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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. Triple aquastat burner control height 6 1/8 in depth 3 1/8 in width 4 1/3 in temp range 130 – 240 f differential 10 fixed full load amps 120v 7.4 Locked rotor amps 120v 44.4 Full load amps 240vac 3.7 Locked rotor amps 240v 22.2 24v burner control circuit burner control circuit 24v 1. 25 A horizontal or vertical mounting high limit includes tube of heat conductive compound and range stops.