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The Taco Switching Relay is the best choice for all your zoning needs, with advanced Power Port Cards, external diagnostic lights, switchable priority and contractor friendly PC board layouts. Combined with the time proven reliability of the "00" family of circulators and thermostats, total system integration is achieved.
From the Manufacturer
Taco Switching Relays combine clearly-labeled PC board layouts with advanced features that allow you to completely customize your system. And whether you're using basic priority switching, Taco Plug-In PowerPort Cards or add-on power controls, tailoring the system has never been easier. External indicator lights give you instant diagnostic feedback, making service calls or new installation start-ups a snap. All switching relays are UL listed, use standard "ice cube" replaceable relays and are compatible with conventional and programmable thermostats. For larger jobs, switching relays can be expanded up to 20 zones with priority. With the exclusive Taco PowerPort Plug-In Cards, you can easily add such features as post purge, priority protection and pump exercise. Any expandable switching relay can also interface with the Boiler Reset Control and Injection Mixing Add-On Power Controls. Mix-and-match as needed to customize the system.
roger
August 14, 2025
Excellent product, well built and great instruction. Will definitely recommend this product.
Rafael A. Cartagena
July 12, 2025
Needed this to convert an old line voltage thermostat to a new low voltage smart thermostat and it worked great. Easy to install ad great value.
Brew Time
June 1, 2025
I already had a 6 zone Taco relay that was being fully utilized so I purchased this unit to add an additional heating zone. The item is simple to wire and is working well. My only complaint is that it makes a slight humming sound which is audible in the room above my boiler.
tom la france
May 21, 2025
Rewired my geothermal scene. This is the temporary one.
Scully0007
April 25, 2025
We needed this to go between a new Lathem time clock and an existing bell system. We couldn’t understand how to install it so we had to call the electrician who sorted it out.Once installed it’s worked perfectly.
jana Sivers
April 1, 2025
Made our in floor heat a simple install easy to wire and hook up
Randy B.
March 25, 2025
This product is exactly what i needed to make ny radiant heating boiler system function correctly and not kill my zone pump.
Trymax400
February 14, 2025
Thought it was the one with metal housing as the photos indicated at my time of purchase. Sadly it is the new plastic one and won't mach my existing system; if I had the time I would return it. This kind of thing really pisses me off here: though I am sure it will work fine these are rock solid.
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