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Caleffi Z55S : Z-one Motorized Zone Valve 2-Way 3/4" Sweat 24V

Caleffi

MSRP: $278.00
Your Price:  $194.60
(You save $83.40 )
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SKU:
Z55S
UPC:
8016615635584
Condition:
New
Availability:
Ships in 1 Week
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Connection3/4" Sweat
Configuration2-Way
Flow Coefficient7.5 Cv
Electric Supply24 V AC
Fail PositionNormally Closed
Max Pressure300 psi

The Caleffi Z55S is a Z-one motorized zone valve, 2-way with 3/4" Sweat connections, 24V.

Best for zones larger than a thermo-electric head can drive.

Specifications sourced from Caleffi North America technical literature. Last reviewed July 2026.

Key Features

Motorized Zone Control

A motor-driven actuator positions the valve on a thermostat call, suited to larger zones than a thermo-electric head can drive.

Auxiliary End Switch

An auxiliary microswitch rated 0.4 A at 24 V confirms valve position for pump or boiler interlock.

Glycol Compatible

Rated for glycol solutions to 50 %, covering freeze-protected circuits.

Technical Specifications

Product TypeMotorized Zone Valve
Connection Size3/4"
Connection TypeSweat
Configuration2-Way
Fail PositionNormally Closed
Flow Coefficient (Cv)7.5
Maximum operating pressure300 psi
Medium temperature range32-240 °F
Electric supply24 V AC
Power consumption at full capacity7 VA
Auxiliary microswitch contact rating (24 V)0.4 A
Maximum glycol %50 %
Mediumwater, glycol solutions, vapor (max. 15 psi)
SeriesZ-one
Shipping Weight3.6 lb (approx.)

Documentation

PDF
Sell sheet
03556_NA
PDF
Submittal data
02917-4_NA

Frequently Asked Questions

What connection does Caleffi Z55S use?

It is supplied with 3/4" Sweat connections. Other sizes and connection styles in the range are listed under Related Products.

What supply voltage does Caleffi Z55S require?

Electric supply is 24 V AC, drawing 7 VA at full capacity.

What is the warranty on Caleffi Z55S?

Caleffi covers this product under its standard two-year limited warranty against defects in material and workmanship from the date of shipment. ZOT Supply is an authorized Caleffi distributor.

Caleffi 2-Year Limited Warranty. Caleffi North America warrants this product to be free from defects in material and workmanship for two years from the date of shipment, when installed and operated in accordance with published instructions. ZOT Supply is an authorized Caleffi distributor with fast nationwide and international shipping.
Product Type:
Motorized Zone Valve
Product Family:
Motorized Zone Valves
Series:
Z-one
Connection Type:
Sweat
Connection Size:
3/4 inch
Configuration:
2-Way
Fail Position:
Normally Closed
Flow Coefficient:
7.5 Cv
Electric Supply:
24 V AC
Max Operating Pressure:
300 psi
Medium Temperature Range:
32-240 deg F