00 Series Cast Iron Circulator Pumps

00 Series cast iron cartridge circulator pumps are hydronic circulators built for moving hot water through closed-loop heating systems. Cast iron models are typically used on boiler loops and closed hydronic circuits that circulate non-potable heating water. A cartridge-style circulator is designed around a serviceable internal assembly, which supports maintenance without replacing the full pump housing in many cases.

This 00 Series cast iron category covers common Taco circulator models used for baseboard heat, radiant loops, fan coil circuits, and indirect water heater piping.

A broader view of hydronic circulators across brands and materials is available under Circulator Pumps at:
https://www.supplyhouse.com/Pumps-Flanges-288000

How to narrow the right 00 Series pump fast

Start with the system requirement, then match the pump curve.
Pump selection starts with required flow and required head based on loop length, pipe size, fittings, zoning, and heat emitter layout. The right circulator is the one that hits the design point on the curve.

Use the spec filters to narrow quickly.
This category supports narrowing by horsepower, max flow (GPM), max head (ft), and voltage. Typical options in the filters range from fractional horsepower values like 1/25 HP up through larger options, max flow values from 10 to 30 GPM, and max head values from the high single digits up into the teens. Voltage options include common hydronic voltages like 115V and 120V, plus higher voltage options such as 208V and 230V.

Match the piping plan with flanges and service-friendly isolation.
Most circulator installs are cleaner when the pump can be isolated for service without draining the full system.

Pump Flanges are at:
https://www.supplyhouse.com/Pump-Flanges-1836000

Isolation Valve Flanges, which combine isolation and flange connection in one fitting style, are at:
https://www.supplyhouse.com/Isolation-Valve-Flanges-27470000

Confirm the material fits the application.
Cast iron is a strong default for closed-loop heating water. For applications that call for stainless construction, compare against 00 Series Stainless Steel Cartridge Circulator Pumps at:

https://www.supplyhouse.com/00-Series-Stainless-Steel-Cartridge-Circulator-Pumps-26910000

Decide on efficiency and control strategy.
A standard fixed-speed circulator fits many straightforward loops. For upgrades where ECM style circulation is being considered, Taco High Efficiency Pumps are at:

https://www.supplyhouse.com/Taco-High-Efficiency-Pumps-34882000

Common add-ons that make circulator installs easier

Air removal keeps circulation stable and quiet.
Air Eliminators:
https://www.supplyhouse.com/Air-Eliminators-310000

Pressure stability protects the loop.
Extrol Expansion Tanks for Hydronic Heating:
https://www.supplyhouse.com/Extrol-Expansion-Tanks-for-Hydronic-Heating-277000

Zoning hardware influences pump strategy.
Zone Valves:
https://www.supplyhouse.com/Zone-Valves-21340000

Zone Valve Controls:
https://www.supplyhouse.com/Zone-Valve-Controls-22610000

FAQs

What does “cartridge circulator” mean?
A cartridge circulator uses a cartridge-style internal assembly. The design supports service work on the internal components without requiring replacement of the full pump housing in many configurations.

Where do cast iron cartridge circulators typically get used?
Cast iron circulators are commonly used on closed-loop hydronic heating systems that circulate non-potable heating water, such as boiler loops, baseboard heat, and radiant heating circuits.

How is the right Taco 00 Series circulator selected?
Selection is based on required flow at required head. The correct model is the one that hits the design point on the pump curve for the system layout, not the one that feels close by naming.

Do 00 Series circulator installs typically use flanges?
Many installs use pump flanges and isolation hardware so the circulator can be serviced without draining the whole system.

Pump Flanges are at:
https://www.supplyhouse.com/Pump-Flanges-1836000

Isolation Valve Flanges are at:
https://www.supplyhouse.com/Isolation-Valve-Flanges-27470000

When does stainless steel make more sense than cast iron?
Stainless construction is often considered when system conditions or fluid requirements call for it.

00 Series Stainless Steel Cartridge Circulator Pumps are at:
https://www.supplyhouse.com/00-Series-Stainless-Steel-Cartridge-Circulator-Pumps-26910000

What other components often get paired with a circulator replacement?
Air eliminators and expansion tanks are common companion items in hydronic systems.

Air Eliminators are at:
https://www.supplyhouse.com/Air-Eliminators-310000

Extrol Expansion Tanks for Hydronic Heating are at:
https://www.supplyhouse.com/Extrol-Expansion-Tanks-for-Hydronic-Heating-277000