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circulator advice for single zone hydronic with indirect

ron Member Posts: 217
edited March 29 in Thermostats and Controls
small single level ranch, will be doing replacement oil fired boiler having a ~40 gal indirect for potable hot water. The house has 1 zone baseboard hydronic heat.

Looking for recommendations on what is the best smart circulator these days for the one size baseboard heating?

And I was planning on a basic taco 007 on 3/4" or 1" piping from the boiler to the indirect, and using a check valve to separate it from the heating, unless there's a better way? I believe the boiler I'll eventually be getting comes with one circulator, which I'm thinking would be fine to pump to just the indirect hot water tank? So no zone valves and would do a hydrostat as the control for boiler firing and pumping the 1 zone heat and the indirect. Is there a better way? Thanks.


  • MikeAmann
    MikeAmann Member Posts: 422
    edited March 29
    The Taco circulators now have built-in check valves.
    I have the same setup that you are proposing using two Taco 007s - one for heating, and the other for the IWH. No zone valves and a Hydrostat controller. All you need is a RIB (relay in a box - has it's own transformer) to switch the circulator for the indirect with a CFH from the IWH thermostat. The other contact is used to fire the burner. It does not get any simpler.

    The thermostat controls the power to the relay thru a 24 volt trans. The relay is 2 pole, one pole turns on the pump and the other pole closes the end switch on the boiler.