I just had a Rheem Elite system installed. I kept hearing water and waves in the morning and knew the PVC lines were holding water. I have about 12-18 inches of 2 inch pipe on each end but most of the run is 3" for about 12 horizontal feet. They were not pitched toward the furnace for drainage at all. I called them back and they lowered the inside exhaust line about 4 inches (dumping 2 gallons) but not the intake line. When I asked why not both lines the technician claimed no need? Is this true?
Also I live in SE Pennsylvania and it is not unheard of to have 2-3 feet of snow, even more against my house on the deck. I am nervous if I leave for a couple days and snow builds up over the lines it will shut down freezing pipes and my pet. The technician claimed I can not raise the outdoor lines more or it will add too much resistance? The outside portion is not glued to allow me to adjust it but he just barely fit 2" pipe through the wall. Need I be concerned about this? See Photo attached. What is proper? Thanks