Kenmore 153334450 gas water heater Parts

A typical 50-gallon gas water heater, including Kenmore model 153334450, lasts 8 to 12 years. Water quality, maintenance (especially flushing sediment), and correct temperature settings have the biggest impact on whether it reaches the high end of that range.

Typical lifespan and what affects it

Most tanks fail from internal corrosion or heavy sediment buildup that overheats the bottom of the tank.

• Water hardness and sediment: hard water shortens life if the tank is not flushed
• Temperature setting: higher temps increase scale and stress components
• Usage level: heavy daily demand increases burner run time
• Maintenance: periodic draining and inspection extends service life
• Early warning leaks: small seepage often becomes a full tank leak

Signs your water heater is near end of life

If you see multiple symptoms at once, replacement planning usually makes sense.

Symptom	What it often means	What to check first
Rusty or discolored hot water	Tank corrosion or failing dip tube	Inspect/replace the dip tube 100108608
Popping or rumbling	Sediment layer on tank bottom	Drain and flush tank; check drain valve operation
Water on the floor near heater	Fitting leak or tank leak	Inspect connections; test the water heater drain valve 100108361
Dripping from discharge pipe	Overpressure or overheating	Test the water heater temperature and pressure relief valve 100108279

Why it matters

Once a tank starts leaking internally, it typically cannot be repaired. Catching issues like a sticking drain valve, a weak T&P relief valve, or a failing dip tube early can prevent water damage and help your Kenmore gas water heater run safely and efficiently.

Last updated: February 2026

For a 50-gallon gas water heater like Kenmore model 153334450, average labor to install typically runs $400 to $1,000 for a straightforward replacement; costs go higher when venting, gas piping, permits, or code upgrades are needed.

What changes the labor price most

Labor varies mainly by how much work is required beyond swapping the tank.

• Venting changes (new vent pipe, chimney liner, power vent conversion)
• Gas line work (new shutoff, sediment trap, resizing, leak testing)
• Water piping updates (new shutoffs, dielectric unions, expansion tank)
• Permit and inspection requirements in your area
• Access and removal (tight closets, attic installs, stairs, haul-away)
• Safety/code items (drain pan, seismic straps, stand, combustion air)

Typical labor ranges (what you can expect)

These are common labor-only ranges for a 50-gallon gas water heater install.

Install scenario	Typical labor range	What it usually includes
Like-for-like replacement	$400 to $1,000	Disconnect, remove, set new heater, reconnect water and gas, basic startup checks
Moderate modifications	$900 to $1,600	Some piping changes, minor venting updates, added code items
Complex install	$1,600 to $2,500+	Significant venting or gas work, relocation, difficult access, multiple upgrades

Why it matters

Gas water heater installation is a safety-critical job. The labor cost often reflects the time needed to meet local code, verify safe venting and combustion, and confirm gas and water connections are leak-free.

Parts that are commonly replaced during an install

If your installer recommends replacing worn safety or service parts, these are common on gas water heaters:

• Water heater temperature and pressure relief valve 100108279 (safety valve; often replaced if old or leaking)
• Water heater drain valve 100108361 (helpful if the original is clogged or seeping)
• Pilot 100109070 or water heater pilot tube assembly 100108370 (only if ignition issues exist)

Last updated: February 2026

To estimate the age of your Kenmore 153334450 gas water heater, read the serial number on the rating label and decode it using the manufacturer’s date format (often year plus week or month). If the label is worn or hard to read, replacing the label is not required; you just need the serial clearly copied.

Where to find the serial number

On most Kenmore gas water heaters, the serial number is printed on the rating plate on the tank’s exterior.

Check these common spots:

• Upper side of the tank near the draft hood or flue
• Mid-tank area near warning labels
• Near the gas control valve area
• On a large rectangular label that also lists capacity and gas type

How serial number dating usually works

Kenmore-branded water heaters are commonly built by major manufacturers, and the serial format depends on who made the tank.

Typical patterns you may see:

• YYWW at the start (year, then week of year)
• MMYY at the start (month, then year)
• A letter code for month and/or year (letters repeat on a cycle)
• A longer serial where the first 2 to 4 characters carry the date

Quick pattern guide (what to look for)

What the serial starts with	Most likely meaning	Example of what it tells you
4 digits like 0120	Month/Year	January 2020 build
4 digits like 2315	Year/Week	2023, week 15
Letters then numbers	Letter-coded date	Month/year encoded by letters

Why it matters

Knowing the build date helps you plan maintenance and replacement. Most tank-style gas water heaters typically last 8 to 12 years, and age is a key factor when you’re troubleshooting issues like pilot outages, lukewarm water, or leaking.

