The client and I talked about a lot of things relating to water heaters and softeners. There is a 1” gas line, presently. Adding a tankless will require a bigger gas pipe or increasing the gas pressure coming into the house. This will require individual gas regulators placed at every gas appliance. This would require an added expense. The existing 2” pvc exhaust should be increased to 3” for any water heater installation. The 75 gallon power vent would require two 3” pipes. The softener can be installed by the mainline valve tree with the addition of a drain for the softener discharge. I gave estimates for work. I also gave a price to flush the existing water heater and to change out the existing anode rod. From my initial research, a 2” pipe can not exceed 25’ with 3 elbows. The existing run has, at least, 4 elbows and 1 45. The existing run exceeds allowances but I am confirming my initial numbers.