... 3.Tankless, energy saving Capacity Options: 6L, 8L, 10L, 12L, 16L, 20L with a variety of capacities ... /2" Advantages: Two power systems for choice Water-gas linked automatic control, easy operation; Model of ... Water over high pressure protection device; Over freezing protection device; Super low water pressure starting design Gas Water Heater, Instant Tankless Water Heater, Natural Gas Water Heater ...