Finally went in a on very nice used Maxwater 6 stage RODI unit. I need to install it. I have never done this specific task before but I understand what needs to be done and the basics of operation. The RODI unit has a pressure valve in-line with the input. It seems that high pressure(80+psi) = better performance. Currently, I do not have a value for the existing pressure for my house's lines; I would be guessing and hoping for the best pressure, based on location.
I have two location options to install this unit. 1. utility closet (12'x8') 2. laundry room (18'x10'). Both have floor drains, laundry room has a utility tub. At first i was leaning towards the LRoom because there are already connections in the existing plumbing (1/2" copper lines) for the H/C knobs on the U-tub. I could also get a faucet adapter and run the unit from the utility tub. The utility closet has the main water line (3/4 inch copper) coming into the house and then directly into the hot water tank input.
The UCloset seems like the better option to me because it's the main and holds the best chance of keeping peak PSI from the water main. I was considering doing a sharkbite 3/4" to 1/4" shut off T-valve on that line, instead of a saddle/needle valve (again for performance). The faucet adapter is the most appetizing option because I'm not doing any permanent pipe work, but I feel that this option will have by far the least amount of PSI. Laundry room pipes are smaller diameter, probably still good pressure, but not as easy (or as high of PSI) to do the actual pipe work.