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By design hot water temp fluctuations

STEAM DOCTORSTEAM DOCTOR Member Posts: 1,142
Hi. Received call from potential customer. He is building house from scratch. He wants different hot water temps, different days of the week (don't ask why, long discussion). Is such a thing possible? Indirect with two auqastats controlled by timer???? Any thoughts or ideas would be greatly appreciated. FWIW, he is not looking for anything tankless. Its basically a weekday, weekend thing.

Comments

  • ratioratio Member Posts: 2,332
    A T775 with a schedule to set the temp back would do it.
  • STEAM DOCTORSTEAM DOCTOR Member Posts: 1,142
    Thank you @ratio. Will give a look. New world for me.
  • hot_rodhot_rod Member Posts: 13,188
    A motorized mixing valve? Maintain tank at 140F plus for legionella protection, motor valve to desired temperature.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
  • STEAM DOCTORSTEAM DOCTOR Member Posts: 1,142
    @hot_rod. Thanks for the suggestion. I am looking for something programmable. To allow for different temps on weekdays and weekends. Not sure if zone valve would accomplish that. My ears are open. Thanks.
  • hot_rodhot_rod Member Posts: 13,188
    It's probably overkill but the Caleffi Legiomix allows you to program in a high temperature mode for legionella protection.
    It watches both supply and reciurc return for assurance, somehow you would need to use both sensors.
    Does the system have recirculation?

    https://www.caleffi.com/sites/default/files/file/h0002997-05_na.pdf
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
  • STEAM DOCTORSTEAM DOCTOR Member Posts: 1,142
    Thanks Hot Rod. Will take a look. System doesn't exist yet. They are building house from scratch.
  • STEAM DOCTORSTEAM DOCTOR Member Posts: 1,142
    Don't have any details or plans. I am assuming they are open minded.
  • hot_rodhot_rod Member Posts: 13,188
    Without knowing his intent, it's hard to say which option would be best, but you have a number of workable options. Does he want a quick switch, or could the tank be depleted down to the lower temperature?

    If you do it with valves, they all need to be low lead of course.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
  • STEAM DOCTORSTEAM DOCTOR Member Posts: 1,142
    I think that he would prefer something that adjusts tank temperature
  • EdTheHeaterManEdTheHeaterMan Member Posts: 480
    edited May 21
    L4081 and L6081 controls have 2 sets of contacts with one sensing bulb. This is really old school but with the proper wiring design you could change the temperature with a switch upon arrival on the weekend, then return the switch to low temp on Monday..



    For automatic control, an Intermatic timer could be implemented.
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