I have a small house with a well and pressure tank set to produce between 30-50 lbs. pressure. This works great. We now want (actually need to for space considerations) to install a tankless WH but wonder if the varying pressure from the well tank is going to screw things up with the tankless which probably likes constant flow rates. Tankless will be Rinnai 53i. Small house with 2.5 gph shower as the longest HW draw. Do you think it will be OK?