So happy to find this! We have an old house with baseboard heaters that don't run line voltage through the thermostat. The old one started to stick and we had to tap it every half hour when the house got hot because the relay stayed closed. Once we returned home after a few days out of town, and the house was literally fried. The heaters must have been running for hours! Obviously unacceptable. This is an exact match in performance but heavier. I assume it's more durable, at least the case is. Has been working flawlessly for almost a year.