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Weil McLain 511-405-113 Cartridge Circulator

Weil McLain 511-405-113 Cartridge Circulator

Weil McLain

The Weil McLain 511-405-113 Cartridge Circulator is the standard Taco service circulator that Weil McLain lists for its hydronic boilers: the Taco 007-F5, a flanged, wet-rotor, cast-iron cartridge circulator that keeps hot water moving through the heating loop. The pump is a 1/25 HP unit that runs on 115 V, 60 Hz power, draws 0.74 A and turns at 3250 RPM. It is a small, quiet motor built to run for long stretches without much power draw, which is exactly what a boiler circulator is asked to do all heating season. If you are searching by the Taco number 007-F5 or the Weil McLain number 511-405-113, this is the pump behind both.

The nameplate on this circulator is the information a tech wants in hand at the boiler. It is rated for 125 PSI maximum working pressure and 230°F (110°C) maximum water temperature, and it is impedance protected, continuous duty, enclosed to Type 2 and wound with Class H insulation. Impedance protection means the motor is designed so that a locked rotor does not cook the windings, which is a welcome safety margin on a pump that lives in a hot mechanical room. Because the 007-F5 is a wet-rotor design, the rotor and bearings run in the system water, and that water lubricates and cools them. There is no mechanical shaft seal to weep and no oil port to maintain, but it also means the pump must never be run dry. Purge the air out of the loop at startup and let the water do its job.

Weil McLain addresses the interchange question directly in service bulletin MB1907. The bulletin states that the 511-405-153 (the Taco 007e ECM circulator) can be used interchangeably with the standard 511-405-113 on these boilers: CGa-25, CGa-3, CGa-4, CGa-5, CGi-25, CGi-3, CGi-4, CGi-5, all CGt models, Ultra 80, Ultra 105, Ultra Oil 3E, Ultra Oil 4E, WGO-2, WGO-3, WGO-4, WTGO-3, WTGO-3L and WTGO-4. Performance between the two is similar but not exact, and on the CGa, CGi, WGO and WTGO boilers the change applies only to part numbers that currently include a circulator. Larger boiler sizes that are not on that list stay with the standard Taco 007.

Key Benefits

  • Factory Service Number: 511-405-113 is the Weil McLain service number for the standard Taco 007-F5, so you can order against the same number the factory uses.
  • Wet-Rotor, Quiet Running: Water-lubricated rotor and bearings with no shaft seal to leak, built for continuous duty on a hydronic heating loop.
  • Ratings On The Nameplate: 125 PSI working pressure and 230°F water temperature are printed right on the pump, with a Class H insulation system behind them.
  • Documented Interchange: Weil McLain bulletin MB1907 names the ECM-driven 511-405-153 as an interchangeable option on the boilers it lists.

Common Questions

  • What Taco model is the 511-405-113? It is the Taco 007-F5 cartridge circulator. The label on the pump reads CARTRIDGE CIRCULATOR 007-F5, and Weil McLain uses 511-405-113 as its service number for it.
  • What is the difference between the 007-F5 and the -8IFC version? The -8IFC version of the 007-F5 has an internal flow check and rotated flanges. If the pump on your boiler has the flow check built in, identify that before you order, and contact our team to confirm the match.
  • Can the 511-405-153 ECM circulator be used in its place? On the boilers named in Weil McLain bulletin MB1907, yes. The bulletin says the 511-405-153 can be used interchangeably with the 511-405-113, with similar but not exact performance.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.