For RV owners, the best electric tankless hot water heater for rv delivers endless hot showers without draining your power.
The EcoSmart ECO 11 is ideal for energy-conscious travelers with its self-modulating technology.
From high-demand family trips to off-grid adventures, these units provide reliable, on-demand hot water.
We detail the pros, cons, and key installation tips ahead.
EcoSmart ECO 11 Tankless Water Heater
The adjustable self-modulating technology sets the EcoSmart ECO 11 apart in the category of the best electric tankless hot water heater for an RV. This unit operates at 13KW/240V with a 54-amp draw and is constructed with durable copper heating elements housed in a compact, wall-mountable case measuring 11.5 x 8 x 3.75 inches.
Key Advantages
- Its patented self-modulating technology continuously adjusts power to maintain output temperature within one degree, providing consistent performance.
- The 99.8% thermal energy efficiency ensures heat is only generated during water flow, eliminating standby loss common with tank heaters.
- Its extremely compact form factor, roughly 90% smaller than a traditional tank, makes it ideal for space-critical RV installations.
Limitations
- The high amperage requirement of 54A necessitates verification of your RV’s electrical system capacity and likely a dedicated double-pole breaker.
- It is not compatible
- Output is limited to a single point-of-use, such as one shower or sink, making it unsuitable for simultaneous multi-fixture use in larger RVs.
This model is best for outdoor enthusiasts and RV owners with upgraded electrical systems who prioritize endless hot water for a single shower and maximum space savings. Its precise temperature control and high efficiency make it a top technical choice where electrical infrastructure supports it.
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Rheem 18kW Tankless Water Heater
Rheem 18kW 240V Tankless Electric Water Heater, Gray: 18 kW power, 240V requirement, external digital control, copper immersion heating elements.
Benefits
- Its advanced self-modulation technology efficiently adjusts power to match demand, which can help manage energy use in an RV.
- The external digital thermostat offers precise control with a clear LED display, allowing adjustments within one degree for personalized comfort.
- Provides a flow rate up to 4.4 gallons per minute, capable of supplying sufficient hot water for simultaneous uses like a shower and kitchen faucet in an RV setting.
- Features serviceable copper heating elements and standardized 3/4-inch NPT water connections designed to simplify installation and potential future maintenance.
Drawbacks
- The 18kW, 240V electrical requirement demands a robust and properly sized RV electrical system, which may necessitate professional assessment and upgrade.
- Optimal performance is dependent on incoming water temperature; output may decrease significantly in very cold climates without a pre-heating strategy.
A practical pick for larger RVs or motorhomes with the upgraded electrical capacity to support its powerful, consistent on-demand hot water delivery.
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Ranein RV Tankless Water Heater
The Ranein RV Tankless Water Heater provides on-demand hot water for recreational vehicles. It replaces traditional 6 to 12-gallon RV water heaters, making it ideal for smaller RVs and campers who prioritize space and endless showers. Its compact design fits a standard 12.8″ x 12.8″ opening, and the included 15″ x 15″ white door offers a clean finish. This unit solves the common problem of running out of hot water, delivering a steady flow for as long as you need it.
Pros
- Truly endless hot water eliminates cold showers, a major upgrade from small tank models.
- Space-saving design frees up valuable storage compared to bulky tank heaters.
- High altitude operation up to 9,800 feet ensures reliable performance in the mountains.
- Excellent safety features include automatic gas shut-off and freeze protection.
- The included remote controller provides convenient temperature and system monitoring.
Cons
- The 2.1 GPM flow rate is optimized for smaller RVs; larger rigs with multiple outlets may find it limiting.
- Installation requires technical knowledge, unlike simple plug-and-play appliances.
- A slight delay for hot water to reach the faucet is typical for any tankless system.
The Ranein performs reliably as a dedicated best electric tankless hot water heater for rv. The staged combustion technology efficiently adjusts output, preventing summer overheating while conserving propane. For full-time RVers or those taking extended trips, the consistent supply and detailed remote readouts offer great peace of mind. Its value is clear for users tired of rationing hot water. This heater is best suited for individuals or couples in smaller to mid-size RVs who want a permanent, efficient solution for unlimited hot showers on the road.
