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Four-Zone Switching Relay with Priority, 120 VAC Reviews

4.8 Rating 115 Reviews
I used this relay switch with the thermostat that I also ordered to control the circulation pump for my in-floor heating system that I constructed. Both had good instructions for a do-it-yourself person like me. Worked great right from the start when I first put it into operation 2 weeks ago now. Both great products.
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Posted 11 years ago
Great unit, very good price and the installation was a breeze. Thanks for the fast delivery. hopefully it will provide long service. Replacement was straightforward the mounting holes were in the same location and the configuration was otherwise identical to the old unit. I can't compare similar units from other manufacturers I have only had the Taco unit. I do like the led lights indicating which zone(s) are powered.
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Posted 11 years ago
This is to control various zone circulators with individual thermostats. It's easy to wire up, and dependable. LED lights show if a zone is calling for heat or not.
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Posted 11 years ago
Taco circulators and relay switch were quick and easy to find on the site, the price was great, speedy delivery, and installation is easy and well diagrammed.
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Posted 11 years ago
The SR503-4 3 zone switch appears to be a quality unit. No operational issues so far.
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Posted 11 years ago
Used on my replacement cold start boiler that had only one pump input on control board.
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Posted 12 years ago
Very slick panel. Makes entire installation look more professional.
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Posted 12 years ago
This controller gives me the feeling that my home heating needs are finally being met. My home has never been so comfortable, since I bought it with a Rube Goldberg type two-zone system.
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Posted 12 years ago