I'm about to install a new direct vent gas-fired water heater. I'm essentially replacing the old chimney vented which is in a crawl space, this will be in the laundry area and vent out the back of the house 2' from ground. I will also have to run a gas line and water lines about 8' from the old line. What will my inspector be inspecting, and are they're any test involved? In Mass.