Taco 133 Series 100 Cast Iron Circulating Pump 3/4HP

Circulate closed-loop HVAC water with Taco 133 Series 100 cast-iron pump for high-flow commercial hydronic systems. Its 3/4 HP single-phase motor accepts 115 or 230 volts, runs at 1,725 RPM, and provides up to 110 GPM with 42 feet of head. The universal flange accepts 3/4-inch through 1-1/2-inch connections. Confirm the selected flange and system curve before installation.

The Taco 133 uses a cast-iron ASTM A48 Class 30 casing, non-metallic polymer impeller, hardened alloy-steel shaft, and two-piece carbon/ceramic seal. Its ODP motor is oil-lubricated and uses spring-coupled direct drive with Babbitt-lined sleeve bearings. Automatic reset overload protects the motor. The supplied data also lists 125 psi pressure, 240°F maximum temperature, 8-1/2-inch length, and 38 pounds dry weight.

Key Features & Benefits

• 3/4 HP Motor: Supports high-flow closed-loop commercial hydronic circulation.
• 115/230-Volt Service: Provides single-phase flexibility after field verification.
• 110 GPM Maximum Flow: Gives contractors a stated capacity reference.
• 42 Feet Maximum Head: Helps compare piping resistance and elevation requirements.
• Universal Two-Bolt Flange: Accepts listed 3/4-inch through 1-1/2-inch connection sizes.
• Automatic Reset Overload: Provides listed motor protection.
• 8-1/2-Inch Flange-to-Flange Length: Helps verify replacement fit.
• 38-Pound Dry Weight: Assists handling and pipe-support planning.

Why Choose Taco 133

The Taco 133 combines universal flange sizing with high-flow performance and single-phase voltage options. It suits commercial hydronic systems where the existing pipe size and electrical supply require flexibility.

• Build: Cast iron, polymer, hardened alloy steel, and carbon/ceramic components define the assembly.
• Value: Universal flange sizing can reduce connection changes during replacement.
• Audience: Fits HVAC contractors, boiler technicians, facility engineers, and commercial maintenance teams.

Applications & Use Cases

Use this pump in high-flow closed-loop systems within the listed 110 GPM and 42-foot limits. Check the selected flange size, 8-1/2-inch length, pipe supports, valve clearance, oiling access, and 38-pound handling requirement. Keep fluid between 40°F and 240°F and pressure below 125 psi.

Warranty & Support

• Warranty Terms: Taco warranty duration and coverage for this Series 100 configuration require confirmation under current terms.
• Coverage Review: Confirm seal coverage, oiling requirements, installation conditions, exclusions, and claim procedures before purchase.
• Model Verification: Match Taco 133, 3/4 HP, single-phase configuration, and SKU 133 to the seller’s order documentation.

Verify voltage, choose the correct flange size, check oil condition, purge air, inspect strainers, and check for leaks during startup. Purchase the Taco 133 Series 100 cast-iron circulating pump at Mulmotor.com for genuine equipment, applicable warranty coverage, and pump support.