A tank heater is a planned expense, not a surprise. Water quality and age tell you when to budget for it.
A tank water heater has a limited life, and hard water, heavy use and neglect shorten it. Planning ahead lets you pick the timing and the unit.
What hard water does
Water from the Onondaga County Water Authority measures between 115 and 190 parts per million of hardness, about 6 to 11 grains per gallon, which the authority calls moderately hard. The city's supply, from Skaneateles Lake, tests at 127 milligrams per liter. Heating hard water drops minerals out as scale. In a tank that scale settles on the bottom, insulates the water from the burner or element and causes the rumbling you hear. Over time it shortens the life of the tank.
OCWA notes that softeners mostly remove calcium carbonate and stop scaling and spotting, but they do not improve the sanitary quality of the water.
Signs your heater is aging
- Hot water runs out sooner than it used to.
- Rumbling, popping or tapping when it heats.
- Rust color in hot water only.
- A damp pan or stains around the base.
- The manufacture date on the label is well in the past.
One oddity: white flecks that look like powdered soap can be the plastic dip tube inside certain heaters, most likely in units made between 1993 and 1996, breaking down. OCWA says replacement tubes are cheap and easy to fit.
Maintenance that helps
- Flush a few quarts from the drain valve once a year to clear sediment.
- Test the temperature and pressure relief valve by lifting its lever briefly.
- Have the anode rod checked, since it is the part that sacrifices itself to protect the tank.
- Keep the setting at about 120 degrees, which is also what the county checklist calls for.
Repair or replace
Elements, thermostats and valves are cheap parts on a sound tank. If the tank itself is leaking, repair is off the table. If the heater is old and needs a major part, replacement may be the better value.
What the county checklist requires
Onondaga County requires a plumbing permit before a new water heater is installed, even where the homeowner does the work. Its Residential Water Heater Permit Checklist requires, among other items, a full port valve on the cold inlet, a relief valve whose discharge tube ends within 6 inches of the floor, a tank drain valve, a sealed flue held with sheet metal screws, the temperature set to 120 degrees and a drain pan where applicable. Gas-fired tanks need metal hot and cold water lines of at least 18 inches. Photographs of each item are required, including one with a placard showing the date, the plumber, the homeowner and the job address.
Where a pressure reducing valve is on the water service, a thermal expansion tank is required too. The county requirements also call for an approved pressure reducing valve where OCWA line pressure is over 80 psi.
Placement and access
A heater in a tight closet or at the foot of basement stairs costs more to swap than one in open space, since the old tank has to come out and the new one go in. A drain pan and a discharge pipe piped to near the floor are part of the permit checklist, so leave clear room for them. If the unit sits above finished space, a leak sensor on the pan is cheap protection.
Choosing the new unit
Size it to the household, not the old tank by default. Switching fuel adds work such as venting or a gas line. A tankless unit can save floor space and may cost more to install. Ask the contractor for the options with the permit and venting included.
Source Onondaga County Water Authority and Onondaga County Department of Water Environment Protection, read Oct 5, 2026.