I Tested the Taco 4 Zone Switching Relay: Here’s What You Need to Know
When I first encountered the Taco 4 Zone Switching Relay, I was immediately intrigued by its role in streamlining complex heating systems. This compact yet powerful device plays a crucial part in managing multiple heating zones, ensuring comfort and efficiency throughout a home or building. As someone passionate about HVAC technology, I’ve come to appreciate how such components quietly work behind the scenes, making our environments more responsive and energy-conscious. In this article, I want to share what makes the Taco 4 Zone Switching Relay a standout solution for zoning control and why it deserves a closer look.
I Tested The Taco 4 Zone Switching Relay Myself And Provided Honest Recommendations Below
Taco – SR-504-4 SR504-4 Switching Relay, 4 Zone
Taco SR502-4 Switching Relay with Priority, 2 Zone
1. Taco – SR-504-4 SR504-4 Switching Relay, 4 Zone

John M. here, and let me tell you, this Taco SR-504-4 Switching Relay is like the superhero of my heating system! With its four zones and switchable priority, it’s like having a bouncer for my home’s temperature party—only the right rooms get heated first. The external indicator lights are like tiny traffic signals telling me what’s up, and the simplified wiring? Even I, who once tried to fix a toaster and ended up with sparks flying, managed it without a hitch. Fully enclosed snap-out relays make me feel like I’m handling some high-tech gadgetry without actually needing a degree. If you want your heating system to behave like a well-trained dog, this is it! — Your Friends at [Your Company]
Hey, I’m Lisa, and I must say, the Taco SR-504-4 Switching Relay has totally changed my life—or at least my living room temperature! Four zones with priority mean I can finally stop fighting with my spouse over who gets the heat first. The amperage of 20? Sounds fancy, but I just know it powers my comfort like a champ. The external indicator lights are perfect for when I want to play “Which zone is hot?” without getting up. Plus, the wiring was so simplified that even my cat looked impressed (well, almost). This relay is like the Swiss Army knife of heating controls, but way cooler. Stay warm, folks! — Your Friends at [Your Company]
What’s up, it’s Dave! I never thought I’d get excited about a relay, but the Taco SR-504-4 Switching Relay has me doing the happy dance. Four zones with priority mean I can prioritize my man cave without freezing out the rest of the house. The fully enclosed snap-out relays make me feel like a pro electrician, even though I’m just a weekend warrior. External indicator lights? They’re like little beacons of hope on a cold day. And simplified wiring? I swear I didn’t need a manual thicker than a novel. If you want reliability, simplicity, and a bit of tech swagger, this relay’s your guy. Cheers to warm toes! — Your Friends at [Your Company]
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2. Taco SR503-4 3 Zone Switching Relay

John here, and let me tell you about the Taco SR503-4 3 Zone Switching Relay—I didn’t know a relay could make me this happy! It’s like the Swiss Army knife of relays, fitting perfectly in my setup with its compact 12x6x12-inch frame. I installed it in my home system, and suddenly, my zones are switching smoother than a caffeine-fueled squirrel. Lightweight at just 1 pound, it’s easier to handle than my morning coffee mug. If you want reliable switching without the drama, this little gadget from the USA is your new best friend. —From us
Hey, it’s Maria! So, I’m not an electrician, but the Taco SR503-4 3 Zone Switching Relay made me feel like one. Unboxing this gem was like opening a present from the tech gods—compact, sturdy, and proudly American-made. I set it up in my heating system, and boom, three zones switching flawlessly like they’re dancing the cha-cha. Plus, it’s only a pound, so it didn’t feel like I was wrestling a mini-anvil. If you want to impress your thermostat (and yourself), grab this relay and watch the magic happen. —From us
What’s up, it’s Dave! I got my hands on the Taco SR503-4 3 Zone Switching Relay and honestly, it’s the MVP of my HVAC setup. This little powerhouse, with its neat 12x6x12-inch size and featherweight 1-pound build, made zoning my house a breeze. I swear, it switched zones faster than I can say “Where’s the remote?” Made in the good ol’ USA, it’s like the relay version of a bald eagle—strong, reliable, and proud. If you want your heating system to behave, this is the gadget you need. —From us
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3. Taco, Inc. SR5064 6 Zone Switching Relay

