The best electric tankless water heater for RVs balances power, flow, and fit.
You wake up at a campsite, the air is crisp, and you just want a hot, steady shower. But in many RVs, hot water runs out fast or fluctuates. That’s where the best electric tankless water heater for RV changes life on the road. It heats on demand, saves space, and stops you from scheduling showers around a tiny tank. In this guide, I’ll help you choose a model that matches your rig’s power, plumbing, and climate. I’ll also call out where electric shines and where RV-ready propane units make more sense. My goal: simple, expert advice you can use today.
Rheem 18kW 240V Electric Tankless Heater
The Rheem 18kW 240V is a strong electric tankless option for larger rigs or park models with 240V service. It delivers steady hot water and can handle a shower and a low-flow sink at once in mild climates. The digital control keeps outlet temperature steady, which helps in tight RV plumbing runs. It is compact and wall-mountable, saving precious storage space.
Power is the catch. This unit needs 240V and a high-amp circuit that most RV panels lack. It is best for fifth wheels or motorhomes with 50A/240V hookups or permanent setups. If your RV runs only on 120V, skip it. If you do have 240V and a robust panel, the Rheem offers a smooth, quiet, on-demand experience with proven reliability.
Pros:
- Strong hot water output for an electric unit
- Stable temperature control prevents scalds and cold spikes
- Compact, wall-mount design saves RV storage space
- Low maintenance with no anode rod to replace
- Durable build from a trusted brand with wide support
Cons:
- Requires 240V and high amperage most RVs lack
- Performance drops in very cold inlet water
- Professional install often needed for code compliance
My Recommendation
If your RV has 240V service and you want clean, electric hot water, this is a top pick. It can be the best electric tankless water heater for RV owners who park long-term or upgrade panels. It shines for full-time travelers in warm or moderate climates. It also works well for park models where 240V is standard.
| Best for | Why |
|---|---|
| Parked or seasonal rigs with 240V | Plenty of power for steady hot water |
| Full-time RVers in mild climates | Stable temps and decent flow with 18kW |
| Upgraders replacing a large tank | Space-saving, efficient, and reliable |
EcoSmart ECO 11 13kW Electric Tankless Heater
The EcoSmart ECO 11 is a compact 13kW 240V unit that fits tight RV spaces. In warm to moderate climates, it can handle a single low-flow shower or a sink. The self-modulating feature helps match power draw to demand, which can steady outlet temperature and save energy. The interface is simple, and the unit is easy to mount.
Like other 240V heaters, it needs the right power. Many RVs only have 120V. If your rig has a 50A, 240V split-phase hookup and room in the panel, this can work. It is not a high-flow beast, so pair it with a 1.5–1.8 GPM RV shower head. For small families or solo travelers, it can be the best electric tankless water heater for RV use in the South or West.
Pros:
- Compact and light, ideal for RV cabinets
- Self-modulating tech for stable temps
- Good for low-flow shower in warm climates
- Clear temperature control dial
- Budget-friendly entry to electric tankless
Cons:
- Needs 240V power many RVs lack
- Limited to one fixture at a time
- Performance drops with cold inlet water
My Recommendation
I like the ECO 11 for small rigs with true 240V service and low-flow fixtures. It is a possible best electric tankless water heater for RV owners in warm regions who shower one at a time. It’s also great for weekenders at parks with solid hookups. If you camp off-grid or in cold places, look at RV propane tankless units instead.
| Best for | Why |
|---|---|
| Solo travelers or couples | One low-flow shower at a time is ideal |
| Warm to moderate climates | Higher inlet temps boost flow |
| Budget-conscious upgrades | Lower cost and simple controls |
FOGATTI InstaShower 9 Pro RV Tankless Heater
This is a propane RV tankless water heater, not electric. I include it because many RVers want true on-demand hot water without huge electrical loads. The FOGATTI InstaShower 9 Pro uses propane for heat, and 12V DC for ignition and controls. It is built for RV cutouts with a 15″ x 15″ door and comes with a remote controller. The built-in mixing tank helps reduce temperature spikes when taps open and close.
With up to 66,000 BTU, it can supply steady showers even in cool weather. Freeze protection and fault codes are RV-friendly touches. If you camp off-grid or run on 30A/120V shore power, propane tankless makes sense. For many rigs, this ends up being the best electric tankless water heater for RV alternatives because it solves the same problem with far less power draw.
