... , instant heating. all copper pipe with different capacity options tankless, energy saving Capacity Options: 6L, 8L, 10L, 12L, 16L, 20L ... 10KW, 12KW, 14KW, 16KW, 18KW, 20KW, 24KW, 32KW, 40KW. Rated hot water output: 5 L/min, 6 L/min, 7 L/min ... for choice; Over-heat protection device; Avoid dry burning; Unexpected flameout protection device Low start water pressure; Water pressure stabilizing design; ...