I was formerly a apartment maintenance tech for several years. The complex had hydronic coils in every unit. Some advice, these units can be very problematic. I always reccomend manual shutoff valves on the coil. Also i advise a drain valve on the output line of the coil before the shutoff. the drain inside the unit is cheap plastic and because i think the exchanger should be flushed before every heating season, an external valve is best. If maintained properly, these units run very well with little breakdown. hope this helps[:-paperba
