{"product_id":"slick-three-zone-switching-relay-for-hydronic-heat","title":"Slick Three Zone Switching Relay For Hydronic Heat Control With Streamlined PC Board Layout And Hassle Free Operation SR503 4 Brings Top Shelf Reliability To Your Whole House Comfort Setup","description":"\u003cdiv\u003eEfficient 3 zone hydronic heating relay sr503 control\u003cbr\u003e\n✔️ SR503-4 three zone valve relay 12x6x12 Inch dimensions \u003cp\u003eThis three zone switching relay manages hot water flow across separate home areas without complex wiring. You typically install it inside boiler rooms or utility closets to balance temperature demands while keeping the heating plant running smoothly. The unit pairs easily with programmable thermostats and external indicators so plumbers can diagnose issues fast on site.\u003c\/p\u003e ✅ UL certified internal components meet strict safety codes\n✅ Standard ice cube relays snap in for easy maintenance access\n✅ External indicator lights deliver instant operational feedback\n✅ Expandable architecture supports up to twenty priority zones\n\u003cbr\u003e \u003cp\u003e💡 Why are three zone switching relays handy for whole house hydronic heat control setups?\u003cbr\u003eManaging separate piping circuits independently keeps every room comfortable without oversizing your boiler plant.\u003cbr\u003e- Priority sequencing routes warm water to essential spaces first during peak demand\u003cbr\u003e- Modular relay sockets let contractors swap out failed modules without rewiring the control board\u003cbr\u003e- Plug-in power cards enable optional features like post purge cycling and pump exercise routines\u003c\/p\u003e✝️\u003c\/div\u003e","brand":"Amazon","offers":[{"title":"Default Title","offer_id":49306266796267,"sku":"VXB008G8S4ZQ","price":436.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/3268\/0683\/files\/6179LFhPcWL.jpg?v=1787866876","url":"https:\/\/vxb.com\/products\/slick-three-zone-switching-relay-for-hydronic-heat","provider":"VXB Bearings","version":"1.0","type":"link"}