early from road abuse.

2. Ultra‑cheap unbranded propane heaters

   • Frequently lack proper certifications and safety features.
   • Poor temp control and limited support or spare parts.

3. Electric tankless on 30A service without careful load planning

   • Very easy to trip breakers when you run AC + microwave + water heater.
   • Often end up being run at low power, which means lukewarm water.

4. Units without clear documentation or RV‑specific instructions

   • If the manual doesn’t show RV installs or list clear error codes, you become the test pilot.

Spending a bit more on an RV‑specific, supported model usually costs less than replacing a cheap unit and repairing water damage.

Installation and safety: what to know before you DIY

Swapping a tank for tankless looks straightforward, but you’re dealing with propane, 120V/12V electricity, and water in tight spaces. Take it seriously.[5][6][9]

When DIY might be reasonable

• You’re replacing an existing RV water heater with a direct‑replacement RV tankless unit.
• You’re comfortable with basic 12V wiring, crimping, and leak checks.
• You follow the manufacturer’s manual line by line, including sealants and clearances.

When to hire a pro

• Any time you’re moving gas lines or altering venting paths.
• You’re unsure about combustion air and exhaust safety.
• Your RV is under warranty and the manufacturer requires professional install.

Regardless of who installs it:

• Test for propane leaks with an approved leak‑detection method.
• Verify proper venting and clearances from windows and doors.
• Confirm breaker/fuse sizing and wire gauge per the manual.

Usage tips: how to get stable hot showers from a tankless RV heater

A good unit plus good habits equals reliable hot water.[2][3][6][9]

• Start with a fixed temp at the heater (e.g., 105–115°F) and use only the hot side in the shower. Mixing hot and cold at the faucet often confuses tankless units.
• Run a steady, moderate flow—don’t crank it wide open, then throttle to a trickle.
• If boondocking, use a low‑flow shower head (1.5–2.0 GPM) that still maintains enough flow to keep the burner lit.
• Periodically descale if you camp in hard‑water areas, per the manufacturer’s schedule.[5][9]
• Before winter, winterize or use the built‑in freeze protection as directed.

These small adjustments often make the difference between “meh” and “this feels like home.”

Frequently Asked Questions

How many BTUs do I really need for an RV tankless water heater?

Most experts recommend around 60,000–65,000 BTU for stable outlet temperatures under varying inlet conditions, especially if you camp where water is cold.[1][2][6] Smaller rigs in warm climates can sometimes get away with ~40,000–50,000 BTU, but you’ll have less margin for multiple fixtures and cold‑water inlets.[2][6]

Is a gas or electric tankless water heater better for an RV?

For most RVers, a propane tankless heater is the better choice, because it provides high BTU output from a compact unit and works well off‑grid with 12V power.[2][5][6][9] Electric tankless heaters are only practical if you consistently have strong shore power (preferably 50A) or a robust inverter/solar setup; otherwise they draw too much power for typical RV electrical systems.[2][5]

Can I run an RV tankless water heater on solar?

You can indirectly run a propane RV tankless on solar, since it only needs 12V power for controls and ignition; your solar and batteries just need to support that modest draw.[2][5][6] Purely electric tankless units, however, require so much power that running them from solar alone is generally unrealistic for most RV installations.[2][5]

Will a tankless water heater save propane in my RV?

A tankless water heater can reduce standby losses because it only heats water on demand, instead of maintaining a full tank at temperature.[2][5] That said, many RVers take longer showers once they have unlimited hot water, which can offset some of the fuel savings, so real‑world propane use depends on your habits.[2]

Can I install a residential tankless heater in my RV?

In general, no—or at least, not safely or practically for most people. Residential tankless units are designed for stationary homes, not for vibration, limited ventilation options, and 12V systems in RVs, and they often draw more power or need different venting than an RV can safely provide.[5][6][9] It’s far safer and easier to choose an RV‑specific tankless model that explicitly supports mobile installation.

All Picks & Comparison

#		Product	Price	Rating
#1		KINGRVER KINGRVER XT65 Tankless RV Water Heater, 3.8 GPM On-Demand Hot Water, Propane Gas Powered, 12V DC, Wired Remote Controller, High-Altitude Ready, Designed for RV Travel & Family Use	$319.99	★★★★☆ (268)	View on Amazon
#2		RV Tankless Water Heater - Endless Hot Water for Camping & High Altitude, 12V DC Propane Gas, High Altitude Ready (9,800ft), CSA Certified with Digital Display for Travel Trailers True White	$256.49	★★★★★ (32)	View on Amazon
#3		ORBEK RV Tankless Water Heater, Ideal for RV Families & Campers, Propane Gas On-Demand Instant Hot Water Heater, 12V DC, CSA Certified, with Remote Control, Compatible with All RVs	$249.99	★★★★☆ (64)	View on Amazon
#4		APUS RV Tankless Water Heater, 68,000 BTU Propane Gas On Demand Hot Water with White Door&Remote, 12V, 3.9 GPM, High Altitude Ready, CSA Certified, Compatible with All RVs,Ideal for RV Family & Camper	$299.99	★★★★☆ (101)	View on Amazon
#5		RV Tankless Water Heater, 65000BTU Dual-Outlet Lockable Instant Camper Hot Water Heater with Controller, 12V Propane Saving Shower for Full Time RV, Off-Grid, High Altitude, 15x15 Inch Door	$249.99	★★★★★ (13)	View on Amazon