DC's historic rowhouses present a specific challenge for tankless water heater installation: tight basement or utility-closet spaces, original gas lines sized for late-1800s or early-1900s appliances, and DC Department of Buildings permitting requirements that demand a licensed plumbing-gas master contractor. Tim Whistler Plumbing handles all three. Our DC plumbing-gas master license is PGM-1002028, and we pull DC DOB permits as part of every tankless installation.
DC rowhouses are tight on space, so the wall-mounted footprint of a tankless unit (versus a 50 to 75 gallon tank on the floor) is often the deciding factor. Energy efficiency and longer service life are the secondary drivers. For homes with multiple bathrooms on multiple floors (typical of a renovated DC rowhouse), a tankless unit can deliver consistent hot water without the recovery time delays of an undersized tank.
One DC-specific consideration: many older DC homes have original gas lines from the late 1800s or early 1900s. These often need to be evaluated and sometimes replaced or upsized to handle the higher BTU demand of a tankless unit. The DC DOB permit process requires the work to be performed and inspected by a licensed gas fitter, which we hold.
We assess the existing water heater location, gas service capacity (and condition, for older homes), venting routes (sidewall is often easier than roof venting in a DC rowhouse), and electrical service. We pull the DC DOB plumbing-gas permit, install the unit, pressure-test the gas line, and coordinate the DC inspection. The old tank is removed and recycled.
Tankless gas water heater installation in DC typically runs $4,500 to $8,000 installed, with the higher end of the range driven by older-home gas line work and venting modifications in tight rowhouse spaces. DC permit fees are included in the quote. We provide a written, itemized quote before any work starts.
Yes. Tankless installations in DC require a plumbing-gas permit pulled by a licensed contractor. We pull the permit on your behalf, schedule the inspection, and meet the inspector. Our DC plumbing-gas master license is PGM-1002028.
The lead service line replacement is a separate decision but often makes sense to combine with a tankless install because you are already coordinating utility and DC DOB inspections. DC Water has a lead service line replacement program that may help with cost.
Call Tim Whistler Plumbing at 1-866-477-6190 for a free written estimate on tankless water heater installation in DC. Licensed across DC, Maryland, and Virginia (DC PGM-1002028, WSSC 6119360, VA 2710020030).