Review on Taco SR503 4 Zone Relay for Enhanced Switching and Control by Patrick Ross

I installed a product to run a dual zone heating system with two Grundfos variable speed circulators. The system will be tested soon. I hope this works as it took a lot of work to install the plumbing, wiring and general handyman and love work. It's basically a do-it-yourself project. There is some risk in buying online, making it yourself and failing during peak heating season. Wait, fingers crossed, connect and pray and believe in online shopping, technology and all work items like: 1. Boiler2. thermostats3. switching relay4. pumps5. Added plumbing6. radiator7. Zone control8. etc.