Saves energy, water!Marey Power Gas 10L Tankless Water Heater requires NO electricity to deliver long het water ! . It 's to install and requires no electricity to operate. Energy-saving design up in seconds and uses gas solitary while water is liquid. in LP and unbleached gas models. adaptable and water controls ; Electric pulse ignition powered by 2 D-cell batteries -LRB- not enclosed -RRB- ; Activates by water flow when regulator is turned on ; Rust-proof ... no water loss cod to leaks ; Anti-combustion and gas pressure safety protection ; Works easily with low-set levels of water pressure ; relevant water pressure : 3.6 - 145.0 psi ; het water output per microscopic : 3.1 gallons ; Energy efficiency : 54 % - 87 % ; Exhaust discharge mode : Flue canal type ; Gas Types : Liquid Propane Gas, unbleached Gas ; Dimensions : Approx. 24 '' x 14 '' x 7 '' ; Weight : Approx. 21 lbs. ; Mfg. Number : GA10LP -LRB- Liquid Propane Gas -RRB-, GA10NG -LRB- unbleached Gas -RRB- ; Marey Gas 10L Tankless Water Heater .