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Separate circulator or zone valve for indirect?
My home has a HW heating system (single zone) with a coil. As part of an overall replacement of the whole system I want to install an indirect HW heater; the radiators will still be on a single zone. Is there any compelling reason to go with using a separate circulator for the indirect versus using a single circulator and two zone valves? The cost differential for a second circulator versus zone valves really isn't important in the grand scheme of things; I'm more concerned with longevity and idiot-proof set-up. Would the use of two zone valves make the DHW priority wiring more straightforward?