Start with the tank

Almost every part on a water heater can be swapped: thermocouples, flame sensors, gas control valves, elements, thermostats, dip tubes, anode rods, drain valves and relief valves. The one thing that cannot be fixed is the tank itself. So the first question for any plumber is simple: is the tank sound?

If it is, a repair is often sensible. If the tank is corroding, leaking or full of years of hard-water sediment that can no longer be flushed out, money spent on parts may only buy a short reprieve.

Repair versus replace at a glance

Repair usually makes sense when

  • The tank is dry and shows no rust at the base
  • A single part has failed, such as a thermocouple or element
  • The heater is early or mid-way through its expected life
  • It is the right size for the household
  • Straps, venting and the relief line are already in good order

Replacement usually makes sense when

  • Water is leaking from the tank body
  • Hot water from the tank is rusty
  • The heater is late in its service life and parts keep failing
  • Sediment has built up beyond what flushing will clear
  • You want a different size, fuel or type anyway

Finding the heater's age

Age is not printed plainly, but it is usually on the label.

  1. Find the rating label.It is on the side of the tank, often near the gas valve or the electrical cover.
  2. Read the serial number.Most manufacturers encode the month and year of manufacture in the first characters of the serial number.
  3. Check the manufacturer's key.Each brand uses its own format. A plumber can usually read it on sight, or the maker's support pages explain it.
  4. Note the warranty length.The label or paperwork often states the tank warranty period, a rough guide to the expected design life.

What drives the cost of each path

Repair
Which part failed, whether it is in stock, and access to the heater
Same-type replacement
Tank size and fuel, removal and haul-away, new straps, connectors and relief line
Code updates
Venting, gas connection, expansion tank or drain pan brought up to current requirements
Type change
Gas line upsizing, new venting, electrical circuits or condensate drains for tankless or heat pump units
Permit
Whether the city requires one for your job; check with the City of Brea

Questions that settle the decision

  1. Is the tank itself sound, and how did you check?
  2. How old is this heater according to the serial number?
  3. If I repair it, what else is likely to fail soon?
  4. Is anything about the current installation out of date, such as straps, venting or the relief line?
  5. Would you recommend the same size and fuel, and why?

Common questions

Is it worth replacing a thermocouple on an old water heater?

Often yes, since it is a small part, as long as the tank is dry and sound. If the tank is late in its life and shows rust or sediment problems, ask whether replacement is the better use of the visit.

Does a repair need a permit?

Simple part replacements usually do not, but replacing the heater commonly does. Check with the City of Brea for current requirements.

Should I replace a working heater before it fails?

Some owners do when a heater is late in its life, especially if it sits indoors where a leak would cause damage. Ask a plumber to assess its condition rather than going by age alone.

General information for Brea, not a quote or professional advice. In an emergency, call 911.