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Need to replace: Flair RTU 100b connected to White-Rodgers 3 wire zone valves
I have a 3 zone boiler/ radiant heat system in my home. The zone valves are White-Rodgers Type 1311-102, 3 wire valves. These are wired into a Flair RTU 100b relay/ transformer that is failing. Had a heating guy come out, and he said that he has to either:
a) pull the 3 wire valves and replace them with 2 wire ones;
b) run an individual relay to each valve.
Either option is going to cost me more than I think it should. For the life of me, I cannot believe that there isn't a suitable replacement for the Flair RTU 100b out there that can work with my boiler and my existing valves.
Any thoughts/ ideas I should be looking at? (I am completely new to this.)