On my San Juan Engineering H/E, the raw water enters at the bottom of the unit and exits from a port on the side of the unit. That makes the exit higher than the entry. Both ports are at the same end of the tube.
these things normally follow a heat rises pattern.. hotter at the top.. cooler at the bottom.. on the raw water side that would be in at the bottom out at the top.. <br /><br />on the engine circuit side it would be the other way round.. in at the top and out at the bottom..<br /><br />trog100
