Tommy Mac Discussions › Forums › Fix-it Forum: Home Improvement & Do It Yourself Repair Forum › boiler aquastat voltage question › The One That Fixed Furnace
If the 24 volt didn’t work and the millivolt did then I would think the millivolt was the right one. Ask sears what the right part is for that model. A millivolt creates it’s own electricity for when you don’t have a transformer to reduce the 110 down. Millivolt thermostats are different also.