If you want to test your old one before purchasing this just take it out and follow these 2 steps:
1. When it's warmed up check for continuity between the 2 wires with a multi-meter. There shouldn't be any.
2. Drop the thermostat into a glass of ice water for several minutes and check again. There should be continuity.
If you get readings other than this the unit is bad and needs replaced. Just because you hear it click when it gets below 30 degrees (plus or minus a few degrees), doesn't mean the thermostat is good.
I hope this review helps :)
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