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Aquastat® Controllers are immersion type devices for limiting or regulating the temperature of liquids in boilers, storage tanks, and other applications where temperature control is required.


  • Remote temperature sensing element detects and responds rapidly to temperature changes.
  • Totally enclosed Micro Switch™ snap-acting switch.
  • Visible control point scale and external adjustment screw permit easy setting.
  • Available horizontal or vertical mounting of the remote element into boiler, tank, or other container.
  • Case mounts to a vertical surface.

Product Specifications

Hazmat Information
UN 1294, TOLUENE, 3, II
Two-stage Aquastat Controller to cycle two-stage gas valve
Dimensions (in.)
Case--5 5/8 in. high x 2 in. wide x 2 1/8 in. deep
Dimensions (mm)
Case--143 mm high x 51 mm wide x 54 mm deep
Temperature Range (F)
Maximum--150 F
Temperature Range (C)
Maximum--66 C
Horizontal or Vertical
Electrical Ratings
Millivolt--0.25 A @ 0.25 to 12 Vdc; At Full Load-- 8A @ 120 Vac: 5.1A @ 240 Vac: 4.2A @ 277 Vac; At Locked Rotor-- 48A @ 120 Vac: 30.6A @ 240 Vac: 25.2A @ 277 Vac
Approvals, Underwriters Laboratories Inc.
UL Component Recognized: File No. E4436, Vol. 6, Sec.13, Guide No. XAPX
Approvals, Canadian Standards Association
Certified: File No. LR95329-1
Operating Temperature Range (F)
130 F to 230 F
Operating Temperature Range (C)
54 C to 110 C
Bulb Size (in.)
3/8 in. x 2 7/8 in. copper
Bulb Size (mm)
10 mm x 73 mm copper
Switching Action
2 SPDT switches
Approvals, American Gas Association
AGA Certified
Well Spud Size (in.)
1/2 in. - 14 NPT; 3/4 in. - 14 NPT
Well Spud Size (mm)
13 mm - 14 NPT; 19 mm - 14 NPT
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