I have a WaterFurnace using a well and open loop system. I'd like to monitor the water temps going in and out of the heat pump, as well as the flow rate. Anyone have good ideas? I wish WaterFurnace would have included the gauges as part of the system. I've seen reference to "p/t ports". Are those "pressure/temperature ports"? Where are they found? On the system somewhere? Or are they something I need to add. It would be nice to know the temp differential across the coil too! Thanks.

P/T ports are usually Tee'd into the water line hook up at geo unit. If you don't have them, you can test temps on the outside of metal fittings and best pressure testor is a flow gauge (clear cylinder with gpm indications on the side) plumbed into the outlet side of your geo.

You could always look into purchasing a WEL Server from www.welserver.com
If you check a lot of the guys profiles here you will see links to their system and we will have our first system up and running end of this week begining of next at http://www.welserver.com/WEL0626

Bed bath -- walmart -- all have neat digital kitchen thermometers, probes and all

if you ever read the fluid to 1/10th deg, and accurately the difference in Entering to leaving:
look at conditional HEAT OF ABSORPTION extracted to the heat pump in mfg tech book.

est BtuH /~ 485 for antifreeze div by the delata T- to 1/10th deg = GPM est est etc...