“Needed to fix the rats nest of wiring on my boiler. Rather than having to retrace and sort out the transformer load, I was able to connect the valves and tstats to this and it all works great.”
“Had a lower-tier Taco ZVC in place with a high-efficiency Utica boiler before. That Taco didn't have a priority circuit for DHW so the installer jury-rigged a series of relays to accomplish the same thing. One of the relays (I assume) started going bad so the central heat circuit wouldn't always flip back on when DHW thermostat flipped off.Going from Taco to Taco was pretty seamless, except that the first one (Used, Like New through plumbingsupplyandmore Warehouse) arrived with a loose connection between transformer and PCB. No problem; returned and bought new.FWIW, the Taco assumes that current needs to be going to the boiler pump end switch(es). The Utica I have just needs dry switches for DHW and CH pumps; I was able to figure this out without much trouble, but a note about this in the installation manual would be useful.”
