For gas or oil-fired storage water heaters rated between 200,000 and 730,000 BTU/hr, choose the 1" No. 40, 140 or 240 Series.
For gas or oil-fired hot water supply boilers rated over 730,000 BTU/Hr output heating domestic water and for steam coil storage water heaters, choose the No. 340 or 342 Series.

Special Model No. 340X-8 M4Z available in 1/2"" size only. Pressure setting 175 psi; Temperature 210°F; Certified by AGA only.

Specifications
Temperature relief 210°F. Standard pressure settings 75, 100, 125 and 150 psi. Size 3/4"" and 1"" No. 40, 140 Model M12 thermostats use thermo-bonded (non-metallic) protective coating to retard accumulation of mineral deposits created by hard water conditions. Size 1"" and above sizes of Models M13, M2 and M4 incorporate a stainless steel thermostat tube."

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