Should i insulate my hot water copper pipe?

Question

I noticed that if i use hot water in my kitchen less frequently than few times per hour then the water takes a while (about 30sec) to warmup again next time. I visited my crawlsoace and found indeed about 15 feet of naked copper pipes, and noticed than after 20min they have indeed lost their heat radiatively

So to reduce the water and energy waste would it make sense to put some insulation around the pipe (the one for the hot water, i live in California, the cold pipe never freezes)?

Anyone did this? Why is it not there already (is it impopular)? should i go sleeved foam tube or fiberglass? Do you see lower bills?

Answer 1

Yes, insulating your hot water pipes will help save energy.  Use closed cell foam.  It comes in lengths of about 6’ with a slit down the middle of it.  You will probably need insulation to fit both ½ and ¾ pipe, I suggest cutting the foam insulation with a hacksaw blade (not razor knife).  Miter corners and cut away insulation at “T” intersections as necessary.

Finally, you should also consider using nylon “zip ties” as required (every 3 – 4 feet or so) to fully secure the insulation to the pipe.  Good Luck!