Tempering Valve

Discussion in 'Water Heater Forum, Tanks' started by countryhouse, Jun 8, 2009.

  1. countryhouse

    countryhouse New Member

    Apr 15, 2009
    North Carolina
    I just installed a Jacuzzi whirlpool tub. To help fill it, I would like to install a tempering valve at the hot water heater and raise the temperature of the WH.

    Right now the water is set around 130 degrees. By using the tempering valve, I can use the existing (40 gal) WH that is only 4 yrs old. Whomever installed the WH (we just bought the house a few years ago) necked down from 3/4" to 1/2" copper right at the WH inlet and outlet. All the lines in the house are 1/2" only.

    My question: If I buy the Watts 70A tempering valve, which has 1/2" connections, will this noticeably impede the flow? Or should I buy the 3/4" connection model and plumb it in. I'm not sure how much flow restriction the 1/2" model will have. There has to be enough flow to fill the tub in a reasonable amount of time. Right now, without a tempering valve, it fills fairly quickly.

  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    If all the supply pipes are 1/2", it probably won't make any difference going bigger...see what the pros say.
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  4. kingsotall

    kingsotall Plunger/TurdPuncher

    Aug 17, 2008
    Hand copper part cleaned ready to go
    Flagstaff, AZ Sitting on an upside down 5 gallon b
    I'm still trying to figure out what you are hoping to achieve with the tempering valve. Some of the statements you made seem to negate what one would want to achive when filling this type of tub.
  5. Master Plumber Mark

    Master Plumber Mark Master Plumber

    Feb 6, 2005
    Sensitivity trainer.. plumber of mens souls
    indianapolis indiana - land of the free, home of
    you are already screwed

    A 40 gallon heater will not fill up a whirlpool tub

    you can set the thing to 170 and it still wont fill up
    that tub....

    forget the tempering valve,

    install a 50 or a 75 gallon heater
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