Update by user Jun 08, 2021 The support personnel helped me with my questions. They said it was acceptable to use the 1/2” gas line as long as my state codes allow.. Original review posted by user Jun 04, 2021 Calling to find out if I can use 1/2 water supply and 1/2 natural gas line supply. When I ordered it from Home Depot, the website said it could be adapted to accept 1/2. But reading through the manual, it says I have to use 3/4 supply for gas and water. I bought the Rheem performance platinum 11gpm natural gas unit. Model # ECOH200DVRHLN. Any help would be greatly appreciated