00 Series Cast Iron Circulator Pumps

Taco 00 Series Cast Iron Cartridge Circulator Pumps are single-speed, wet-rotor, in-line hydronic circulators built on a cartridge-based design that eliminates the mechanical seal entirely. The 00 Series spans a flow range of 0 to 52 GPM and head range of 0 to 32 feet, covering residential to light commercial hydronic heating, radiant heating, chilled water cooling, and indirect water heating applications. Every pump in the Taco 00 Series cast iron lineup operates at a maximum working pressure of 125 PSI and handles fluid temperatures from 40°F to 230°F. The cartridge contains all moving parts, so a field rebuild means swapping one component rather than pulling the whole unit off the wall. Taco backs the entire 00 Series cast iron line with a full flange-to-flange three-year warranty. For contractors working on hydronic systems where reliability and fast serviceability are non-negotiable, Taco 00 Series Cast Iron Cartridge Circulator Pumps are a foundational specification choice.

Standard Single-Speed Cast Iron Circulators (006, 007, 008 Series)

The standard single-speed models, including the Taco 007-F5, are fixed-speed, direct-drive circulators designed for residential hydronic and radiant heating systems. The 007 series operates at 1/25 HP and covers flow ranges up to 16 GPM with a head range up to 10 feet. Typical applications include hydronic heating zones, hydro-air fan coils, indirect water heating, and chilled water cooling. The direct-drive design eliminates belts and pulleys, which reduces noise, lowers operating power, and cuts down on long-term mechanical wear.

High-Head / High-Flow Cast Iron Circulators (008, 009, 0011, 0014 Series)

High-head cast iron models address longer loop runs and higher-resistance systems where standard circulators can fall short. The Taco 008-F6 operates at 1/25 HP and handles flow up to 14 GPM at heads up to 16 feet, making it a fit for higher-resistance residential and light commercial systems. The Taco 0011-F4 reaches a flow range of 0 to 31 GPM and head range of 0 to 31 feet at 1/8 HP, targeting high-head and medium-flow applications in large residential and light commercial closed-loop hydronic heating and chilled water cooling. Maximum working pressure across these models holds at 125 PSI, and fluid temperature tolerance runs from 40°F to 230°F.

High-Velocity Cast Iron Circulators (009 Series)

The Taco 009-F5 is a high-velocity circulator engineered for high-head and low-flow applications, specifically hydronic heating, radiant heating, and systems with elevated pressure drop. Operating at 1/8 HP, the 009-F5 carries a field-serviceable, replaceable cartridge and a maintenance-free, self-lubricating design with no mechanical seal. The 009-F5 is also rated for wood boiler and furnace applications, as well as hydro-air fan coils. All 00 Series operational specs apply: 125 PSI max working pressure and fluid temperatures from 40°F to 230°F.

00 IFC Cast Iron Circulators (Integral Flow Check)

The 00 IFC series adds a factory-installed Integral Flow Check to the standard cartridge design. The Taco 007-F5-7IFC is a wet-rotor, single-stage cartridge circulator with an IFC that prevents reverse and gravity flow without a separate in-line check valve, reducing piping complexity and installed cost. The IFC is engineered to simplify zoning with multiple Taco 00 circulators by protecting against crossflow between zones. All 00 IFC cast iron models carry the same cartridge replaceability as standard 00 Series units, and the full flange-to-flange three-year warranty applies.

Variable Speed Cast Iron Circulators (00 VV Series)

The 00 Series variable speed models accept an externally generated analog voltage signal, either 0-10V DC, 2-10V DC, 0-20mA, or 4-20mA, to modulate pump speed in response to system demand. Flow range across the variable speed cast iron lineup runs 0 to 52 GPM with head ranges up to 35 feet, and HP ratings span 1/40 to 1/8. A Delta-T variant allows the circulator to automatically adjust output to match the system's target differential temperature, dialed in between 5°F and 50°F. Maximum working pressure on 006 through 008 series variable speed models is 125 PSI; 009 through 0014 series models are rated to 150 PSI.

Selecting the right Taco 00 Series Cast Iron Cartridge Circulator Pump starts with flow and head requirements. Run the system's hydraulic calculation first: determine GPM needed at design conditions, then calculate total circuit head loss. Match the result to the published performance curve for each model. Undersizing is the most common mistake, and it shows up as uneven heat distribution or zones that can't satisfy demand.

Once flow and head are established, consider whether the application calls for a standard single-speed, IFC, variable speed, or high-velocity model. Single-speed models cover the majority of residential hydronic and radiant heating installs. IFC models remove the need for separate in-line flow checks and simplify zoning piping when multiple circulators protect individual zones. Variable speed models make sense on larger systems or where a building management system needs to modulate flow against a pressure differential or Delta-T target.

Cast iron construction is the right call for closed-loop hydronic systems. For open-loop systems, domestic hot water recirculation, or applications involving potable water, consult Taco's bronze or stainless steel 00 Series variants rather than cast iron.

Connection size selection follows the piping configuration. Taco 00 Series cast iron circulators come in flanged connections ranging from 3/4" to 1-1/2", and select models include 3/4" sweat options. Confirm flange orientation and check whether the installation requires a standard or rotated flange configuration before specifying. Universal flange-to-flange dimensions across the 00 Series cast iron line simplify direct replacements. Maximum working pressure is 125 PSI across most cast iron models, so verify system pressure before specifying 00 Series units on higher-pressure commercial work.

FAQs

What applications are Taco 00 Series Cast Iron Circulator Pumps designed for?

Taco 00 Series Cast Iron Cartridge Circulator Pumps are designed primarily for closed-loop hydronic heating, radiant heating, chilled water cooling, hydro-air fan coils, indirect water heating, and wood boiler or furnace systems. Cast iron construction makes the 00 Series appropriate for closed-loop systems where fluid chemistry is controlled. Open-loop systems or domestic water applications call for Taco's bronze or stainless steel 00 Series models instead.

What is the maximum working pressure and temperature for Taco 00 Series cast iron circulators?

The maximum working pressure for most Taco 00 Series cast iron circulators is 125 PSI. Fluid temperature range runs from a minimum of 40°F to a maximum of 230°F on standard cast iron models. Some variable speed models in the 009 through 0014 range are rated to 150 PSI; confirm the spec sheet for the specific model when designing higher-pressure systems.

How does the replaceable cartridge design work on Taco 00 Series pumps?

The replaceable cartridge on Taco 00 Series Cast Iron Cartridge Circulator Pumps contains all of the circulator's moving parts in a single, removable assembly. Replacing the cartridge fully rebuilds the pump without removing it from the piping. The cartridge design also eliminates the mechanical seal entirely; the 00 Series uses a self-lubricating, wet-rotor design instead, which removes a common wear point and reduces long-term maintenance.

What is the difference between a standard Taco 007 and a Taco 007 IFC model?

The difference between the standard Taco 007-F5 and the Taco 007-F5-7IFC is the Integral Flow Check. The 007-F5-7IFC includes a factory-installed IFC that prevents reverse and gravity flow between hydronic zones without requiring a separate in-line check valve in the piping. The IFC reduces installed piping cost and simplifies zone wiring when multiple 00 Series circulators protect individual heating zones. The underlying circulator performance, cartridge design, and warranty terms are the same across both models.

What warranty does Taco offer on 00 Series cast iron circulator pumps?

Taco offers a full flange-to-flange three-year warranty on all 00 Series cast iron circulator pumps. The warranty covers the complete unit from flange to flange, not just the motor or cartridge assembly. Replacement cartridges are field-installable, so warranty service on most 00 Series cast iron models doesn't require pulling the circulator body from the system piping.