One other note, by using the 3/4" Vanpex fittings, you are effectively reducing the inside diameter of the water line to 1/2" at each fitting. The unit has 3/4" inlets and the reduced inside diameter fittings will reduce the potential volume of water flow through the unit. We use 3/4" hard copper, type L or use 3/4" Wirsbo/Aquapex fittings and tubing. Good to see a real 3/4" ID gas supply line. A lot of plumbers use a 5/8" ID flex gas supply and it will limit the gas flow and throw the unit into an error code when running high.