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Caleffi ZSR103 : Z-one 3-Zone Pump Relay

Caleffi ZSR103 : Z-one 3-Zone Pump Relay

Caleffi

MSRP: $289.00
Your Price:  $193.49
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SKU:
ZSR103
UPC:
8016615438116
Condition:
New
Availability:
Ships in 1 Week
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Electric Supply120 V (AC)
Warranty3-Year Limited

The Caleffi ZSR103 is a Z-one 3-zone circulator control relay.

Best for coordinating multiple zones, circulators and the heat source from one enclosure.

Specifications transcribed from Caleffi North America published technical literature. Last verified August 2026.

Warranty

Caleffi 3-Year Limited Warranty. Caleffi North America warrants this product free from defects in material and workmanship for three years from the date of transfer of ownership - the point Caleffi hands the goods to the first carrier - subject to correct installation and use. Coverage runs to the purchaser identified as "Ship To" on Caleffi's order confirmation and is subject to the eligibility conditions, exclusions and remedies set out in Caleffi North America's published Limited Warranty and Terms and Conditions of Sale. This summary is provided for convenience and does not replace those documents.

Key Features

Circulator Switching

Switches 3 zone circulators from thermostat calls, so each zone pump runs only when its zone is calling.

Boiler Interlock

Provides the end-switch contact so the heat source fires only when at least one circulator is running.

Technical Specifications

Product TypeZone Control Relay
Electric supply120 V (AC)
SeriesZ-one Pump Control

Documentation

PDF
PDF
PDF
PDF
Sell sheet
03619_NA

Design Resources

PDF
Idronics
Idronics_14_NA_Controlling_hydronic_systems

Related Products

Frequently Asked Questions

What does Caleffi ZSR103 control?

It is a zone pump control relay. It switches 3 zone circulator(s) from thermostat calls and provides the boiler interlock so the heat source fires only when a circulator is running.

Can Caleffi ZSR103 drive zone valves instead?

No. This board switches circulators. Caleffi's ZVR series is the equivalent board for zone valve actuators, which have a different load and end-switch arrangement.

What supply voltage does Caleffi ZSR103 require?

Electric supply is 120 V (AC).

Caleffi 3-Year Limited Warranty. Caleffi North America warrants this product to be free from defects in material and workmanship for three years from the date of transfer of ownership (when the goods are handed to the first carrier), when installed and operated in accordance with published instructions. Coverage runs to the purchaser identified as "Ship To" on Caleffi's order confirmation and is subject to the eligibility conditions, exclusions and remedies set out in Caleffi North America's published Limited Warranty and Terms and Conditions of Sale. This summary is provided for convenience and does not replace those documents. ZOT Supply is an authorized Caleffi distributor.
Product Type:
Zone Control Relay
Product Family:
Z-one Zone Controls
Series:
Z-one Pump Control
Zones:
3
Electric Supply:
120 V (AC)
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