This device can be widely used the constant temperature swimming pool and sauna constant hot water system. Which supply hot water to heat the pool or provide the hot water. Type: Side discharge and Top discharge. Capacity ranges from: 3.5kw, 4.2kw, 7kw, 9kw, 12kw, 15kw & 20kw for side discharge. 4.2KW, 5.3KW, 8KW, 12KW for top discharge. Gas: R407C mainly. With Titanium Exchanger with long operating life. Galvanized panel which is rustless. With CE approval. With RoHS compliance. For more information regarding us,