W-250-IS-T Automatic Grease Interceptor with Precision Timer


How A Grease Trap Works

*Units may ship with dark or light gray lids

Click here to see video about Big Dipper's key features!


The Big Dipper W-250-IS-T Automatic Grease Removal Device is rated to ASME A112.14.3 and A112.14.4 standards and is capable of accepting up to a 25 GPM (1.58 l/s) flow while holding more than 56.4 lbs. (25.6 kg) of grease.  The center module which comes with digital time control, heater assembly, and mechanized skimming assembly, automatically isolates trapped grease into grease collector for easy disposal.
  • Fully automatic self cleaning cycle. Actively removes collected grease & oils from tank without any operator assistance. Comes complete with precision timer interface and Grease Collector.
  • Constructed of corrosion resistant materials suitable for installation in virtually any location.
  • Integrated Motor/Grease Outlet/Heater/Lid enables a fast, do-it-yourself unit operation reversal.
  • Compact footprint.
  • Two (2) No-Hub Connectors provided.
  • 1 Year Warranty on electrical components


Exterior: Rotationally Molded Polyethylene
Interior: Rotationally Molded Polyethylene

Electrical:  115 VAC, 50/60 Hz, 1173 Watts (10.2 Amps)*

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

Number of Skimming Wheels:  1

Skimming Rate:  9 Pounds Per Hour (4.08 Kg Per Hour)

Grease Retention Capacity:  56.4 Pounds (25.6 Kg)

Internal Solids Strainer Capacity:  1.85 Gallons (7 L)

Product Weight:  48 Pounds (21.7 Kg)

Thermaco Big Dipper Model No. W-250-IS-T, rotationally molded polyethylene tank automatic self-cleaning grease and oil recovery separator(s) for floor mounted or partially recessed installation, rated to ASME A112.14.3 and/or PDI-G 101 standards at 25 gallons per minute (1.58 liters per second) peak flow with 56.4 Pounds (25.6 Kg) of grease capacity and including as an integral part of the unit, 2” (50 mm) inlet/outlet, 1 rotating gear oleophilic/hydrophobic skimming wheel assembly for automatic grease/oil removal, flow control device, self-regulating electric immersion heater with thermostatic control, 1” (25mm) vessel vent, integral gas trap, digital control for programmable operation, field reversible motor assembly and grease/oil sump outlet, quick release stainless steel lid clamps, fully removable polymer lid with magnetic lid tensioners, internal polymer/stainless steel strainer basket for collection of coarse solids, polymer wiper blade unit and a separate gasketted removable grease and oils collection container with carry handle and pouring spout. 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. Two (2) no-hub connectors for plumbing connection provided.

*Electrical Variations

W-250-IS-T: 115V 50/60Hz, 1173 Watts (10.2 Amps)
W-250-IS-T-E: 230V 50/60Hz, 1173 Watts (5.1 Amps)

Unit may also be listed as W250IST, W-250IST, W250-IS-T, W-250-T, W250T, 250-IS-T or 250IST














Icon Label Description Type Size Download
Big Dipper Maintenance Poster Big Dipper Maintenance Poster pdf 690.9 KB Download
W-250-IS-T Spec Sheet pdf 1.1 MB Download
MNL-51000-Essential pdf 2.2 MB Download