If you’re troubleshooting at the same time

Age plus symptoms can point to the most likely repair path. These parts are commonly involved in “no hot water” or “pilot won’t stay lit” problems:

• Pilot 100109070
• Water heater pilot tube assembly 100108370
• Thermocouple (listed in the parts list for this model)

If you’re seeing dripping at the discharge pipe or pressure buildup concerns, also check:

• Water heater temperature and pressure relief valve 100108279

Last updated: February 2026

On a Kenmore 153334450 gas water heater, a thermocouple typically lasts 5 to 10 years. If your pilot won’t stay lit or the burner shuts off shortly after lighting, replacing the thermocouple is usually the most reliable fix.

Typical lifespan and what affects it

A thermocouple’s life depends on heat exposure and how clean the pilot flame burns.

• 5 to 10 years is typical for many gas water heaters
• Heavy use (frequent burner cycles) can shorten life
• Dust, lint, or soot around the burner can cause weak pilot flame and faster wear
• A misaligned pilot flame that does not fully heat the thermocouple can mimic a “bad” thermocouple
• Corrosion at the connection to the gas control valve can cause intermittent shutdowns

Quick checks before you replace it

Use these checks to confirm the symptom points to the thermocouple and not the pilot system.

• Verify the pilot flame is steady and blue (not lazy, yellow, or lifting)
• Make sure the pilot flame engulfs the thermocouple tip
• Inspect the thermocouple lead for kinks, burns, or looseness
• Tighten the thermocouple nut snugly at the gas control (do not overtighten)
• If the pilot will not stay lit, also inspect the pilot 100109070 and water heater pilot tube assembly 100108370

Common symptoms and likely causes

Symptom	Most common cause	What to do
Pilot lights but goes out when you release the button	Weak thermocouple signal	Replace thermocouple
Pilot will not stay lit and flame looks weak	Pilot restriction or air in line	Check pilot assembly and tubing
Burner shuts off randomly	Loose connection or failing thermocouple	Reseat connection; replace if recurring
Water is too hot or pressure builds	Control or safety issue	Check the water heater temperature and pressure relief valve 100108279 and have the system inspected

Why it matters

The thermocouple is a key safety device; it proves the pilot flame is present so gas can flow safely. When it weakens, the gas control shuts the pilot off, which stops hot water production and can cause repeated relighting.

Last updated: February 2026

The most common gas water heater problem is ignition related: the pilot will not stay lit or the burner will not fire, so you get little or no hot water. On Kenmore model 153334450, the usual causes are a dirty or failing pilot assembly, a restricted pilot tube, or a gas control issue.

Most common symptoms (and what they usually point to)

• Pilot lights but goes out when you release the knob: pilot assembly issue or gas control not holding
• Pilot will not light or flame is weak/yellow: dirty pilot or restricted pilot tube
• Water is warm, not hot: thermostat setting, burner not staying on, or sediment
• Rumbling or popping sounds: sediment buildup in the tank
• Water dripping from a pipe on the side/top: temperature and pressure relief valve opening

Quick checks we recommend first

• Confirm the gas shutoff valve is fully open.
• Ventilate the area; if you smell gas, stop and have the gas supply checked.
• Watch the pilot flame; it should be steady and strong at the burner.
• If the pilot is weak or won’t stay lit, service the pilot components.
• If you hear rumbling, flush the tank to reduce sediment.

Common problems and the parts that often fix them

Problem you see	Most likely area	Parts on this model page that often apply
Pilot will not light or is weak	Pilot assembly	Pilot 100109070
Pilot flame is unstable	Pilot tubing	Water heater pilot tube assembly 100108370
Water discharges from relief line	Safety relief	Water heater temperature and pressure relief valve 100108279
Slow leak at drain outlet	Drain fitting	Water heater drain valve 100108361

Why it matters

Pilot and ignition problems are the most common because they stop heating immediately and can look like a bigger failure. Fixing the pilot system first restores hot water fastest and helps prevent repeated shutdowns.

Last updated: February 2026