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Three-Zone Switching Relay, 120 VAC Reviews

4.8 Rating 97 Reviews
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
Very easy to understand installation directions, works exactly as described, everything contained in 1 compact unit.
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Posted 11 years ago
Used it to run heat pumps on a new hot water boiler. Works great.
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Posted 12 years ago
Works good.
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Posted 12 years ago
This switching relay was a breeze to install. I replaced a pair of Honeywell mechanical contacts and ended up putting in a third zone for a 4-loop radiant heat zone. Great price, great products. Taco makes top-of-the-line equipment.they has great prices and service, way better than going to a local .
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Posted 12 years ago
Simple hook up.
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Posted 13 years ago
Needed a controller as I was adding another heating zone as well as indirect water heating. Checked around for what was available and decided on this model. Worked great, very easy to install and prices were great.
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Posted 13 years ago
First time installing, easy to wire, straightforward and it works great. I like the lights that tell you what zone is running at a glance. I mounted mine away from the boiler on the chimney at eye level.
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Posted 13 years ago