AO Smith ECL50 water heater Parts

Most A. O. Smith electric tank water heaters like model ECL50 last 8 to 12 years. With consistent maintenance (especially protecting the tank from corrosion and sediment), many units reach the upper end of that range.

Typical lifespan and what affects it

A tank-style electric water heater’s life is mainly driven by water quality, temperature settings, and how well the tank is protected from corrosion.

• Hard water and heavy sediment shorten element and tank life
• Higher thermostat settings increase wear and scale buildup
• Infrequent anode rod replacement speeds up tank corrosion
• Leaks at fittings or the tank bottom usually signal end-of-life
• Regular flushing helps reduce sediment-related overheating

Maintenance that extends life (most impact for the cost)

These are the most effective, practical steps for an ECL50-STYLE electric water heater:

• Check and replace the anode rod on schedule; it is the tank’s primary corrosion protection
• Flush a few gallons from the drain periodically to reduce sediment
• Keep temperature at a safe, moderate setting (many homes run around 120°F)
• If hot water is inconsistent, test thermostats and heating elements before assuming the tank is failing
• Inspect access covers and wiring for heat damage or loose connections (power off first)

Maintenance item	Why it matters	Common interval
Anode rod	Prevents tank rust-through	About every 3 to 5 years
Sediment flush	Reduces scale and overheating	1 to 2 times per year
Thermostat check	Prevents overheating and poor recovery	As needed

Parts that commonly relate to lifespan problems

If you are trying to keep your ECL50 running longer, these parts are often involved in “no hot water,” “not enough hot water,” or slow recovery complaints:

• Anode rod 100109624
• Reliance water heater heating element, upper 100108327
• Thermostat 100109846

Why it matters

A failing anode rod or heavy sediment can make the heater work harder, overheat elements, and accelerate tank corrosion. Staying ahead of those issues is the most reliable way to hit the full expected lifespan.

Last updated: February 2026

For a 50-gallon electric water heater like the Ao Smith ECL50, average labor to remove and replace the tank typically runs $200 to $600 for a straightforward swap. Labor often rises to $400 to $1,000+ when electrical, plumbing, or code-related upgrades are needed.

What usually changes the labor price

Labor varies most based on access, electrical work, and whether the install is a simple like-for-like replacement.

• Location and access: attic, crawlspace, tight closet, or stairs increase time
• Electrical scope: new breaker, wiring, disconnect, or correcting unsafe connections
• Plumbing changes: shutoff replacement, pipe rework, new fittings, leak repairs
• Code items: expansion tank, seismic strapping, drain pan, T&P discharge piping updates
• Permits and inspection: adds admin time and scheduling
• Haul-away: old tank removal and disposal can be a separate line item

Typical labor scenarios (quick comparison)

Install scenario	What it includes	Common labor range
Straight swap	Same size, same location, existing wiring and piping	$200 to $600
Moderate complexity	Minor pipe changes, new shutoff, improved T&P drain line	$400 to $900
Complex job	Relocation, major electrical work, difficult access, multiple code upgrades	$800 to $1,000+

How to get an accurate quote (and avoid surprises)

Use this checklist when comparing bids for an ECL50 replacement.

• Confirm the quote includes disconnecting power, draining, and safe startup
• Ask whether permit/inspection is included or separate
• Verify haul-away of the old heater is included
• Ask what code upgrades are assumed (pan, expansion tank, seismic straps, T&P piping)
• Confirm whether the installer will test for proper voltage and thermostat operation

Why it matters

Electric water heater installs look simple, but the labor cost jumps fast when the job requires electrical corrections or code upgrades. Getting those items priced up front helps prevent delays, leaks, or nuisance tripping after installation.

If you are also budgeting for common maintenance parts that affect performance and longevity, check the anode rod 100109624 for the ECL50.

Last updated: February 2026

The most common water heater problem is loss of hot water or reduced hot water output, usually caused by sediment buildup and normal wear on electric heating controls. On an Ao Smith ECL50 electric water heater, the most common fix paths involve checking the thermostats and heating elements, then addressing maintenance items like flushing and anode condition.

Most common symptoms (and what they usually point to)

• Not enough hot water: failed thermostat, failed heating element, or heavy sediment
• No hot water: tripped breaker, failed thermostat, failed element, or loose wiring
• Rumbling or popping noises: sediment buildup on the bottom of the tank
• Water too hot or temperature swings: thermostat out of calibration or failing
• Rusty or metallic-smelling hot water: anode rod depleted
• Water around the heater: leaking plumbing connection or tank leak

Quick checks we recommend first (electric models)

1. Confirm the circuit breaker is on and the heater has power.
2. If you suspect an electrical issue, shut off power and use a meter to verify voltage and continuity.
3. Inspect wiring for heat damage under the terminal cover.
4. If hot water is limited, plan a tank flush to remove sediment.

Common causes and the parts that often solve them

Problem you notice	Most common cause	Part that’s often involved (ECL50)
No hot water	Upper control not switching power correctly	Thermostat 100109846
Not enough hot water	Lower control or element not heating	Thermostat 100110039 or reliance water heater heating element, upper 100108327
Rusty hot water	Anode rod worn out	Anode rod 100109624
Lukewarm water fast	Cold water not directed to bottom	Dip tube 100108611

Why it matters

Sediment and worn electrical controls make the heater run longer, waste energy, and deliver less hot water. Catching a weak thermostat, heating element, dip tube, or anode rod early helps restore performance and can extend tank life.

Last updated: February 2026

Replacing a 50-gallon electric water heater like the Ao Smith ECL50 typically costs about $1,200 to $3,500 installed (unit, labor, and common materials). The biggest price drivers are labor rates, whether the install needs code upgrades, and any plumbing or electrical changes.

What’s included in “replacement cost”

Most replacement quotes bundle these items:

• New 50-gallon electric tank water heater
• Removal and disposal of the old tank
• Basic plumbing connections (hot, cold, T&P discharge line tie-in)
• Electrical reconnection (existing circuit)
• Startup, leak check, and temperature setting

Common add-ons that raise the price

These are the items that most often push the total higher:

• New shutoff valve or supply piping changes
• Expansion tank (often required depending on your plumbing system)
• New or corrected T&P discharge piping
• Electrical updates (disconnect, wiring, breaker sizing)
• Permit and inspection fees
• Pan and drain line (especially in finished spaces)

Typical cost ranges (quick guide)

Scenario	What it usually means	Typical installed range
Straight swap	Same size, same location, minimal changes	$1,200 to $2,200
Moderate updates	Some plumbing or electrical corrections	$1,800 to $2,900
Relocation or major upgrades	Moving the heater, significant rework	$2,500 to $3,500

Why it matters

A 50-gallon electric water heater is a high-draw appliance; correct electrical connections, safe temperature settings, and proper T&P discharge piping help prevent nuisance shutdowns, leaks, and premature tank failure.

When a repair makes more sense than full replacement

If your tank is not leaking, a few common parts can restore hot water and extend service life:

• If hot water is weak or runs out fast, check the reliance water heater heating element, upper 100108327.
• If water temperature is inconsistent, a failed thermostat is common (this model lists thermostat 100109846 and thermostat 100110039).
• If you want to slow tank corrosion, replacing the anode rod 100109624 is a standard maintenance step.

Last updated: February 2026