Taco SR501 Single Zone Switching Relay - $40 (Woburn)

Taco SR501 Single Zone Switching Relay 1

Taco SR501 Single Zone Switching Relay 1 thumbnail

condition: good

make / manufacturer: Taco

model name / number: SR501

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I replaced the entire system. The cover has glue stains, but the zone relay was still in use and in good working order. The new boiler that had a bult-in it one so no need for this anymore.

Taco SR501 1-Zone Switching Relay for hydronic heating systems with 1 circulator pump.
This unit was removed from a fully functioning system during a boiler upgrade. The new boiler has built-in zoning, so this relay is no longer needed — not removed because of failure.
✅ Used but fully operational
✅ Controls up to 1 circulator zone
✅ Taco quality — simple, reliable, no nonsense
✅ Great replacement or backup for existing Taco systems
Perfect if you’re replacing a failed relay and don’t feel like paying full retail for a brand-new one.
💰 Price: $40

New units go for significantly more.

📍 Local pickup preferred.
💵 Cash / PayPal accepted.

Price is firm and based on current retail. Low offers will be ignored.

post id: 7903675197

posted: 2025-12-20 13:42

updated: 2025-12-21 01:58

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Taco SR501 Single Zone Switching Relay - household items - by owner...

I replaced the entire system. The cover has glue stains, but the zone relay was still in use and in good working order. The new boiler that had a bult-in it one so no need for this anymore. Taco...