Signs it's time to replace, not repair
- The tank itself is leaking. Water coming from the seam or the bottom of the tank means the steel has failed. Tanks can't be patched, and a repaired leak usually comes back within weeks.
- The unit is past its teens. Age is in the serial number on the label; the first digits encode the month and year it was made.
- Rusty hot water. If cold taps run clear and hot taps run orange or brown, the tank is rusting from the inside, usually because the anode rod was spent years ago.
- Popping and rumbling. A thick layer of hardened sediment insulates the water from the burner, so the tank works harder, runs longer and fails sooner.
- Repairs are stacking up. A new element and a new valve on a twelve-year-old tank is money toward a heater that's still old.
If the problem is a part on a younger tank — an element, a thermocouple, a relief valve — repair is usually the better spend. See the main water heater repair page for what can be fixed.
What the job involves
A like-for-like replacement, same fuel, same spot, is the straightforward version:
- The plumber shuts off the water, gas or power and drains the old tank.
- The old unit is disconnected and hauled out (confirm haul-away is included in the quote).
- The new tank is set, connected, and the relief valve and drain pan are checked.
- On gas units, the venting is inspected and the burner is lit and tested. On electric units, the elements and wiring are checked before the breaker goes back on.
- The tank is filled, bled of air, and the plumber confirms the temperature setting — about 120°F is the efficient, safe setting recommended by the U.S. Department of Energy.
Converting from electric to gas, moving the heater, or switching to tankless adds venting, gas-line or wiring work, and may add a permit.
Permits
Water heater replacement often needs a plumbing permit, especially for gas work. Rules are set locally, so ask the plumber what applies to your address, or check with the building and codes office for the city or county where you live. Ask whether any permit is included when you compare quotes.
What affects the price
Every quote is different, and no number here is a quote. The price moves with: the fuel type and what's already in place (gas to electric or the reverse means new lines or wiring), the size of the tank, whether venting must be upgraded, how tight the space is, whether code now requires anything the old install didn't have (a drain pan, an expansion tank, seismic strapping is rare here but expansion tanks are increasingly standard), and whether the job is an emergency call-out or a scheduled appointment. Ask for the full price, permit and haul-away included, before work starts. For a longer discussion of budgeting, the plumbing costs guide covers how plumbers price jobs — it's being written now and will be linked here.
Sizing the new heater
Bigger isn't automatically better. A three-to-four-person household usually lands on a 40- or 50-gallon tank. What actually matters is peak demand: how many showers, loads and dish runs overlap in the morning. The plumber will ask about bathrooms and household size. If you run out of hot water regularly with a tank that "should" be big enough, tankless water heater installation is worth comparing, since it heats on demand instead of storing.
Johnson City specifics
Water heaters here live in garages, closets and crawlspaces, and crawlspaces complicate the job: a heater that has to be carried under the house takes longer and sometimes means a compact or lowboy unit. Winter is when tanks give out — cold inlet water makes the burner run longer against a sediment layer that took years to form. If your tank is over ten years old, replacing it on your schedule beats replacing it during a January cold snap, when plumbers are running freeze calls all day.
Before you call
Photograph the label on the existing heater (make, model, serial), note whether it's gas or electric, and measure the space if it's tight. If the tank is actively leaking, shut off the cold-water valve on top of the unit and the fuel or power to it, then call.