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Thread: Cold Water Supply reduced to 3/4" before water heater...

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    DIY Senior Member speede541's Avatar
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    Default Cold Water Supply reduced to 3/4" before water heater...

    Hi all,

    I'm making a last minute rerouting to my incoming copper water supply line prior to closing up the wall.

    The plumber who installed our water line ran 1" copper about 60 feet into the back of the house. Along the way, the 1" line hits the basement (ground floor in-law apartment) master bath, branches to the upstairs bath + laundry, branches to the main kitchen + backyard hose bib, and also supplies the basement kitchenette.

    Then, 15 feet before reaching the water heater, it's mysteriously reduced to 3/4" copper. Along that final 15' run, the 3/4' line branches to the basement laundry and a half-bath above, before it finally terminates at the boiler-fired indirect water heater.

    I'm re-routing a portion of this 15-foot run of 3/4" copper around some new duct work, and wondering if I ought to stick with 3/4", or upsize it to 1". I'm sure there's no harm in upsizing it, but it'd be easier not to if there's no real benefit.

    Hot water requirements for the house will be 3 full baths, one half bath two laundries, kitchen + kitchenette, and at least one dishwasher and possibly two.

    Any words of wisdom?

    Water pipe sizing
    Last edited by Terry; 09-01-2011 at 02:46 PM.

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