I like wiring the taco control to handle all the circs and the DHW priority {simple, just connect zr to dhw circs L1 wire}...I like that 3250+, it has some decent features for its cost, ODR is a must when you are trying to save energy, but you will want efficient circs because the run times will be much longer...I hope this helps, not sure about the specifics about your system but this is pretty b