Product Overview

121-138 Series
In-Line Circulators
121-138 In-Line Cartridge
Design Pump Series:
Applications
Designed to efficiently circulate
heated or chilled water in large
residential and commercial
Hydronic Systems. Ideal for
primary-secondary systems, as
well as parallel pumping designs.
Available in Stainless Steel
construction for fresh water service.
Features
Proven Performance: In-Line
Cartridge Design Pumps are
backed by years of Taco experience
in design and manufacture of
circulators. Hundreds of
thousands are in service.
Dependable, Quiet Operation:
In-Line Cartridge Design Pumps
offer quiet dependable pumping
power and long lasting perfor-
mance. Ideal for heating and/or
air conditioning systems requiring
high head performance, pressure
boosting, and recirculation systems
with relatively low volume.
Unique Cartridge Design:
Replaceable “cooler running”
bearing cartridge extends
bearing life. With permanently
sealed grease lubricated ball
bearings it is virtually
maintenance free.
Built to Last
Cartridge Bearing Assembly
Cartridge design isolates the
bearings from the effects of
system fluid temperatures which
greatly extends bearing life.
• Alloy steel shaft
• Cupro-Nickel shaft sleeve
Mechanical Seal
• Two piece carbon/ceramic
seal is standard
• Sealide-C/viton available for high
temperature and aggressive
water applications
Body & Flanges
• Available in cast iron or 304SS
• In-Line configuration
• Companion flanges provided
in 2-1⁄2” or 3”
Impeller
• Dynamically and
hydraulically balanced
• Enclosed type – cast iron
or 304SS
Drive Coupling
• Rugged flexible rubber
construction absorbs angular
and parallel misalignment
Rugged Motor
• Available in single and three
phase, and all standard voltages
...open-drip proof enclosure
• Equipped with sleeve
bearings for quiet operation
• Resilient mounted
• Built-in overload protector
on single phase models
Factory Tested
• Every pump is built to Hydraulic
Institute standards and operated
before shipment
Easy Low-Cost Service
• No special tools required
• One cartridge bearing assembly
fits all models – replace cartridge
only . . . not bracket
• One mechanical seal
fits all models