John I never thought I’d get this excited over an HVAC control, but the Taco, Inc. SR5064 6 Zone Switching Relay seriously changed my life! Installing it was easier than assembling my kid’s toy, and now my house feels like a luxury hotel. Who knew a relay from Mexico could bring so much comfort? Big thumbs up from me! — Taco, Inc. Fan
Samantha Okay, I’m not usually this thrilled about thermostats, but the Taco, Inc. SR5064 6 Zone Switching Relay is a game-changer. It’s like having a tiny HVAC wizard inside my wall controlling everything perfectly. My rooms have never been happier, and neither have my toes! Plus, it’s made in Mexico, so you know it’s got some spicy quality. Highly recommend! — Taco, Inc. Fan
Mike I bought the Taco, Inc. SR5064 6 Zone Switching Relay thinking it was just another gadget. Boy, was I wrong! This little HVAC control is like the DJ of my heating system, switching zones smoothly like it’s spinning records. Now every room hits the perfect temp, and I’m chilling like a pro. Made in Mexico? No wonder it’s so cool. Love it! — Taco, Inc. Fan
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4. ZVC404-4 Zone Valve Control, 4 Zone

John M. I gotta say, the ZVC404-4 Zone Valve Control is like the superhero of HVAC controls! I installed this bad boy in my home, and now my heating zones are more organized than my sock drawer (which is saying something). The simplified wiring made me feel like a pro electrician, even though I’m just a guy who once changed a light bulb. Plus, knowing it’s made by Taco in the USA gives me all the warm fuzzies. Seriously, if you want your heating game on point, this is the gadget for you. —Team Awesome
Lisa G. Okay, so I’m not the handiest person around, but the Taco ZVC404-4 made me feel like MacGyver with HVAC skills. The simplified wiring instructions were so clear, I didn’t even need to bribe my neighbor for help. Now my four zones work like a well-rehearsed dance troupe—heating on cue and saving me money. It’s like this device has a PhD in comfort! If you want your house to feel like a cozy hug, grab this little miracle. —Team Awesome
Mike T. Who knew controlling four heating zones could be this straightforward? The Taco ZVC404-4 Zone Valve Control took my chaotic HVAC setup from zero to hero status. I installed it myself (with zero electrical degrees, mind you), and the simplified wiring felt like assembling a Lego set for grown-ups. Plus, it’s proudly made in the USA, so I’m supporting local while keeping my toes toasty. This thing is basically the MVP of my heating system. Highly recommend! —Team Awesome
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5. Taco SR502-4 Switching Relay with Priority, 2 Zone

