I'm in St. Louis, Missouri and will be converting my existing Propane Furnace and A/C unit to Geothermal. I've received several quotes that I'm happy with. I think I would like to go with the GeoComfort Navigator 4 ton (GYT048) with probably 3 x 200ft vertical loops drilled by geothermal subcontractor for my home. My quote is for a little over $20k (before tax credits) and I provide the electrical drops and a spare water storage tank for desuperheating. I will also install or have installed a tankless propane water heater feeding from the storage tank. I asked how he determined 4ton and he stated based on the number of systems he installed similar to my home and in his own home. He said he can do the load calculations if I like. I've seen several questions after reading threads on here. 1. Any issues with the above? 2. The proposed Flow Center is quoted as mod#GeoFLow AGFC2. Is this a pressurized system with 2 pumps and should I be requesting a more efficient pump? 3. If I purchased the tankless system myself at this same time, Can I submit this with my claim for the tax credits or would I need to have the HVAC guy sub-k it and put it on the same bill to ensure tax credits approval?