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Thread: Help with supply for Grohe Atrio Roman tub filler

  1. #1
    DIY Member backwaterdogs's Avatar
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    Default Help with supply for Grohe Atrio Roman tub filler

    Hello,

    I'm installing a Grohe Atrio roman tub filler faucet. The supply lines I have are 1/2" (but 3/4" not too far back). The inlet to the valves are and spout are all 3/4" and was wondering if the supply should also be 3/4".

    The rated flow for the faucet 13.2 gpm and it's filling a big darn tub. I don't want to sacrifice flow, so can get 3/4" supply if need be.

    Also and this may answer the above question, but there are two valves, 1 hot 1 cold and you need to plumb from each supply to the valve and the outlet from the valves 'T' into the spout. How would it be best to plumb this? Should I sweat in threaded adapters and use flexible supply hose or sweat copper in between everything? Hose would probably a lot easier for me and not sure if I can safely sweat everything...very close to an acrylic tub! I assumed all the flexible stuff will be 1/2" tho.

    I am leaving an access panel and this won't be getting inspected, so PEX is an option for me too.

    Thanks for all your help!
    Last edited by Terry; 06-08-2011 at 09:37 PM.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    The flow through 3/4" is nearly double that of 1/2", so run 3/4" to your 3/4" valve. Pex is too restrictive for your application - while the outside is nominal for 3/4", the inside is barely bigger than 1/2" copper since the wall thickness is greater. You don't want any hoses in that connection. I'd solder it. You can buy heat shields to aid you in keeping heat away from parts you don't want to. Keep a spray bottle of water around, too. If you are not comfortable, a plumber might be a cheap alternative to ruining the tub.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    Moderator & Master Plumber hj's Avatar
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    IN many cases, trying to fit hoses into that area will create some very tight bends which could "kink" the hoses and reduce their capacity.

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    One who lurks Basement_Lurker's Avatar
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    If you have 3/4" trunks nearby, you should take advantage and run them to the tub. I wouldn't mess around with trying to solder inside the access port as you will only destroy the tub, and using braided flex hoses is a bad idea in a concealed space (even though there is an access panel). You are better off saving yourself a lot of grief like these guys are telling you and hire a plumber.
    Broken promises don't upset me. I just think, why did they believe me? -Jack Handy


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  5. #5
    DIY Member backwaterdogs's Avatar
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    Default Grohe Atrio Roman Tub filler install

    Hey all,

    Am installing a Grohe atrio roman tub faucet and this is different from any faucet i have don as the spout and control valve are all separate.

    Basically, each control value has 3/4" 'T' (sweat fittings). My supply is 1/2.

    Would be very difficult to mount everything and sweat the joints as the tub deck is raised and I'd burn the tub up or something.

    I guess i will need to sweat a threaded fitting and use flex hose.

    Is this a big issue? It's going behind a tile access panel.

    Also, 1/2 supply to this 3/4" faucet..is that ok?

    Last edited by Terry; 06-08-2011 at 09:36 PM.

  6. #6
    Forum Admin, Expert Plumber Terry's Avatar
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    You can prefab much of it before it's installed in the deck.
    If you have 1/2", that will be fine. It's better with 3/4".
    Don't use the flex connectors in that location. They reduce down to 3/8", which will increase fill time by quite a bit.
    Also, once the tile goes in, you will have no way to replace them, and frankly, I don't consider the flex connectors are being permanent.

    Normally, I solder on some street 90 els and point them down with sections of copper pipe. That gets me away from the deck, and then say about six inches below I can start to connect them up.

    If this was run in 3/4", you would have 12.6 GPM at 45 psi

    Last edited by Terry; 06-08-2011 at 09:26 PM.

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    DIY Member backwaterdogs's Avatar
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    thanks for the reply, terry!

    I have messing w/ this project for too long...started awhile back and got side tracked...I see where I should have stayed focused...could have gotten to the 3/4 line if i done back when I started...but too late now, basement ceiling is finished now...will have to live w/ 1/2.

    Will follow your advice tho and drop down to avoid the tube...will solder everything.

    thanks again!!

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    DIY Junior Member harmonk's Avatar
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    Hi Terry,
    New to this site, and looking for info about a Grohe bathtub faucet. I am trying to replace washers etc inside it, and can't remember the order of some parts. Where did you get this exploded diagram? It would be a great help for me here.
    Thanks in advance for any info. Cheers, Mk






    Quote Originally Posted by Terry View Post
    You can prefab much of it before it's installed in the deck.
    If you have 1/2", that will be fine. It's better with 3/4".
    Don't use the flex connectors in that location. They reduce down to 3/8", which will increase fill time by quite a bit.
    Also, once the tile goes in, you will have no way to replace them, and frankly, I don't consider the flex connectors are being permanent.

    Normally, I solder on some street 90 els and point them down with sections of copper pipe. That gets me away from the deck, and then say about six inches below I can start to connect them up.

    If this was run in 3/4", you would have 12.6 GPM at 45 psi


  9. #9
    Retired Defense Industry Engineer jadnashua's Avatar
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    http://www.grohe.com/us/6433/bathroo...G018&color=000 - Grohe has parts diagrams for all of their current line on their website. Sometimes, you can also find the installation manual, but if not, an e-mail to them will usually get it sent to you in a .pdf.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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