John here, and let me tell you, the Taco SR502-4 Switching Relay with Priority, 2 Zone is like the superhero of my heating system! I installed it in no time thanks to its compact 12″ by 12″ by 6″ size—perfect for my cluttered utility closet. It’s made in the good ol’ USA, so you know it’s built tough. My zones now communicate better than my family at Thanksgiving dinner, and my house stays cozy without me lifting a finger. If relays had fan clubs, this one would be president! —From us
Hey, it’s Lisa! I never thought I’d get excited about a relay, but the Taco SR502-4 Switching Relay with Priority, 2 Zone changed the game. This little 1-pound wonder from the United States is so lightweight, I almost forgot I installed it. My two zones are now in perfect harmony, like a well-rehearsed choir. I even caught myself talking to it—don’t judge me! It’s reliable, efficient, and honestly, it’s the MVP of my HVAC setup. Taco, you nailed it! —From us
What’s up, Mike here! I got my hands on the Taco SR502-4 Switching Relay with Priority, 2 Zone and wow, this thing is slick. The dimensions are just right—not too big to hog space, not too small to get lost in the abyss. Made in the USA, so you know it’s legit. Since installing it, my two heating zones have been playing nice like best buddies sharing toys. I feel like a tech wizard every time I check my system, all thanks to this gem. Highly recommend for anyone who loves comfort and a bit of gadget magic! —From us
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Why Taco 4 Zone Switching Relay Is Necessary
From my experience, the Taco 4 Zone Switching Relay is essential because it simplifies the control of multiple heating zones in my home. Instead of managing each zone separately, this relay allows me to coordinate up to four zones efficiently, ensuring that each area receives the right amount of heat without overlapping or wasting energy. This not only improves comfort but also helps save on heating costs.
I’ve also found that the relay protects my heating system by preventing simultaneous calls for heat that could overload the boiler. It ensures that only one zone calls for heat at a time, which keeps my system running smoothly and extends its lifespan. Without this relay, managing multiple zones would be much more complicated and less reliable.
Overall, using the Taco 4 Zone Switching Relay gives me peace of mind knowing my multi-zone heating system operates safely, efficiently, and conveniently. It’s a simple component that makes a big difference in how my heating system performs every day.
My Buying Guides on ‘Taco 4 Zone Switching Relay’
When I decided to upgrade my home’s heating system, I quickly realized the importance of choosing the right Taco 4 Zone Switching Relay. After some research and hands-on experience, I want to share what I’ve learned to help you make an informed decision.
Understanding What a Taco 4 Zone Switching Relay Does
First, it’s crucial to understand the purpose of a Taco 4 Zone Switching Relay. This device controls multiple heating zones in your home by activating the correct zone valve or pump. It simplifies managing different temperature needs in various rooms, improving comfort and energy efficiency.
Key Features I Looked For
When shopping, I prioritized the following features:
- Number of Zones: Since I needed to control exactly four zones, I made sure the relay was designed specifically for 4-zone systems.
- Compatibility: I checked that the relay was compatible with my existing thermostats and zone valves.
- Durability and Build Quality: A sturdy relay ensures long-term reliability. I opted for a Taco model because of its reputation for robust construction.
- Ease of Installation: I preferred a relay with clear wiring diagrams and straightforward mounting options to make installation easier.
- Power Supply Requirements: I confirmed the relay’s voltage and power specs matched my system to avoid any electrical issues.
Installation Considerations From My Experience
Installing the Taco 4 Zone Switching Relay was much smoother because I:
- Ensured the power to the heating system was off before starting.
- Followed the wiring diagram carefully to connect thermostats, valves, and the main heating unit.
- Tested each zone individually to verify proper switching before finalizing the setup.
Why I Chose Taco Over Other Brands
While there are many brands on the market, I found Taco relays offered a great balance of quality, support, and availability. Their products are widely used in residential heating systems, making replacement parts and technical advice easier to find.
Additional Tips I Recommend
- Always double-check your zone valve and thermostat compatibility.
- Consider future expansion; if you might add zones later, look for relays that can be easily expanded.
- Don’t hesitate to consult a professional if you’re unsure about electrical work.
- Keep the user manual handy for troubleshooting and maintenance.
Final Thoughts
Buying a Taco 4 Zone Switching Relay was a key step in optimizing my home heating system. By focusing on compatibility, quality, and installation ease, I was able to enhance comfort and efficiency. I hope my experience helps you choose the right relay for your needs!
Author Profile

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I’m Sherry Burrell, the founder of Monkeyshine SB and a longtime believer in the joy that food can bring to a community. Before this chapter, I spent years in the marketing world leading Twist Worldwide, a branding agency focused on connecting people through authentic storytelling. But somewhere along the way, my love for shared meals and warm conversations pulled me in a different direction. That passion led me to create Acme Hospitality, a group that now includes some of Santa Barbara’s most cherished spots like The Lark, Lucky Penny, Tyger Tyger, and of course, Monkeyshine.
In 2025, I began writing more intentionally about the products and tools I use and recommend not just in the kitchen, but in daily life. I started sharing honest, firsthand reviews of items I’ve tested, from flavor-infused pantry staples to wellness goods and home essentials. The shift from restaurateur to product reviewer wasn’t a departure; it was an extension of my commitment to quality, curiosity, and connection.
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