Aquastat Controller, 40 - 180 F
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High or Low Limit/SPSTThese models break the circuit on temp. rise. When used as a controller or a low limit, a separate high limit must be used. Hydronic ControlsThese immersion controllers for use in gas- or oil-fired hydronic heating systems require a 24VAC thermostat. Select models are compatible with 750mV thermostats.