"ransley" wrote in message
oups.com...
On Nov 6, 7:10 am, wrote:
On Mon, 05 Nov 2007 20:44:29 -0800, wrote:
Dear Readers,

What are you, Ann Landers ?

Pls keep this stuff out of alt.hvac.



The supply/return pipes that come out of my furnace (I've learned not
to call it a boiler) are threaded black pipe. Only after the
circulators and expansion tank are they changed to copper. I assume
this is to help bear the weight of these pieces of equipment on the
line. Am I correct? Or is it that copper pipe cannot be within a
certain distance to the furnace due to heat or possibility of galvanic
action or some other reasons? Any ideas?

Thank you.
Regards,
Anthony

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Boilers heat water, furnaces heat air.

I always thought boilers boiled something, maybe water, and furnaces heated
something, maybe air or steel. 8)

Don Young