AO Smith ECS50 water heater Parts

Replacing a typical 50-gallon water heater usually runs about $700 to $3,100+ installed, depending on whether it’s electric or gas, local labor rates, and whether any plumbing, venting, or electrical upgrades are needed. For an Ao Smith ECS50 electric water heater, costs are often on the lower end when it’s a straightforward swap.

Typical cost breakdown (what you’re paying for)

• Water heater tank: often $500 to $3,000 (type and efficiency drive the price)
• Labor: commonly $150 to $1,000+ (simple replacement vs. complex install)
• Materials: shutoff valve, fittings, flex lines, expansion tank, drain pan, etc.
• Haul-away/disposal: sometimes included, sometimes a separate fee
• Permits/inspection (where required): varies by area

Electric vs. gas: what changes the price most

Replacement type	Typical installed cost range	Why it varies
Electric 50-gallon	$700 to $2,500	Usually simpler connections; may need electrical updates
Gas 50-gallon	$1,000 to $3,100+	Venting, gas piping, combustion air, and code requirements

Cost drivers that push the total higher

• Relocating the heater or changing the footprint
• New venting or vent modifications (gas units)
• Electrical work (new breaker, wiring, disconnect, or correcting unsafe connections)
• Plumbing corrections (old shutoff valve, corroded piping, no expansion tank where required)
• Access issues (tight closet, attic, crawlspace)

When a repair can be the better spend

If the tank is not leaking and you’re only losing hot water, a repair can restore performance for much less than a full replacement. Common ECS50 service parts we see customers replace include:

• Element 100108290 (heating element)
• Thermostat 100109846 (temperature control)
• Anode rod 100109624 (helps slow tank corrosion)

Why it matters

A “cheap” replacement can get expensive fast if the installer has to bring the setup up to code or correct unsafe wiring or plumbing. Pricing the job as a like-for-like swap versus an upgrade or relocation keeps estimates comparable.

You can order ECS50 replacement parts from the parts list for this model, or search by model number on Sears PartsDirect.

Last updated: February 2026

A 50-gallon electric water heater typically lasts 10 years. For an Ao Smith ECS50, regular maintenance and timely replacement of wear items (especially the anode rod and heating elements) helps you reach that full service life.

Typical lifespan and what changes it

Most 50-gallon electric tank water heaters land in a predictable range.

Situation	Typical lifespan	What you usually see
Normal household use	10 years	Gradual recovery-time slowdown
Hard water or heavy use	8 years	More sediment, noisier heating
Well-maintained unit	12 years	Fewer leaks, steadier hot water

Maintenance that extends life (and protects the tank)

These steps reduce corrosion and sediment buildup, which are the two biggest tank killers.

• Flush sediment from the tank periodically to keep heat transfer efficient.
• Inspect and replace the anode rod when it is heavily depleted; see anode rod 100109624.
• Check heating performance and replace a weak/burned element; see element 100108283 or element 100108290.
• Verify thermostat operation if temperatures swing or recovery is slow; see thermostat 100109846 or thermostat 100110039.
• Keep wiring protected by reinstalling covers after service; see terminal cover 100110879.

Signs your water heater is near end of life

When these show up together on an ECS50, replacement planning is smart.

• Rusty or metallic-smelling hot water
• Rumbling or popping sounds (sediment on the bottom)
• Hot water runs out faster than it used to
• Water around the base of the tank
• Frequent thermostat resets or inconsistent temperature

Why it matters

A water heater that is past its typical lifespan is more likely to leak and can waste electricity because sediment and failing elements make it work harder. Replacing the anode rod and keeping the elements and thermostats in good shape helps protect the tank itself.

Ordering the right parts

We recommend matching parts to your Ao Smith ECS50 model listing first. You can also search by model number on Sears PartsDirect if you are building a maintenance list.

Last updated: February 2026

Yes. Ao Smith electric water heaters like model ECS50 are a solid, mainstream choice; most owners get dependable hot water when the heater is installed correctly and maintained (especially the anode rod and heating elements). Like any brand, long-term reliability depends heavily on water quality, electrical supply, and routine service.

What “good” usually means for an electric water heater

We judge electric water heaters on a few practical factors that affect day-to-day performance:

• Recovery and hot water consistency (how quickly it reheats)
• Leak resistance (tank life and fitting integrity)
• Serviceability (how easy it is to replace common wear parts)
• Parts availability (elements, thermostats, covers)
• Operating cost (temperature setting and insulation efficiency)

Common issues and the parts that typically fix them

Many “bad water heater” complaints trace back to normal wear parts, not the tank itself.

Symptom	Most common cause	Parts on this model page that often apply
Not enough hot water	Burned-out element or mis-set thermostat	Element 100108283, thermostat 100109846
Water too hot or not hot enough	Thermostat out of calibration or failing	Thermostat 100110039
Rumbling, popping, slow heating	Sediment buildup on element	Element 100108290
Premature tank corrosion	Anode rod depleted	Anode rod 100109624

Maintenance that makes the biggest difference

These steps are what most homeowners can do (or have a technician do) to keep an ECS50-STYLE electric water heater running well:

• Test and set temperature to a safe, consistent level (many homes run around 120°F)
• Flush a few gallons periodically to reduce sediment
• Inspect wiring and terminals for heat damage and tight connections
• Replace the anode rod on schedule to protect the tank
• Check for small leaks early around fittings and access panels

Why it matters

Electric water heaters are simple machines; when performance drops, it is usually an element, thermostat, or corrosion protection issue. Staying ahead of those wear items is the difference between “mixed reviews” and years of steady hot water.

If you need replacements for your Ao Smith ECS50, we list model-matched parts here, and you can also search by model number on Sears PartsDirect.

Last updated: February 2026