Posted by spshaffer on November 5, 2006, 6:30 pm
We are putting on an addition to our house, and while we would love to
put some panels on the roof (for hot water), it's just not in the cards
But, I do want to be prepared when it is time. So I was thinking while
the walls were opened up to go ahead and have the plumber run some
copper from the attic to the basement and stub it off.
What size copper would be the best bet for him to run...1/2 or 3/4?
Posted by Morris Dovey on November 5, 2006, 7:29 pm
| Afternoon All,
| We are putting on an addition to our house, and while we would love
| to put some panels on the roof (for hot water), it's just not in
| the cards right now.
| But, I do want to be prepared when it is time. So I was thinking
| while the walls were opened up to go ahead and have the plumber run
| some copper from the attic to the basement and stub it off.
| What size copper would be the best bet for him to run...1/2 or 3/4?
Water heating is not my forte, but I'd suggest a double run of
well-insulated 3/4" tubing (plugged at both ends until you're ready to
DeSoto, Iowa USA
Posted by Mary Fisher on November 5, 2006, 8:25 pm
We have a solar water heating panel and we've found that the narrower piping
the better, with more insulation than you think will be enough. The smaller
diameter means that you have less dead water coming through the taps.
Posted by Gary on November 5, 2006, 8:33 pm
I think thats a really good idea.
If you want to preserve the option of using a drain back system, the minimum is
3/4 inch, and all of the pipe needs to slope down at a minimum of 1/4 inch per
foot (or more -- vertical is fine). In a drain back system, all the water
drains back to a tank inside the house when the sun is not on the collector for
For closed loop systems with antifreeze, it depends on how much collector you
have, how long the pipe run is, and what kind of pump you want to use. As a
real rough guess, half inch pipe starts looking marginal for more than 40 sqft
of collector. If it were me, I'd just go ahead and use the 3/4 inch -- even at
the current prices of copper :)
You might want to have a look at this simple Solar Site Survey to see how good
your site is for solar, and where might be the best location for collectors:
You might also want to look at the solar water heating system "Basics" articles
here to get an understanding of the basic systems:
They are free downloads from the Home Power Magazine site, and very good.
It might make sense to also allow room somewhere for a solar heated water
"Build It Yourself" Solar Projects
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