Before we install a Water Pressure System, i want an idea of what to buy in the way of tank, pump, plumbing and electrical. Installer will cover details. We have a rental and the landlord is covering biggest percentage (their retirement home), so it should be simple but good, not great. Currently 3 residents, 2 baths, kitchen. Up near the airport, current pressure ok but low at times. What should we be looking at in way of tank size and pump size ??? Any other considerations ?? As Hawk pointed out in an ancient post, Polaris is the most likely go-to for a water system. I wanted to pay an architect for some info, but none of the four we were introduced to returned our texts, all obviously way too busy for simple consultation.