Models part 100110039 fits
Reads or limits temperature. A failed one can stop the heat or let it run too hot. Find your model number below before you order; the list is sorted by brand.
ECJ40AO Smith water heaterECLN40AO Smith water heaterECRS50AO Smith water heaterECS30AO Smith water heaterECS50AO Smith water heaterECT55AO Smith water heaterECT66AO Smith water heaterECT120AO Smith water heaterEach model's page names where its part numbers come from and the date they were checked. Amazon buttons open a search for the part number; we may earn a commission.