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Six-Zone Switching Relay with Priority, 120 VAC Reviews

4.7 Rating 131 Reviews
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47,561
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Read Plumbing Supply and More Reviews
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Brian H
Verified Reviewer
“The transformer is undersized to fit in the box. Mine went out, so I bought another transformer — an industrial-grade one and put it in. It's working well for the past 3 weeks.”
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Posted 9 years ago
Melissa L
Verified Reviewer
“Replaced an old controller with this Taco SR504-EXP-4.”
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Posted 9 years ago
Mark K
Verified Reviewer
“FAST SHIPPING !!!”
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Posted 10 years ago
Laura D
Verified Reviewer
“Easy to install.really delivered, quick shipping!”
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Posted 10 years ago
Kimberly W
Verified Reviewer
“I have installed many radiant systems for myself and friends. I have never had one fail.”
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Posted 10 years ago
Russell C
Verified Reviewer
“The Taco switching relay was a great upgrade to my new boiler and DWH.”
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Posted 10 years ago
Joel T
Verified Reviewer
“Used this relay to stage 2 boilers from outdoor reset.”
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Posted 10 years ago
Robert P
Verified Reviewer
“This product looks better quality made than the 503 exp. version.”
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Posted 10 years ago
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