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recirc. for tankless

Gary Jansen_4
Gary Jansen_4 Member Posts: 77
in THE MAIN WALL
The Taco D'mand system works well with tankless heaters. I have installed or specd a number of them. You could connect switches, timers(I don't like timers), or even motion detectors(my personal favorite) even wireless in any or all bathrooms. Go to taco-hvac.com and check it out. Regards, Gary

Comments

  • Jim Wy.
    Jim Wy. Member Posts: 43
    recirc. for tankless

    Does anyone have opinions on the best way to install a recirc. line w/ a tankless ? The heater is 60 feet from the furthest fixture in a 5 bath residence.
  • ChrisHoskin
    ChrisHoskin Member Posts: 3
    recirc with tankless

    The problem with most recirc and tankless systems is either short cycling or the recirc flow rate is not high enough to get the water heater to fire. Best solution IMHO is to put an electric mini-tank under the distant sink. If there is no space under or near the sink, at least do the recirc to the mini tank. Bosch carries (carried?) the Ariston mini-tank that was great for this kind of thing. Good luck. Chris
  • Mike.C_2
    Mike.C_2 Member Posts: 7


    ariston 6 or 8 gal. tank and plumb like most tankless manuals show. Most tankless makers will shorten the warranty if you pump through the unit. This also solves the cold water sandwich that occurs with tankless units. I have installed the tanks w/o a recirc for that reason. If you need help setting it up let me know. I use the Grundfos comfort pump timer and all built in nice and neat with a pigtail ready to go! easy install.
  • Gary Jansen_4
    Gary Jansen_4 Member Posts: 77
    That is why I use the Taco

    D'mand system. If you follow their directions you will not pump through the tankless heater. That is why it is one of the few systems that do not void the manufacturer's warranty.
  • amhplumb_2
    amhplumb_2 Member Posts: 62


    I have never installed a DHW re-circulator when I have installed a particular tankless heater that we use. However, the mfg. recommends that a small electric tank type (2-gal) water heater be installed in parallel with the tankless heater. The DHW supply is then taken from the small tank to the fixtures then re-circulated back through the small tank. The small tank's heating elements will maintain the temperature of the water that is being re-circulated. Whenever a fixture is turned on somewhere, the pressure drop will cause the tankless heater to activate and immediately supply hot water through the small tank. The question here is, is the cost of purchasing and operating the small tank and circulator worth the savings in the water and sewage charges without re-circulating? Or can you move the tankless closer to the fixtures?

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