Models part 100109846 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.
ECLN40AO Smith water heaterECRS50AO Smith water heaterECRT52AO 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.