Caleffi ZSR104 Z-One 4-Zone Expandable Switching Relay for Circulator Pumps with Priority, 120VAC

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Caleffi ZSR104 Z-One 4-Zone Expandable Switching Relay for Circulator Pumps with Priority, 120VAC

Name: Caleffi ZSR104 Z-One 4-Zone Expandable Switching Relay for Circulator Pumps with Priority, 120VAC
Brand: Caleffi
SKU: CALE-ZSR104
Price: 281.99 USD
Availability: InStock

CaleffiSKU: CALE-ZSR104

Price:

$281.99

Stock:

Re-stocking soon

Quantity:

Special order — typically ships in 1–3 weeks.
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Shipping details

Shipping weight: 3.2 lb
Box size: 12.8 × 12.4 × 3.4 in

Type	Zone Pump Controls

The Caleffi ZSR104 Z-One is a 4-zone switching relay that controls circulator pumps in a zoned hydronic heating system, with priority and 120VAC input.

Each thermostat call starts the matching zone circulator and sends a heat demand to the boiler. The priority function lets one zone, typically indirect domestic hot water, take precedence over the others. The control is expandable for systems that need more zones, and each pump circuit is rated at 5 amps. The enclosure measures 9.25" high x 11" wide x 3" deep.

Before ordering, confirm the number of zones (4) and that each circulator draws no more than 5 amps. Use the installation manual to plan thermostat and expansion wiring.