4 zone switching relay or 6 zone switching relay

I will have 3 heating zones, an indirect water heater and a central air for cooling. Just wondering which switching relay control box I should buy, 4-zone or 6-zone?

Somewhat depends on the boiler...some have internal controls for the indirect...but, it sounds like you'd only need the 4-zone controller. The only benefit of the larger one is a couple of built-in spares for relays...many are plug-in, and you can buy they separately. I may be missing something here...

diyfun said:

I will have 3 heating zones, an indirect water heater and a central air for cooling. Just wondering which switching relay control box I should buy, 4-zone or 6-zone?

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Ever done any zone control wiring?