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dan orourke
07-14-2007, 05:05 PM
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Jerry Peck
07-14-2007, 05:57 PM
Is it a requirement for water heaters' water supply lines to be insulated?

Oklahoma City is shown as having a 13 degree design winter temperature degree day, which is less than 32 degrees. ;)

Being as those lines are outside the thermal insulated envelope, yes, insulation (or heat - or both) is required.