DIYbanter - View Single Post - Plumbing: What size hot water pipe do I need?

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wrote:

... be certain to insulate all hot water lines

How much energy would we save by adding R2 insulation to 100' of 1/2" pipe,
with 6 10 gallon hourly 110 F water uses per day at 3 gpm (an SRCC standard
test condition)?

Hint: not much, since there isn't much water in 1' of pipe, so it cools fast
between uses, even with lots of insulation.

Nick