Wilo 4190420 3-speed Cast Iron Circulator Pump 1/12 Hp

Product Description

The WILO 4190420 is a three-speed, wet-rotor circulator pump designed for hydronic heating and cooling systems in residential and light commercial applications. Rated at 1/12 HP and operating on 115 volts single phase, it delivers a maximum flow of 38 GPM and a maximum head of 33 feet. The cast iron body handles hot-water heating, chilled-water, and general industrial circulation service. A flanged connection with the flange oriented perpendicular to the shaft simplifies inline installation. Licensed plumbers and HVAC technicians are the primary installers of this pump in closed-loop piping systems.

This circulator is suited for hot-water heating systems of all types, cold-water systems, air-conditioning hydronic loops, and industrial circulation applications. The three-speed selection allows the installer to match flow rate to system demand without additional controls. The flanged body accepts standard 3/4 inch to 1-1/2 inch two-bolt flange connections in the standard orientation, making it a straightforward retrofit or new-installation choice for typical residential and light commercial hydronic circuits.

Key Features

• Three selectable speeds for field-adjustable flow matching
• Wet-rotor design eliminates the need for external shaft seals or lubrication
• Cast iron body rated for hot-water heating, chilled-water, and industrial circulation service
• Flanged connection (flange perpendicular to shaft) for straightforward inline piping
• Accepts 3/4 inch to 1-1/2 inch two-bolt flange fittings in standard orientation
• Maximum flow of 38 GPM and maximum head of 33 feet for mid-range hydronic circuits

Compatibility

Designed as an OEM-style replacement or new-installation circulator for residential and light commercial hydronic heating and cooling systems requiring a 115-volt, single-phase, flanged wet-rotor pump.

Installation Notes

Installation should be performed by a licensed plumber or HVAC technician in accordance with applicable local mechanical codes. Shut off and drain the system, and de-energize the circuit at the breaker before removing the existing pump or making any piping connections. Verify flange bolt pattern and gasket seating before pressurizing the loop. Do not operate the pump dry, as the wet-rotor design relies on system fluid for bearing lubrication and cooling.