Marey ECO180 17.6 kW Electric Tankless Water Heater

The Marey ECO180 is a 17.6 kW whole-house electric tankless sized for 2-bath cold-climate homes or 3-bath warm-climate homes. At 73A continuous draw (two 50-amp double-pole breakers), it requires 200A service or 100A service with substantial load-shed. Capacity: 2.2 GPM at a 60°F rise (northern winter) or 3.3 GPM at 40°F rise (Sun Belt).

Marey's whole-house electric tankless line is value-positioned versus Rheem and EcoSmart. The ECO180 lands around $400 unit (versus $629 for the EcoSmart ECO 27 or $549 for Rheem RTEX-18). The build differences: copper heat exchanger (more frequent descaling required in hard water versus stainless), 10-year heat-exchanger warranty (versus lifetime for the established brands), 1-year electronics warranty.

Right buyer: budget-conscious primary residence installers in soft-water regions, or RV park / cabin installations where the per-unit cost difference matters meaningfully. Wrong buyer: hard-water households (descaling burden becomes problematic with copper exchanger), households expecting 18+ years of service from a premium electric tankless install. About $900–$1,400 installed depending on electrical run complexity.