Was concerned but had to do something, they stopped making water heater we needed, anyways I installed this product was 3.5 inches smaller on height and width, it's a old hud trailer, water lines were like a pex that coupled up and gas coupled up also no issues as far as electric again no issues I put the digital display down low ran wire through wall soldered it you can't screw this up ,so easy, then hooked hot wire up and ground, I had a bad ground on old trailer ,cleaned connections up ,turneSee full review