Can you replace a thermostat on an electric water heater?
Yes. On the Kenmore 153327564 power miser 8+ electric water heater, you can replace a thermostat if it is faulty or not regulating temperature correctly. The key is to shut off power first, keep the thermostat flush to the tank, reinstall the terminal cover, and replace insulation before restoring power.
Electric water heaters use high voltage; we follow the same safety steps every time.
- Turn OFF power at the breaker and confirm power is off before touching wiring.
- Never energize the heater until the tank is completely full of water.
- Keep the thermostat flush against the tank for accurate sensing.
- Make sure the terminal cover is installed and locked.
- Replace the insulation block and the access panel before turning power back on.
Use the procedure and wiring diagram in the owner's manual.
- Turn off electrical power at the junction box/breaker.
- Remove the access panel; pull back insulation to expose the thermostat.
- Remove the thermostat terminal cover (it is held by plastic locking tabs).
- Move wires to the new thermostat one at a time; tighten terminal screws firmly.
- Reinstall the terminal cover, insulation block, and access panel.
- After the tank is full and water flows from a hot faucet, restore power.
If you are replacing the thermostat, these model-matched parts are often involved:
| What it is | When it matters | Model-matched part |
|---|---|---|
| Upper thermostat | No heat, overheating, or erratic temperature | Thermostat 100108683 |
| Thermostat bracket | Thermostat will not sit tight/flush | Water heater thermostat bracket 100108380 |
| Thermostat cover | Missing/damaged protective cover | Kenmore elite water heater thermostat cover 100108743 |
Most households run best around 120°F to reduce scald risk and energy use. If you adjust temperature, use a screwdriver on the slotted adjustment and keep settings reasonable (upper thermostat typically does not need adjustment).
A loose connection, missing terminal cover, or missing insulation can cause unsafe operation and unreliable temperature control. Tight terminals and proper reassembly help prevent overheating and electrical damage.
Last updated: February 2026
How to tell if an electric water heater element is bad?
A bad heating element in your Kenmore 153327564 electric water heater usually shows up as no hot water, not enough hot water, or a breaker that trips during heating. We confirm it by safely shutting off power, then testing the element for an open circuit or a short to ground; the owner's manual also stresses turning power OFF before servicing.
- No hot water at all (especially after normal recovery time)
- Lukewarm water or hot water runs out quickly
- Breaker or fuse trips when the heater tries to heat
- You recently had a leak at the element area (gasket issue can mimic element failure)
- You had very hot water, then suddenly no hot water (high-limit may have tripped)
- Turn OFF the water heater breaker (electrical shock hazard).
- Remove the access panel and fold back insulation.
- Verify power is off with a meter.
- Disconnect the element wires.
- Measure resistance across the two element screws:
- Infinite/OL: element is open (bad)
- A steady ohms reading: element is likely intact
- Check for a short to ground: one probe on an element screw, the other on the metal tank. Any continuity indicates a grounded element (bad).
| Element wattage | Typical ohms range | What it means |
|---|---|---|
| 3800W | ~14 to 16 Ω | Normal range for many 3800W elements |
| 4500W | ~12 to 13 Ω | Normal range for many 4500W elements |
| 5500W | ~10 to 11 Ω | Normal range for many 5500W elements |
- This model uses 240V elements; the manual notes an upper 3800W element and that the lower element can be converted from 3800W to 5500W on a 240V system.
- If you suspect a leak at the element, reseating or replacing the gasket is a common fix; the water heater heating element gasket 100108379 is the correct gasket listed for this model.
A grounded or open element can stop heating, trip the breaker, and lead to repeated resets. Testing first prevents replacing thermostats or wiring unnecessarily.
Last updated: February 2026
What is the longest lasting electric water heater?
The longest-lasting electric water heaters are models built with corrosion-resistant tanks and well-protected heating elements; in real homes, lifespan is driven most by water chemistry, maintenance, and correct temperature settings. For your Kenmore Power Miser 9+ model 153327564, follow the maintenance and safety guidance in the owner's manual to maximize service life.
Electric water heaters typically last 10 to 15 years. Units last longer when the tank resists corrosion and sediment is kept under control.
Big factors that extend life:
- Consistent maintenance (periodic draining to reduce sediment)
- Correct thermostat settings (avoids overheating and stress)
- A working temperature-pressure relief valve
- Tight, clean electrical connections under the access panels
- Prompt repair of leaks at valves, elements, or gaskets
Use this quick checklist when you are comparing electric water heater longevity.
| Durability feature | Why it matters | What to check |
|---|---|---|
| Tank corrosion protection | Prevents tank failure | Anode rod design and tank lining type |
| Element and gasket design | Reduces leak risk at elements | Correct thread size and proper gasket fit |
| Serviceable controls | Prevents overheating and nuisance trips | Thermostat and high-limit availability |
| Drain valve quality | Makes maintenance easier | Valve material and ease of operation |
Your Kenmore 153327564 uses specific element and control components called out in the parts list; matching the correct parts helps prevent leaks and overheating.
Common longevity-related replacements on this model include:
- Thermostat 100108683 (temperature control and high-limit function)
- Water heater heating element gasket 100108379 (helps prevent element-area leaks)
- Ao smith water heater drain valve 100108605 (supports easier draining and maintenance)
When an electric water heater fails early, the cause is usually tank corrosion, heavy sediment buildup, or overheating from control issues. Keeping the thermostat and drain components in good shape is one of the most practical ways to extend the life of a Kenmore Power Miser 9+ water heater.
Last updated: February 2026
What's the difference between a 4500 watt and a 5500 watt hot water heater?
A 5500-watt electric water heater heats water faster than a 4500-watt unit, so recovery after showers is quicker. The tradeoff is higher electrical demand; 5500W draws more amps and commonly requires a 240V circuit sized for a 30-amp load with 10 AWG copper wiring.
Kenmore model 153327564 uses a conventional upper element rated at 3800 watts (on 240V). The lower element is factory-installed as a convertible element that can operate at 3800 watts or 5500 watts on a 240V system. The conversion requirements (240V supply, 10 AWG wiring, and 30-amp overcurrent protection) are listed in the owner's manual.
- Faster recovery time after heavy hot-water use
- More back-to-back hot water availability (showers, laundry)
- Higher current draw, so wiring and breaker sizing matter more
- More heat at the element, so tight, clean electrical connections are critical
- No change in tank capacity; wattage affects reheating speed, not gallons stored
| Wattage | Approx. amps | Common circuit setup |
|---|---|---|
| 4500W | ~18.8A | 240V, often 25A to 30A breaker (per code) |
| 5500W | ~22.9A | 240V, 30A breaker, 10 AWG copper |
If the circuit is undersized, you can get nuisance breaker trips and overheated wiring or terminals. Matching wattage to the existing electrical supply protects the heater and keeps recovery performance consistent.
If you are diagnosing slow heating or temperature swings, these parts are commonly involved:
- Thermostat 100108683 (upper thermostat)
- Water heater thermostat bracket 100108380 (helps hold thermostat in proper contact)
- Kenmore elite water heater thermostat cover 100108743 (covers and protects the thermostat area)
Last updated: February 2026





