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    miguelito3218's Avatar
    miguelito3218 Posts: 60, Reputation: 1
    Junior Member
    		  
    #1

    Feb 7, 2007, 09:05 PM
    Half inch feeding hotwater heater: 2 baths
    Tom,
    I know your supposed to bring 3/4" lines for water to new bathroom, then branch off in 1/2 inch.

    But, but inlet water to water heater comes in at 1/2" and feeds my bathroom and kitchen on half inch, at least for the hot water.

    I am tappin off the water inlet to the water heater, and also the hot water out for the new bathroom.

    Question is: should I run a 3/4 line off the 1/2" mains, and then branch off into 1/2" again at my fixtures, in anticipation of re-plumbing my mains in the future to get a 3/4" feed? or just run my new bathroom all in 1/2"? Thanks.
    nick_mathew's Avatar
    nick_mathew Posts: 17, Reputation: 1
    New Member
    		  
    #2

    Feb 8, 2007, 01:04 AM
    What kind of water heater younar using? Tankless type or tank type. Water Heater are designed with their port, ussually calculated for their capacity. I believe you should stick to 1/2". by increasing your pipe to 3/4" doesn't help, it only dampens pressure, reducing it. I think its not a problem with 1/2", in case you wanted remodelling, you can use circulating pump to increase your output, in case you are using a tank type. Have a nice day.
    miguelito3218's Avatar
    miguelito3218 Posts: 60, Reputation: 1
    Junior Member
    		  
    #3

    Feb 8, 2007, 06:42 AM
    It's a regular 30 gallon tank with 3/4" inlets, but it was reduced to 1/2". I think I will stick to the 1/2". Thanks.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #4

    Feb 8, 2007, 07:35 AM
    "Question is: should i run a 3/4 line off the 1/2" mains, and then branch off into 1/2" again at my fixtures, in anticipation of re-plumbing my mains in the future to get a 3/4" feed? Or just run my new bathroom all in 1/2"?"

    Nick was correct when he advised, "I believe you should stick to 1/2". By increasing your pipe to 3/4" doesn't help, it only dampens pressure, reducing it."
    He was not when he said," i think its not a problem with 1/2", in case you wanted remodelling, you can use circulating pump to increase your output."

    You can not increase volume by adding a recirculating line. You simply can not get more volume out of a system that you put into it.

    There would be no reason to increase to 3/4" after you've choked it down to 1/2".
    Code mandates that no more then three fixtures be supplied off a 1/2" branch, However my 1950's house is supplied with 1/2" and it's not been a problem for two of us that live here so I'm not condemning it. Good luck, Tom
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