WH9, Lower Thermostat, Electric, 100108421

I was having issues with my State Industries (AO) water heater where I was having temperature fluctuations where some periods would be normal temperature (115-120) and other times tepid (95-105). Both heating elements had a good ohm measurement, but I decided to go ahead and replace both top and bottom heating elements and both upper and lower thermostats. After servicing my water heater, I have had consistent 115-120 temperatures. Been going 3 months and no issues yet. As long as the tank itself isn't compromised, I'm going to see how long I can keep the water heater in service. The replacement can be a little tricky for first timers, in particular removing the old thermostat from the clip mechanism. Be sure to take a picture of the wires before swapping the thermostat so you reconnect the water heater properly. Shut of power at the circuit breaker and verify with a non-contact voltage tester before working on disconnecting the wires. Also, use some masking tape to hold the insulation out of the way while you work. Kudos to supplyhouse.com for their one-stop selection of all my water heater parts. Would definitely buy from again!

I purchased this OEM unit because it snaps right into my AO Smith water heater. This is the second time I have replaced it in 3 years. If this one fails I will find another brand that will fit since this is the third set on this water heater. Both times the unit loses it's snap-action ability and gets real sloppy until there is 30-40 degrees of deadband between turning on and turning off. This eventually causes the top unit to trip on high temp.