Water Heater, Tankless, Gas Connection (In.) 3/4, Gas Type Liquid Propane Gas Type, Input (BTU) 199000, Ignition Type Electronic, Draft Hood Size 3 In., Energy Factor 0.83, Depth 11.25 In., Width 17.875 In., Height 30.5 In., Water Connection 3/4 In., 7.2 GPM @ 45F Rise, 3.6 GPM @ 90F Rise, Standards CSA And ANSI Z21.10.4, Includes Mounting Bracket, Warranty Length 15 Year Heat Exchanger And 3 Year Parts Bosch Gas Tankless Water Heaters1LXD1 and 1LXD2 require no battery or external power source. No standing pilot light. 2KJG9 and 2KJH1 have direct-vent, room-sealed combustion operation. No standing pilot light. Greater than 83% thermal efficiency. Energy Star qualified. Condensing models include modulating feature for higher efficiency; up to 98% thermal efficiency. ASME certified; meet CSA standards. 6FZP2 and 6FZP3 are for residential use. 6FZP4 and 6FZW5 are for commercial use (100 to 180 F). Up to 94% thermal efficiency. Intelligent cascading for up to 24 units. 5-yr. limited manufacturer's warranty on heat exchanger and parts. Horizontal Vent Kit 2KLG1 has a max. temp. of 500 F.