Kenmore water heaters are private-label units sold exclusively through Sears (legacy) and Sears Hometown / online resellers (post-Sears bankruptcy). The actual manufacturer is typically State Industries or A.O. Smith (both are part of the A.O. Smith Corporation family). Maintenance follows standard glass-lined tank practice with brand-specific notes for Sears-era warranty considerations.
Annual maintenance — every year
1. Flush the tank
Sediment accumulates in every tank. Shut off power (electric) or gas, attach garden hose to drain valve, partial drain (3–5 gallons) while pressurized. For hard-water households (>7 grains per gallon), do a full drain-and-flush every 2 years.
2. Test the T&P valve
Lift lever fully for 1–2 seconds. Water discharges and stops cleanly = valve OK. Continued dribble = replace. T&P valves on Kenmore are standard 3/4" NPT, 150 psi / 210°F — any ASME replacement works.
3. Visual leak inspection
Check around fittings, T&P discharge tube outlet, drain valve, anode rod port, and base of tank.
4. Inspect burner chamber (gas models)
Remove the burner access panel. Look for spider webs, rust, weak pilot flame, or yellow burner flame (should be blue). Vacuum out dust; if pilot orifice clogged, clean carefully with a needle.
Every 3 years
Inspect anode rod
Kenmore units use A.O. Smith-spec anodes. Pull from the hex-head port (typically 1-1/16" socket). Inspect: original full diameter = good; 50–75% consumed = note for next inspection; over 75% = replace.
Kenmore replacement anodes: A.O. Smith part 100109109 or equivalent. Universal flexible anodes ($45–65) for tight-ceiling installs. Aluminum-zinc alloy ($30–45) for sulfur-water areas.
Every 5 years
- Replace anode rod proactively (doubles tank life)
- Replace T&P valve preventively ($20–30)
- Inspect dip tube — cracked dip tubes cause "hot water runs out fast" symptoms
- Verify expansion tank charge (5 psi below incoming water pressure)
Kenmore-specific consideration: warranty service
Post-Sears bankruptcy, Kenmore warranty claims route through Transformco (the entity that acquired Sears). Sears Home Services handles in-warranty repairs in markets where they still operate. Out-of-warranty service requires finding a plumber who can identify the underlying manufacturer (State or A.O. Smith) and source parts accordingly.
Common maintenance mistakes
- Skipping flush in hard-water areas (sediment shortens tank life by 3–5 years)
- Forgetting to verify expansion tank pressure (lost pre-charge causes T&P weeping)
- Over-tightening element gaskets (cracks porcelain coating)
- Powering on a dry-fired element (electric models — fill tank fully before restoring power)