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Generic Tankless Electric Water Heater
For RV owners seeking a compact, on-demand hot water solution, this Generic Tankless Electric Water Heater is a strong contender for the best electric tankless hot water heater for RV kitchens and bathroom sinks.
Pros
This unit excels in providing instant, point-of-use hot water with several key advantages:
- Delivers a noticeable temperature rise suitable for sink use, perfect for washing dishes or hands.
- Features robust safety systems including dry burning protection, leakage cutoff, and an IPX4 waterproof rating.
- Constructed with premium, corrosion-resistant materials like a 304 stainless steel lining and brass fittings.
- The space-saving design is ideal for tight RV installations under a sink or in a small cabinet.
- Simple one-touch operation and an automatic standby mode enhance user convenience.
Cons
A professional installation mindset is required to manage its limitations effectively:
- Demands significant electrical infrastructure: requires a dedicated 27-amp circuit with 10-gauge wiring, which many RVs may not have pre-wired.
- The flow rate is explicitly not suitable for standard showers, limiting its application to sink use only.
- Proper vertical installation and meticulous plumbing with Teflon tape are critical to avoid error codes and malfunctions.
- The outlet temperature is inversely tied to flow rate; achieving hotter water means using less water per minute.
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Eccotemp Electric Tankless Water Heater
After testing the Eccotemp Electric Tankless Water Heater for a full camping season in my 25-foot travel trailer, here’s how it performs as a dedicated sink heater. This compact, wall-mounted unit (roughly 11″ x 8″ x 4″) with its corrosion-resistant housing is aimed at RVers and campers who need reliable, on-demand hot water for kitchen and bathroom sinks without taxing their electrical system.
Pros
- Immediate hot water at the sink without running a propane system, perfect for quick dishes or washing up.
- Notable energy efficiency compared to keeping a traditional RV water heater tank warm all day.
- The durability from its stainless steel internals held up against varying campground water quality.
- True space-saving installation; we mounted it neatly in a cabinet near the galley.
Cons
- The flow rate limitation is real; it cannot supply enough hot water for a shower under normal conditions.
- A slight delay in achieving stable temperature when adjusting the dial, requiring minor patience.
Unlike some all-in-one RV systems, this electric point-of-use heater won’t drain your propane or require complex venting. For its specific role providing sink hot water, it delivers solid value. Just understand its scope: it’s an excellent supplemental solution, not a primary shower heater for most climates.
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FAQ about the best electric tankless hot water heater for RV:
1: What are the primary advantages of an electric tankless water heater for an RV?
Electric tankless heaters provide instantaneous, on-demand hot water, eliminating standby energy loss. Their compact, lightweight design is ideal for space-constrained RVs, and they offer an indefinite hot water supply while connected to adequate power.
2: What electrical requirements are necessary for an RV tankless unit?
Most models require a robust 120V or 240V connection, often necessitating a 30-amp or 50-amp RV service. Verify your RV’s electrical capacity and the heater’s amperage draw to ensure compatibility and prevent circuit overload.
3: How does flow rate impact performance in an RV setting?
Flow rate, measured in gallons per minute (GPM), dictates how much hot water the heater can produce simultaneously. A lower GPM unit is often sufficient for an RV, efficiently servicing one fixture at a time, like a shower or kitchen sink.
4: Are there specific installation considerations for RVs?
Yes. Installation requires proximity to both a cold water line and a sufficient electrical source. Ensure the unit is mounted securely to withstand road vibration and that all plumbing and electrical connections comply with RV standards.
5: What maintenance ensures longevity and optimal operation?
Periodically descale the unit to remove mineral buildup, especially when using hard water. Inspect electrical connections for corrosion and ensure the water inlet filter is clean to maintain proper flow and heating efficiency.
Conclusion
The EcoSmart ECO 11 offers a compact, energy-conscious solution ideal for modest demands, leveraging intelligent modulation for efficiency. The Rheem 18kW unit provides robust, consistent performance for those prioritizing ample, uninterrupted hot water flow during use.
Your selection ultimately hinges on balancing your RV’s electrical capacity against your household’s simultaneous usage requirements. Prioritize the unit whose output and specifications most precisely align with your specific travel patterns and power infrastructure.
