Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

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: 9,843
    edited May 2022
    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: 8,157
    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

    After you make that expensive repair and you still have the same problem, What will you check next?