Honeywell Aquastat Controller, Breaks on Rise, 120 to 240 VAC/0.25 to 12 VDC, 130 to 270 degree Fahrenheit, 5.1 to 48 A, Horizontal/Vertical Mount, 3/8 x 2-7/8 inch Copper Bulb, Micro Switch Snap-Acting Switch
The Honeywell L4006E1067 is temperature limiting aquastat controller that is manually reset.