Tankless Water Heaters in Smithfield, NC

What does a tankless conversion involve in an older Smithfield house?

Smithfield's housing is older than the Wake suburbs: the median home was built in 1973 and about 65% predate 1980, per Census survey data. In houses that age, a gas water heater usually vents through a flue it shares with the furnace, and the gas line was sized for those two appliances. A tankless unit needs its own sealed vent, typically through a sidewall, and a gas supply that can handle its much higher peak demand. Electric tanks in older homes often sit on a single circuit, which isn't enough for a whole-house electric tankless unit.

None of that rules tankless out. It just means a site visit, not a phone quote, is the honest starting point.

Is Smithfield's water hard on tankless units?

We can't say precisely. The Town treats its own Neuse River water and disinfects with chloramine, but the 2025 report doesn't include a hardness figure. The practical approach is to follow the manufacturer's descaling schedule, often once a year, and see what comes out the first time. If buildup is light, the interval can stretch. Homes in the separate Smithfield South district get water from Johnston County Utilities, and outlying 27577 homes may be on private wells, which should be tested first.

Who supplies gas, and who signs off on the work?

Johnston County is in Piedmont Natural Gas territory, with service varying by street. If there's no main near you, propane and electric tankless units are the alternatives.

For permits, Smithfield's planning FAQ says Johnston County Building Inspections has been contracted to manage building permit inspections for the Town, and the Town's planning office issues zoning permits where those apply. The county office is on East Market Street. A tankless conversion changes venting and gas input, so expect a permit; the plumber normally takes care of it.

One more thing

Many tankless problems, such as a burner that won't stay lit or hot water that fades, trace to scale, a clogged inlet screen or a sensor, and can be repaired. If you smell gas at any point, leave the house and call 911 or Piedmont at 800-752-7504 from outside.