When starting the DSH the first time after piping it, I was having doubts about the pump getting power, even after the unit had run for a while and should have been warm enough.  I suspected the suction pressure/temperature switch (normally open switch to enable the DSH circ pump once the ref circuit reaches an elevated temperature), as I had heard that some of other CM TTV units had an R22 switch (higher temperature/setting to close) instead of R410a, and the circ pump would rarely if ever be allowed to run.  I bypassed the switch and it has ran fine ever since.... the circ pump runs whenever the compressor is engaged.   

At any rate, I have since left it bypassed …     I was thinking through the implications.  In heating mode I thought it would be fine because if the buffer tank happened to be warmer than the refrigerant circuit (I don’t anticipate this condition happening much, if ever), the DSH heat exchanger would temporarily move heat from the buffer tank to my house, until the ref. circuit warmed up, so no heat would be “lost” or dumped. In the summer, I assumed that since we live in a heating dominate climate, use a fair amount of HW every day, have ~50-55 deg or colder replacement water from a well, and have a 50 gal buffer tank…. there’s very little chance that buffer tank temp would be above the ref circuit temperature…. and thus in the cooling mode as well, dumping the buffer tank BTU’s down the drain would be prevented.

I guess I'm looking for a reality check or confirmation on this.   Anyone see any potential problems I may have with operating it this way ?