Tankless water heaters in Aldie.

More than nine in ten homes in Aldie’s ZIP went up after 2000, and the median owner home is from 2013. Nobody here is nursing a 1970s tank along. The people who call about tankless have a house with more bathrooms than the hot water can serve, or a tank around its tenth year, or both. That makes it a planning job rather than an emergency one, which is the easiest way to do it.

Gas is already in the street for most of the ZIP. Almost eight in ten owner homes burn it, and Stone Ridge’s association names Washington Gas among its utilities. Houses built in the last twenty years often come with a gas line meant for a fireplace and a range as well as the furnace, so a tankless frequently fits with little pipe work. We still read the meter size and the run before quoting, because a fireplace and a tankless firing together is the case that decides it.

Stone Ridge, Kirkpatrick Farms and the Willowsford streets mix detached houses and townhouses, close to a third of the ZIP’s homes being townhouses. The vent has to leave through an outside wall, so a townhouse in a row has fewer choices than a single-family house on its own lot. Which wall is usually obvious once we stand in the utility room.

Out past the villages, about one owner in twenty heats with propane, and those houses can take a propane tankless on the tank they already have in the yard. On a well there is one more thing to settle. A tankless wants steady water pressure and flow to fire cleanly, and a pressure tank that swings between cut-in and cut-out can make the unit flicker. We check the well side before we recommend it.