Marey Power Gas 16L Tankless Water Heater is the low - cost, high - output choice for hot water! No electricity required! The Marey Power Gas 16L Tankless Water Heater is simple to install and requires just (2) D-cell batteries to operate. Energy-efficient design heats up in seconds and uses gas only while water is flowing. Available in LP and natural gas models. Things are heating up: Adjustable gas and water controls; Electric pulse ignition (2 D-cell batteries required; not included); Activates by water flow when faucet is turned on; Rust-proof... no water loss due to leaks; Anti-combustion and gas pressure safety protection; Works easily with low levels of water pressure; Applicable water pressure: 3.6 - 145.0 PSI; Hot water output per minute: 4.3 gallons per minute; Heat loss: 111,903 BTU / hr; Energy efficiency: 54% - 87%; Exhaust discharge mode: Flue duct type; Measures approx. 28 x 16 1/2 x 8 1/4. Weighs approx. 29 lbs. State Model. Advanced technology saves water and energy! Order Today!* This water heater requires additional equipment (venting kit, pressure valves, professional installation) that may add significant costs to your installation. Please verify these costs before making your purchase.