“I swapped out a Taco SR-503 with this EXP model because it offers a C terminal for each of my smart thermostats. Really easy to wire, and works flawlessly.”
“Used TACO in combination with Honeywell's Series 8000/WiFi Thermostat. Did not require use of resistor for our application. The High Current Capacity of this switch makes it versatile and has 240Vac capability. Also operates quietly when relay(s) are energized.”
“This is a high quality switch. We are using it with our infloor radiant heating system to separate the zones. Each pump is activated by a dedicated tstat activating a specific zone pump. This also has the ability to set a priority zone what will override the call from other zones. Great for DHW. Be aware that some boilers have their own DHW priority logic even when using an indirect fired water tank. In that case you can use priority for a specific designated zone.”
“Replaced an old controller with this Taco SR504-EXP-4 cone controller. In addition Taco has one of the best technical support teams for their and other makes of hydronics/heating & cooling products.”
