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A. O. Smith

Reliance 9000509-045 Single Element Electric Thermostat

  • Based on 137 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Hearthshire
Arrives Sunday, May 3
Order within 23 hours and 30 minutes
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Features

  • Thermostat
  • For Use With Single Element Electric Water Heaters
  • Brand Name: Ao Smith
  • Model Number: 9000509-045

Description

Reliance 9000509-045 Single Element Electric Thermostat From the Manufacturer Single element electric water heater thermostat

Brand: A. O. Smith


Model Name: Reliance 9000509-045 Single Element Electric Thermostat


Controller Type: Touch Control


Special Feature: Temperature Display


Color: Black


Controller Type: Touch Control


Additional Features: Temperature Display


Specific Uses For Product: Single Element Electric Water Heaters


Temperature Control Type: Digital


Connectivity Technology: Wired


Power Source: Corded Electric


Voltage: 240 Volts


Display Type: LED


Control Type: Touch Control


Control Method: Touch


Connectivity Protocol: BACnet MS/TP


Mounting Type: Wall Mount


Backlight: No


Color: Black


Shape: Rectangular


Material Type: Plastic


Brand Name: A. O. Smith


Model Name: Reliance 9000509-045 Single Element Electric Thermostat


Included Components: Reliance 9000509-045 Single Element Electric Thermostat


Model Number: 9000509-045


UPC: 020363105488


Global Trade Identification Number: 88


Manufacturer: Reliance


Item Type Name: Reliance 9000509-045 Single Element Electric Thermostat


Unit Count: 1.0 Count


Manufacturer Warranty Description: Warranty.


Item Weight: 0.3 Pounds


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, May 3

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Perfect replacement
Product was as described, easy to install, wired it in, has been working like a charm. I’m very thorough in my work, it only took about 15, 20 minutes.
Reviewed in the United States on June 26, 2025 by Matty F
    • Works perfect
Easy to install. TURN OFF POWER first! Just a few wires and it was done.
Reviewed in the United States on January 23, 2024 by Marc Gartner
    • Replacement thermostat on Sears water heater works fine.
As described. Identical (same mfg and part number) to the original Sears thermostat. Included the clear plastic safety cover. The temperature control knob is shorter than original, and requires small screw driver to adjust. Could not use a push-in wire connect as the square washers were omitted. Just curved the wire around the screws to connect. Has been working OK. ... show more
Reviewed in the United States on October 2, 2014 by Ed
    • Exelente
Exelente
Reviewed in the United States on January 2, 2026 by No pude purgarla en ningun momento salio la grasa estuve 1 hora intentandola
    • Fits properly
Fits a single element manufactured home 30 gallon water heater
Reviewed in the United States on May 3, 2025 by tjoutdoors
    • Works great
My hot water heater was overheating regardless of setting, and I was afraid I might have to replace the whole heater. Turned out I just had to replace the thermostat with this inexpensive replacement. It was a simple matter of screwing the 3 wires into the same place on the replacement. NOTE: TURN OFF THE POWER TO THE HOT WATER HEATER BEFORE REPLACING...unless you want to be electrocuted. Use a multimeter to ensure there's no power running before you start. Now my hot water heater is running just fine, and I'm glad it didn't cost much to fix. Before you order, make sure the unit number matches what's required in your heater's manual. ... show more
Reviewed in the United States on May 12, 2014 by Nati
    • Work better than the factory one the tank was only two months old
Review Image by William a.Jones Sr.
All good!!!!
Reviewed in the United States on March 14, 2023 by William a.Jones Sr.
    • When it's hort it's hot
This one regulates perfectly, easy to install and water temp is close to marked scale. The identical one that came on the new Reliance tank was flawed, at full temp the water was just 95 and replacement under warranty was a was a brick wall.
Reviewed in the United States on December 31, 2016 by Sr Citizen

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