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Originally Posted by spring3100
my Hot Water branch circuits are 1) 1/2 to the kitchen
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As long as that pipe supplies nothing else besides the kitchen sink and dishwasher, you are fine to tie that existing 1/2 into your new upgraded mainline.
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2) 1/2 to the two upstairs bathrooms
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This needs to be upgraded all the way up.
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3) 1/2 to first floor lavette and
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What's a lavette, is that like a powder room or half bath (no shower or tub)? A powder room only has one lav sink that requires hot water, so you could tie the existing 1/2 into your new upgraded mainline.
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4) 1/2 to washing machine,
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As long as that pipe supplies nothing but the washing machine, you are fine to tie the existing 1/2 into your new upgraded mainline.
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