For Use With Rheem Tankless Water Heaters, Material of Construction Wire and Plastic, EZ-Link Cable Connector Rheem Gas Tankless Water HeatersHave precise temperature control and self-diagnostic system that displays maintenance codes. Include Guardian OFW overheat film wrap, remote control, 10-ft. thermostat wire, and 120V power cord. Units have a 0.26 gpm flow rate and 0.40 gpm activation flow rate. Heaters can be converted to a commercial unit (with temps. from 140 to 180 F) using conversion kits 6FZN8, 6FZN9, 6FZP0, or 6FZP1, sold separately. 12-yr. limited manufacturer's warranty on heat exchanger, 5-yr. on all other parts. Optional EZ-Link 6FZN4 cable unit can connect 2 or more units for higher demand applications. Allows 2 heaters to operate as 1 unit. Optional Manifold Controller System 6FZN5 can connect up to 6 heaters. Each controller requires 1 Control Cable (6FZN6 or 6FZN7) for each additional heater.All water heaters meet ANSI, NAECA, ASHRAE standard 90; CSA, NSF, and GAMA.3/4" gas and water connections Water heaters are Energy Star rated