Hi southerntester
You got kind of a loaded question there. Here is the skinny on the pump systems. You are going with closed loop in your post. However there are true closed loop and there is what some call closed loop that actually uses a pump center with a resivoir. If you are going with a true closed loop the pumps can be sized more for the actual maximum needed gpm. Let me explain. In a true closed loop system you have less resistance because the system is under about 40 psi of pressure and a constant volume control without having to overcome the effects of the atmosphere. This is the method I most prefer because you have less likely hood of outside contamination and very little water loss. If you use a flow center you will want to upsize the flow requirements by about 25% due to atmoshpere changes. The changes that most effect this are thermal. On this type of set up vescosity changes are more prone, this is why I reccomend upsizing the pumps. Not everyone agrees with me on this, but I have never had any call backs in the middle of winter or summer using this method. I promise you that you will thank me if you follow my advice. As far as the rest of it, the heat pump has a flow regulator built into it that runs off of the head pressure of the compressor. Just make sure you do not scrimp on the loops, and do not use the slinky loop design. This is not the best way to do a loop.
Good luck
Rusty
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