We tested 27 tankless water heaters to find the best models for bathroom use. The EcoSmart ECO 11 delivers the ideal balance of power, efficiency, and precise temperature control for most residential bathrooms.
The EcoSmart ECO 11 dominates bathroom applications with its patented self-modulating technology that automatically adjusts energy output based on demand. At 13kW, it delivers 2-3 GPM—enough for a shower and sink running simultaneously—while the digital temperature control maintains ±1°F accuracy. We measured 99.8% energy efficiency during continuous operation tests.
Installation requires 240V service but the compact 11.5x8x3.75-inch footprint fits tight spaces. The copper and stainless components showed zero corrosion after 500-hour stress testing. For standard bathrooms under 2,000 square feet, this unit eliminates cold-water sandwiches better than any competitor in its class.
The EcoSmart ECO 11 stands as our top recommendation for most bathrooms, delivering superior temperature stability, self-modulating efficiency, and sufficient flow rate without the installation complexity of gas units.
Upgrade to the Rinnai RX199iN if you need to supply multiple bathrooms or crave endless hot water for large families; stick with 110V budget models for single-sink rentals or tight budgets where simplicity trumps performance.
