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Hot water at the sink or shower is one of the bigger comfort trade-offs in RV living, and a tankless electric heater is one of the more practical fixes when you’re plugged into shore power. Unlike propane tank heaters, these units skip the pilot light and holding tank entirely, heating water only as it passes through. That makes them compact enough to tuck into a cabinet or bay, which matters when every cubic inch of an RV is already spoken for.

The core trade-off with electric tankless heaters is that they need real electrical capacity to produce real heat. A propane heater draws fuel from a tank; an electric one draws amperage from your panel or campground pedestal, and 110-120V units rated at 3,000 to 4,500 watts pull enough current to matter. Before buying, it helps to understand your RV’s wiring, breaker capacity, and what size shore power connection you typically use.

Best 110 volt Tankless Water Heater for RV buyers should pay close attention to listed wattage, required breaker size, wire gauge, and whether the installation calls for hardwiring or a standard outlet. Flow rate and temperature rise are linked: higher flow means less time for the unit to heat the water, so manufacturers list a specific gallons-per-minute rate tied to a specific temperature increase. A unit rated for a bathroom sink will behave differently at a kitchen faucet or a shower head, so matching the product to your actual use case avoids disappointment.

Best for single-sink installations with verified RV installs: CAMPLUX Tankless Water Heater Electric 120V, 4.5kW
Best for lower-amperage setups: 110V Tankless Water Heater Electric, 3000W
Best for shower-style point-of-use with included shower head: Tankless Electric Hot Water Heater, 4500W 110V

CAMPLUX Tankless Water Heater Electric 120V, 4.5kW

This is a solid pick for RVers who need hot water at a single sink and have the electrical capacity to support a 40-amp circuit.

Pros

  • CSA certified with a self-modulating design that adjusts power to flow and temperature settings
  • Compact wall-mount footprint fits tight cabinets or utility bays
  • Multiple reviewers report years of reliable service in campers and outbuildings

Cons

  • Requires a dedicated 40A breaker and 10AWG wire, a significant draw for many RV electrical systems
  • Must be hardwired, not plug-in, which adds installation complexity
  • Rated for one sink at a time, not a whole-RV solution

CAMPLUX markets this unit for kitchens, wet bars, and boats, and reviewers confirm successful installs in campers and cabins. The catch is the 40-amp requirement: that’s more than many RV panels or 30-amp shore connections can comfortably spare alongside other appliances. Reviewers mention tripped breakers when paired with heavy simultaneous loads, so check your panel’s available capacity before ordering. For a single sink with 120V, 40A service available, it heats water in seconds and multiple owners report it running for years without issue.