... copper pipe with different capacity options tankless, energy saving Rated input: 10KW, 12KW, 14KW, 16KW, 18KW, 20KW, 24KW, 32KW, 40KW. Rated ... ; Model of Ignition Methods: Impulse Automatic Ignition; Gas Exhaust Type: Flue duct type; Summer & winter switch for choice; Over-heat protection device ...