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Wiring timer into indirect water tank

PG13 Member Posts: 2
I have a honeywell  aquastat  on my indirect . It's  wired into it on one of 4 zones on my taco switching  relay. How can I wire a timer into this, so I can shut it off during  night. 


  • mattmia2
    mattmia2 Member Posts: 5,506
    edited May 6
    You would put the control contacts from the timer in series with the aquastat. You will need a timer where the contacts are isolated from whatever is powering the timer.

    Note that a well insulated indirect probably won't cool enough to trigger a dhw call in 8 hours unless it was close to the cut in temp of the aquastat from a hot water draw or you are using some hot water during the night.
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 3,183
    You could do this and place a timer on the oil valve or gas valve to see if there is a significant reduction in burner operation over the summer months when there is no call or heat. Maybe 2 months with timer active and 2 months without timer active. I bet you won't see a very big savings as @mattmia2 indicated
    Edward Young
    Retired HVAC Contractor from So. Jersey.
    Services first oil burner at age 16
    P/T trainer for EH-CC.org