I own a two family house, and the supposedly disconnected water heater for the rental unit began leaking. I called KOD based on an acquaintances recommendation. KOD came to look at the issue within the hour (on Columbus Day). They identified the problem: when we had new combination water heaters/boilers installed 9 months previously, the contractors had not disconnected this water heater, which was feeding the tenants washer. It was also venting to the chimney (which we had had bricked up since the new boilers dont use it not good). KOD disconnected the heater that evening. Ultimately we asked them to come the following day and re-route the plumbing, remove the water heater, and remove the two large (huge) cast-iron boilers (circa 1950) that had been left behind. They also identified a small gas leak in a different section of pipe (I had thought the smell was just basement air). Fast, knowledgeable, professional service I highly recommend them.