Gas, venting and the permit in Matthews
A tankless conversion is a permit job without exception, because it changes the fuel routing, the venting, or both. In Matthews that goes through Mecklenburg County, and we pull it rather than working around it.
Three things decide whether the install is straightforward or not:
- Gas line capacity. The single most common reason a tankless quote comes in higher than expected. We size the line to the real load rather than assuming the existing one will do.
- Venting. Condensing units need their own sealed venting and a condensate route. Where the old tank vented into a shared flue, that flue may now be oversized for whatever is left on it.
- Where it goes. Garage and crawlspace both common given the build era, with closet installs in the newer infill. Access is generally reasonable but the older subdivisions have tighter crawlspaces than the 2000s stock.
What Matthews itself changes
The housing in Matthews
Matthews is older than its reputation. The peak build decade is the 1980s at 23.1%, and 1980 to 1999 together account for 45.3% of the housing stock. That makes Matthews a third-cycle replacement market rather than a first-failure one: most of these homes are on their second or third water heater already, and the tanks going in now are replacing tanks that themselves replaced the original.
The pipe era
Matthews sits squarely in the polybutylene window, with 45.3% of the stock built between 1980 and 1999. If you have grey plastic supply pipe, that is a planning and insurance question worth separating from whatever your water heater is doing today.