Nothing upgrades RV living quite like reliable, on-demand hot water. Whether you’re full-timing, weekending, or setting up a mobile guest suite, an electric tankless water heater gives you endless hot water without bulky tanks or propane hassles. With so many options on the market, how do you pick the right one for your rig? Here’s your complete, up-to-date guide to the best electric tankless water heaters for RVs—including quick picks, what to look for, in-depth reviews, a handy comparison table, and expert tips for installation and use.
Quick Picks: Best Electric Tankless Water Heaters for RV
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Best Overall:
EcoSmart ECO 11 Electric Tankless Water Heater – Perfect blend of power, size, and reliability for most RVers. -
Best for Large RVs:
Stiebel Eltron Tempra 15 Plus Electric Tankless Water Heater – Handles high flow and multiple fixtures with ease. -
Best Premium Pick:
Rheem RTEX-18 Electric Tankless Water Heater – Powerful, durable, and built for full-time or luxury RV setups.
Buyer’s Guide: How to Choose the Best RV Electric Tankless Water Heater
- Power Supply: Most RV-ready tankless units require 240V and substantial amperage (40–80A). Always check your RV’s electrical panel and shore power setup before buying.
- Flow Rate (GPM): Match the unit’s gallons-per-minute rating to your needs. 1.5–2.5 GPM is plenty for one shower or sink; 3+ GPM models can serve multiple fixtures.
- Size & Mounting: Wall-mounted, compact designs are easiest to fit in RV closets or utility bays. Always measure your space and plan for adequate ventilation.
- Water Pressure: Electric models work best with strong city or campground water; if you frequently boondock, check minimum pressure specs (often 30 psi+).
- Adjustable Temperature Control: Digital or dial controls make it easy to find your perfect hot water temp, saving energy and protecting plumbing.
- Warranty & Support: Look for at least 3–5 years warranty and responsive customer service for peace of mind on the road.
Top Electric Tankless Water Heaters for RV: Full Reviews
EcoSmart ECO 11 Electric Tankless Water Heater
- 13 kW, 240V, 60A—supports up to 2.0 GPM, ideal for showers and sinks in RVs
- Self-modulating technology adjusts energy use based on demand
- Digital temperature control (80–140°F)
- Compact wall-mount design (11.5″ x 8″ x 3.75″)
- Lifetime warranty (residential use), easy-to-read display
Pros:
- Reliable, energy-efficient, and compact for easy RV install
- Delivers endless hot water for solo or couple RV use
- Easy to set and monitor water temperature
Cons:
- Requires 240V and a 60A breaker—not compatible with all RVs
- Lower flow in very cold climates (best for South, West, or spring/summer travel)
Final Verdict: The best all-around electric tankless for most modern RVs, especially if you want a blend of performance and energy savings.
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Stiebel Eltron Tempra 15 Plus Electric Tankless Water Heater
- 14.4 kW, 240V, supports up to 3.0 GPM—great for large RVs or small homes
- Advanced flow control keeps temperature steady even with fluctuating water pressure
- Silent operation and easy-to-use digital controls
- Proven German engineering, built to last
- 7-year leakage and 3-year parts warranty
Pros:
- Handles multiple fixtures—showers, sinks, or a small washing machine
- Maintains consistent hot water temperature
- Trusted for quality and durability worldwide
Cons:
- Requires higher amperage and 240V service—check your RV’s capacity
- Pricier than basic models, but delivers for full-timers
Final Verdict: The upgrade pick for larger RVs, fifth-wheels, or those with big hot water demands.
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Rheem RTEX-18 Electric Tankless Water Heater
- 18 kW, 240V, up to 4.4 GPM—built for multiple fixtures or luxury RVs
- External digital thermostatic control with LED display
- Durable copper immersion heating elements, field serviceable
- Compact, robust, and easy to mount in any RV storage space
- 5-year warranty, industry-leading support
Pros:
- Handles full-size showers, sinks, and small appliances
- Energy-efficient and ultra-precise temperature control
- Excellent for large or luxury motorhomes
Cons:
- High power requirements—confirm your RV’s wiring and breaker size
- May be overkill for small campers or weekend rigs
Final Verdict: Premium power and comfort for high-end RVers who want the best.
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Bosch Tronic 3000 US12 Electric Tankless Water Heater
- 12 kW, 240V, supports up to 2.0 GPM—ideal for a single shower or kitchen sink
- Sleek, slimline design for tight RV spaces
- Easy install and operation, field serviceable parts
- Runs quietly and efficiently with minimal maintenance
- 5-year warranty on heating modules
Pros:
- Excellent fit for smaller RVs or van conversions
- Reliable Bosch quality, long-lasting build
- Easy to mount and service on the road
Cons:
- Not powerful enough for multiple fixtures at once
- Requires 240V service and proper electrical setup
Final Verdict: Top pick for compact rigs or supplementing an existing RV hot water system.
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Comparison Table: Best Electric Tankless Water Heaters for RV
| Model | Power (kW) | Max GPM | Voltage | Best For | Price Link |
|---|---|---|---|---|---|
| EcoSmart ECO 11 | 13 | 2.0 | 240V | Most RVs, single shower | View |
| Stiebel Eltron Tempra 15 Plus | 14.4 | 3.0 | 240V | Large RVs, multiple fixtures | View |
| Rheem RTEX-18 | 18 | 4.4 | 240V | Luxury, full-timer, big family | View |
| Bosch Tronic 3000 US12 | 12 | 2.0 | 240V | Small RVs, single fixture | View |
FAQ: Electric Tankless Water Heaters for RV
- Can I use a residential tankless heater in my RV?
Yes, if your RV’s electrical system can supply the correct voltage and amperage. Always confirm wiring and breaker size before purchase. - Do I need 240V for electric tankless in an RV?
Most full-size models require 240V. Smaller point-of-use models may work on 120V, but typically won’t provide enough flow for showers. - Are these easy to install?
Many units are DIY-friendly if you’re comfortable with plumbing and RV wiring. For high-amperage models, consider a licensed electrician. - Will they work with campground hookups?
Yes, as long as your shore power can supply the required amps without tripping the breaker. Always check before running other high-draw appliances simultaneously. - What about boondocking?
Electric tankless models are not ideal for off-grid RVing unless you have a powerful inverter and large battery bank or generator.
Conclusion
Electric tankless water heaters make RV life more comfortable by delivering endless, energy-efficient hot water in a compact package. Choose a model matched to your rig’s electrical capacity and hot water needs, and follow install tips for safe, reliable operation. Use this guide and the top picks above to upgrade your adventure—no more short showers or cold surprises!