Utilizing genuine OEM pool heater parts like the 800203B ensures that your header manifold assembly maintains its design-spec compression

preventing dangerous flue gas leaks and maintaining high-efficiency operation

Operational Efficiency: Eliminates the need for off-site testing

Efficient Operation: Delivers 3

It is technically identical to the Honeywell 4074ELR/U

Johnson Controls T-2100-205 Thermometer 30067439-890 Utilizing genuine OEM pool heaterJohnson Controls T 2100 205 Dial Thermometer, 40 to 240 Degree Temperature Scale, "B" Bulb Element, Flush Panel Mount, 15' Capillary Length, Stainless Steel Case, Vapor Filled Copper Element, "B" Style Elements Require a Minimum Insertion Length of 9 1 2"