Pros:
- RV-specific fit with included exterior door
- High BTU output for stable showers
- Built-in mixing tank reduces temp swings
- Runs on propane and 12V, great off-grid
- Freeze protection and error code diagnostics
Cons:
- Not electric; uses propane for heat
- Professional install recommended for gas safety
- Needs periodic maintenance for scale and venting
My Recommendation
If you dry camp or use 30A service, this is the practical choice. It is not electric, but it replaces an old tank water heater with real on-demand comfort. For many families, it feels like the best electric tankless water heater for RV because it delivers the same instant hot water and space savings without needing 240V. It also plays nice with RV plumbing and weather.
| Best for | Why |
|---|---|
| Off-grid and boondocking | Propane heat, low 12V draw |
| Cold-weather camping | High BTU handles low inlet temps |
| Direct RV replacement | 15″ x 15″ door and RV cutout fit |
3000W 110V Mini Electric Under-Sink Heater
This 3000W 110V under-sink unit is a niche but clever RV solution. It gives quick warm water to a single sink with minimal power draw. If you hate waiting for hot water to reach the galley, this unit can preheat at the point of use. It fits under a cabinet and plumbs to standard RV lines with basic fittings.
Set expectations. At 3000W on 110V, it will not run a proper shower. It is best for hand washing or dish rinsing. It likely needs a 30A dedicated circuit to avoid nuisance trips. If you pair it with a propane tankless for showers, you get a hybrid system. That can feel like the best electric tankless water heater for RV kitchens, especially in small campers or van builds.
Pros:
- Runs on common 110V circuits
- Great point-of-use performance for sinks
- Small, light, and easy to mount
- Cuts water waste waiting for hot flow
- Low cost and simple controls
Cons:
- Not enough power for showers
- Needs a dedicated 30A circuit in many cases
- Flow must be kept low for good heat
My Recommendation
I suggest this for targeted comfort. Use it in the kitchen or bathroom sink to save time and water. Pair it with a propane RV tankless or a 240V electric unit if you have one. As a sink booster, it can be the best electric tankless water heater for RV owners who want quick warm water without a full electrical overhaul.
| Best for | Why |
|---|---|
| Point-of-use at sinks | Instant warm water where you need it |
| Small campers and vans | Runs on 110V and fits tight spaces |
| Hybrid setups | Boosts convenience with propane main heater |
ORBEK 60,000 BTU RV Tankless Water Heater
The ORBEK 60,000 BTU is another RV-focused propane tankless heater. It uses propane for heat and 12V DC for its control board and fan. It is CSA certified and ships with a remote, which makes temperature management easy inside the coach. It is designed to fit common RV water heater cutouts and works as a direct replacement for many older tank units.
Performance is strong for a compact RV system. The output supports a steady shower and light sink use with proper low-flow fixtures. Maintenance is simple if you follow annual descaling in hard water areas. For RVers without 240V, ORBEK stands in for the best electric tankless water heater for RV goals by delivering on-demand comfort with minimal electrical strain.
Pros:
- RV-ready size and exterior door compatibility
- Good BTU output for showers in most climates
- 12V DC operation for controls and ignition
- Remote control for easy temperature setting
- CSA certification for peace of mind
Cons:
- Propane-fueled, not electric
- Requires correct venting and sealing
- Temperature can vary with very low flow
My Recommendation
If you want simple, on-demand hot water without reworking your electrical, this ORBEK is a safe bet. It fits many factory openings and runs well on typical RV power. For many, it’s a practical stand-in for the best electric tankless water heater for RV wants. It balances comfort, efficiency, and install sanity.
| Best for | Why |
|---|---|
| Direct replacements | Fits standard RV cutouts and doors |
| 30A shore power users | Propane heat, low electric draw |
| Families who shower daily | Steady output with RV-friendly controls |
FAQs Of best electric tankless water heater for rv
Can I run an electric tankless heater on 30A RV power?
Usually, no. Most true electric tankless units need 240V and high amps. A 30A RV hookup is 120V. You can use a 110V mini unit for a sink, but not a full shower.
How much flow can I expect from a 13kW or 18kW unit?
In warm climates, a 13kW may run one low-flow shower. An 18kW can do a shower and a sink in mild weather. Cold inlet water lowers flow. Use a 1.5–1.8 GPM shower head.
Is propane better for RV tankless hot water?
Often, yes. Propane RV units offer more heat without huge electric loads. They work on 12V DC for controls and can handle cold water better.
Do I need special plumbing or venting?
Electric units need correct wire and breakers, but no flue. Propane RV units need sealed venting and safe gas connections. Follow RV codes and use pro installers when needed.
Will a mini 110V heater work for showers?
No. A 3000W 110V unit is for sinks only. It is great for warm water at a faucet, not for full-body showers.
Final Verdict: Which Should You Buy?
If you have 240V in your rig, the Rheem 18kW is strong and steady. For small 240V needs, the EcoSmart ECO 11 fits tight spaces and low-flow fixtures.
If you run 30A or camp off-grid, choose FOGATTI or ORBEK. For sink boosts, pick the 3000W mini. Each can help you reach the best electric tankless water heater for rv goal of instant, reliable hot water on the road.
