EcoSmart ECO 11 11kW Electric Tankless Water Heater

The EcoSmart ECO 11 is the company's small-home / single-bathroom electric tankless. At 11 kW (single 60-amp double-pole breaker, about 46 amps continuous draw), it's the smallest whole-house electric tankless that genuinely delivers on the "whole-house" promise — for the right house. That house: 1 bathroom, 1–2 occupants, southern climate. In those conditions it produces about 2.5 GPM at a 40°F rise, enough for a comfortable shower with simultaneous handwash use.

In northern climates with groundwater under 50°F, the ECO 11 drops to roughly 1.7 GPM at a 70°F rise. That is a borderline shower — usable but on the light side. For northern 1-bath homes the ECO 18 or ECO 24 is the safer pick. For southern 1-bath homes the ECO 11 is the right size at the right price.

Key specs: stainless steel heat exchanger (better scale resistance than copper), patented self-modulating technology, lifetime warranty on heat exchanger plus 5-year electronics. About $239 unit, $700–$900 installed assuming the existing 100A panel has room for a 60A breaker after standard household loads. For homes already loaded near capacity, the load calc may not pass — verify with an electrician before purchase.