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  • An immersion type liquid-filled sensing element actuates two snap switches.
  • One switch operates as a high limit control.
  • The other switch operates as a low limit and/or circulator control, depending on the model.
  • Controller may be mounted in any positioning and needs no leveling.
  • Separate, easy-to-read, calibrated dial and setpoint adjustments for each switch.
  • Differential adjustment on low limit or circulator switch.
  • All adjustments accessible inside front cover.
  • Push-in terminals for quick connecting.
  • Single sensing element for easy installation.
  • Two SPST snap switches act independently at respective temperature settings.

Product Specifications
  • Description: High Limit and Circulator Aquastat Controller with High limit : 10 F fixed; low limit: 10-25 F adj. differential
  • Application: High Limit and Circulator
  • Operating Range, Low Limit (F): 110 F to 220 F
  • Operating Range, Low Limit (C) : 43 C to 104 C
  • Operating Range, High Limit (F): 130 F to 240 F
  • Operating Range, High Limit (C): 54 C to 116 C
  • Differential Temperature (F): High limit : 10 F fixed; low limit: 10-25 F adj.
  • Switching Action: SPST: High Limit & Circulator
  • Electrical Ratings (AFL): 8A @ 120 Vac
  • Electrical Ratings (AFL): 5.1A @ 240 Vac
  • Electrical Ratings (ALR): 48A @ 120 Vac
  • Electrical Ratings (ALR): 30.6A @ 240 Vac
  • Electrical Ratings: 0.25 A @ 0.25 to 12 Vdc
  • Electrical Rating (ignition): Transformer
  • Load: 360 VA
  • Spud Size (in.): 3/4 in. - 14 NPT
  • Dimensions (in.): 3 7/8 in. high x 4 1/8 in. wide x 2 3/4 in. deep.
  • Dimensions (mm): 98 mm high x 105 mm wide x 70 mm deep.
  • Insulation Depth (in.): 1 1/2 in.
  • Insulation Depth (mm): 38 mm
  • Mounting: Horizontal
  • Operating Humidity Range (% RH): 0 to 95% RH,
  • Maximum Ambient Temperature (F): 150 F at switches; 265 F at sensing element
  • Maximum Ambient Temperature (C): 66 C at switches; 129 C at sensing element
  • Approvals, Underwriters Laboratories Inc UL Listed: File No. MP466, Vol. 12, Sec. 4, Guide No. MBPR2
  • Approvals, Canadian Standards Association Certified: File No. LR95329-1
Read more
Circulator Control
High Limit
Switch Action:
Well Spud Size:
3/4" to 14 NPT
Temperature Range (F):
130°F to 240°F
110°F to 220°F
Electrical Rating:
5.1A @ 240 Vac
8A @ 120 Vac
0.25 A @ 0.25 to 12 Vdc
Electrical Ratings (ALR):
48A @ 120 Vac
30.6A @ 240 Vac
Electric Ratings (Ignition):
Transformer Load: 360 VA
Max Temp Differential:
10° to 25°F (Low Limit)
Max Temp Differential:
Min Temp Differential:
Max Ambient Temp (°F):
150 F at Switches
265 F at Sensing Element
Depth (Inches):
Well Included:
Operating Humidity:
5% to 95% (non-condensing)
Min Temp (F):
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