Older homes, basement heaters
From Philadelphia rowhomes to Pittsburgh's hillside houses and the brick neighborhoods of Allentown, Reading, Erie and Scranton, Pennsylvania's housing stock is old, and its water heaters usually sit in basements next to the furnace or boiler. Shared chimneys are common, and when a furnace or boiler is upgraded to a high-efficiency unit that vents out the side, the water heater can be left in an oversized chimney that drafts poorly. Checking draft is part of any gas water heater service here.
Winters bring incoming water near 40°F or colder, so tanks recover slowly and undersized heaters show their limits from December to March.
Water across Pennsylvania
Philadelphia and Pittsburgh draw from rivers, which are moderately hard and change with the seasons. Many central and eastern Pennsylvania communities on limestone groundwater have hard water, and rural wells can carry iron or sulfur. Flushing every year or two is a sensible default, more often where water is hard.
Licensing, permits and costs
Pennsylvania has no statewide plumbing license. Philadelphia, Pittsburgh and Allegheny County, and many other municipalities license plumbers locally, and most require a permit for a water heater replacement. Ask for the plumber's local license number and whether the permit is included. Typical repairs run $150 to $650, and a standard gas tank replacement usually costs $1,500 to $3,500. See water heater replacement for details.
Each city page below covers local water, common problems and permit and price notes.