1" Sweat 557 Heat Motor Zone Valve Zoom

1" Sweat 557 Heat Motor Zone Valve


Brand: Taco

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(5 Available)



Application: Zoning
Size: 1"
Connection Type: Sweat
Material: Bronze
Body Pattern: 2-Way
Hertz: 60
Flow Capacity (Cv): 7
Min Flow (GPM): 6
Max Flow (GPM): 10
Flow Range (GPM): 6-10 GPM
Max Temp (F): 240°F
Min Temp (F): 40°F
Temperature Range (F): 40°-240°F
Max Pressure (PSI): 125
Wiring: 3 Wire Terminal Block
Width (Inches): 3-5/8"
Height (Inches): 5.375
Depth (Inches): 2"
Pump Head Ft of Water: 150 Ft
End Switch: Yes
Position: Normally Open

Description for Taco 557-2

Taco's 550 Series heat motor zone valves are designed for high-head capacity applications such as high-rise residential and commercial buildings. Heavy-duty construction enables this series to operate up to 150 feet of pump head. They are available in 1/2" - 1" sweat connections.

Taco Heat Motor Zone Valves provide a convenient way to create individual zones or equipment isolation in a hydronic heating system. Utilizing one pump along with multiple zone valves, flow can be started, stopped, or diverted through the system to provide individual room or area comfort control and energy savings.


  • Proven Performance: Millions in Use. Taco Zone Valves are the Industry's Top Choice for Consistent Performance
  • Rugged Dependability
  • Silent Operation
  • Twist Off Head
  • Bellows or Globe Valve Construction Ensures Positive Shut-off and Leak Proof Operation
  • Patented Construction
  • Easy to Install
  • Manual Open (Bypass) Lever
  • 24 VAC Powered with Isolated End Switch
  • 100% Factory Tested
  • Made in the USA
  • 3 Year Head, 5 Year Body Warranty

1" Sweat 557 Heat Motor Zone Valve


by PowerReviews
Taco1" Sweat 557 Heat Motor Zone Valve

(based on 1 review)

Ratings Distribution

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  • 1 Stars



Reviewed by 1 customer

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Heat zone valves

By Do it yourselfer

from Southfield, Mi

Verified Buyer

Comments about 1" Sweat 557 Heat Motor Zone Valve:

I replaced existing (old) zone valves in my home heating system. The new valves were exact replacements for the Taco valves that were originally installed in the house (since 1965). I hope these last 50 years also.

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