Aquastat is designed to thermostatically turn any B&G NBF circulator ON and OFF. The AQ-1/2 or AQ-3/4 will switch the pump OFF at 120°F (48.9°C) and ON at 100°F (37.8°C). The aquastats are available in separate models that will sense the temperature for either 1/2” or 3/4” copper pipe.

AUTOMATIC TIMER KIT and AQUASTAT COMBINATION – The automatic timer and aquastat kits can be used in combination. When they are used together, the pump will only circulate water when the ON time conditions are met and when water temperature is low enough to cause the aquastat to switch ON.

Features and Benefits

Thermostatic Switch Modes: OFF (open) at 120°F (48.9°C) water temperature and ON (closed) at 100°F (37.8°C) water temperature.
Thermostatic Element: Bimetal, senses surface temperature of outside diameter of pipe.
Pipe Size: AQS-1/2 clips onto 1/2″ copper pipe or 3/8″ steel pipe (OD of pipe 5/8″). AQS-3/4 clips onto 3/4″ copper pipe or 1/2″ steel pipe (OD of pipe 7/8″).

Mounting: May be installed to sense temperature at the suction or discharge pipe of the pump.
Thermostat Covering: Epoxy (Environmentally Sealed)
Pipe Clip: Stainless Steel
Sensing Element: Bimetal
Wire Leads: Insulated 18″ (457mm) #18 AWG
UL approved.
Connects to the lead wires in the connection box of any Bell & Gossett NBF/NRF/SSF circulator.
Suitable for 115/120V, 60 HZ operation.
Provides thermostat control to the circulator. It will turn OFF (open) at 120°F (48.9°C) water temperature and ON (closed) at 100°F (37.8°C) water temperature.

General Selection Tools:

  • ESP-PLUS for B&G Centrifugal Pumps, Booster Pumps, Pump Accessories, and Air Separator
  • ESP-PARTS for replacement parts selection
  • ESP-TANKS for replacement parts selection
  • CAD Drawings for 2D and 3D dimensional drawings in many formats

Heat Exchanger Product Selection

Steam + Water Pressure Reducing Values

Sizing Tools:

Report Bugs/Request Enhancements
Please email the following address to report issues and request enhancements:

Consult your local Bell & Gossett Representative for additional assistance.

Xylem Water Systems Australia Pty. Ltd
Unit 3/1 Federation Way,
Chifley Business Park
3194 Mentone Victoria
Tel. +61 3-95517333
Fax +61 3-95510321
Australia Distributors

Brown Brothers Engineers
50 Nestor Drive
Meadowbrook QLD 4131
Phone:07 3200 6488
Fax:07 3200 3822
New South Wales and Australian Capital Territory
Brown Brothers Engineers
211-215 Walters Rd
Arndell Park NSW 2148
Phone:02 9671 3666
Fax:02 9671 3644
Victoria and Tasmania
Brown Brothers Engineers
8 Damien Court
Dandenong Vic 3175
Phone:03 9793 9999
Fax:03 9793 0022
Western Australia
Advanced Pump Technologies
72 May Holman Drive
Bassendean WA 6054
Ph: 08 6143 1000
Fx: 08 6143 1009
South Australia and Northern Territory
WBS Pumps
6A Lasalle Street
Dudley Park SA 5008
Phone:08 8344 9927
Fax:08 8344 9925
New Zealand Distributors
Christchurch (head office)
Brown Brothers Engineers
197 Durham Street
Christchurch 8011
New Zealand
Phone: 3 365 0279
Fax: 3 366 6616
Brown Brothers Engineers
10 Timaru Street
Dunedin 9012
New Zeland
Phone: 3 456 2562
Fax: 3 456 2564
Brown Brothers Engineers
Unit 6/39 North Street
Timaru 7910
New Zealand
Phone: 3 683 1686
Fax: 3 683 1687
Brown Brothers Engineers
124A Hugo Johnston Drive
Penrose, Auckland 1061
New Zealand
Phone: 9 525 8282
Fax: 9 525 8284
Brown Brothers Engineers
97C Norton Road
Frankton, Hamilton 3204
New Zeland
Phone: 7 847 5280
Fax: 7 847 1580
Brown Brothers Engineers
9 Aglionby Street
Lower Hutt, Wellington 5010
New Zealand
Phone: 4 570 1500
Fax: 4 570 1499