These modulating water valves can be used for heating applications. It does have an heating element which means that the bulb temperature always must be higher than the valve body (power element). The valve opens at increasing bulb temperature. The bulb must be mounted pointing downwards up to horizontal. 90/210 F 4 15' CAP 15' ARM.; BULB DIM. 11/16 X 12-1/4";
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