W-250-AST Automatic Grease Removal Device


New and updated Big Dipper AST Model!

In order to make it easier to protect sewer systems from grease, we have been working on improving our Big Dipper AST model. Now featuring Advanced Odor Protection, the new Big Dipper AST is easier to install and maintain.

The Big Dipper W-250-AST Automatic Grease Removal Device is capable of accepting up to a 25 GPM (1.58 l/s) flow. The center module which comes with digital time control, heater assembly, and mechanized skimming assemble, automatically isolates trapped grease into grease collector for easy disposal. The Automatic Solids Transfer feature automatically empties incidental solids out of the solids chamber and down the sewer line.
  • Fully automatic self cleaning cycle. Removes collected grease & oils from tank without any operator assistance. Comes complete with digital control interface and Grease Collector.
  • Constructed of corrosion resistant materials suitable for installation in virtually any location. Attractive sanitary Stainless Steel exterior.
  • Integrated Motor/Grease Outlet/Heater/Lid enables a fast, do-it-yourself unit operation reversal.
  • Compact footprint.
  • Two (2) No-Hub Connectors provided.


Exterior: 304 Stainless Steel, Bright Finish
Interior: Rotationally Molded Polyethylene

Electrical:  115 VAC, 50/60 Hz, 1400 Watts (12.2 Amps)*

Maximum Inlet Flow Rate:  25 GPM (1.58 l/s)

Number of Skimming Wheels:  1

Skimming Rate:  20 Pounds Per Hour (9.08 Kg Per Hour)

Grease Retention Capacity:  73.29 Pounds (33 Kg)

Thermaco Big Dipper Model No. W-250-AST, bright finish type 304 stainless steel exterior, rotationally molded polyethylene interior automatic self-cleaning grease and oil recovery separator(s) for floor mounted or partially recessed installation, rated at 25 gallons per minute (1.58 l/s) peak flow, 73.29 pounds (33 Kg) of grease capacity and including as an integral part of the unit, 1 rotating gear hydrophobic wheel assembly for automatic grease/oil removal, an integral flow control device, self-regulating enclosed electric immersion heater, a vessel vent, an integral gas trap, an integral programmable 24-hour multi-event time control, a field reversible motor location, a field reversible grease/oil sump outlet, quick release stainless steel lid clamps, a gasketted and fully removable polymer lid with magnetic lid tensioners, lift-out filter basket access, an eductor transfer pump controlled by repeat cycle timer, and a separate grease and oils collection container. Electric assembly shall be tested to comply with pertinent sections of the Standards for Safety ANSI/UL 73 and/or ANSI/UL 1004. Electric motor equipped with overload protection.

*Electrical Variations

W-250-AST: 115V 50/60Hz, 1400 Watts (12.2 Amps)
W-250-AST-E: 230V 50/60Hz, 1400 Watts (6.1 Amps)

Unit may be also be listed as W250AST, W-250AST, W250-AST, W-250, W250, 250-AST or 250AST

Icon Label Description Type Size Download
W-250-AST 51K Specification Sheet W-250-AST 51K Specification Sheet pdf 847.4 KB Download
W-250-AST 51K Installation & Operation Manual W-250-AST Installation & Operation Manual pdf 2.3 MB Download

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