Original Hurlcon Minimax Thermostat PCB. No Display. Has Spade Terminal connections. Very uncommon. From the 1990s. These have been obsolete for over 15 years and there is no direct replacement. Part number 70275 (spade style). Do not confuse with 70275AN or 70275HX.
We can retrofit another style PCB into these heater, but only if the heater is brought to us, or we visit.
In many cases, it is simply more economical to replace the heater.