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RE: A Plumbing Problem



Details are obviously needed. I'm planning on finding some more out this
evening. It seems to me that the tanks are probably feeding different parts
of the building (parallel). Since they are bothe supplied by the same line,
I think the larger capacity input line would lead to more flow and therefore
quicker loss of hot water (assuming both sides are drawn from about equally).

Can we assume the water heaters are connected in parallel?

I have seen a case in a home where there were two water heaters hooked in
series with the first heater set at approx 100 degrees F and the second
at 120 degrees F. As I understood it, the series combination was to
reduce the recovery time so as to allow the homeowners to fill their
jacuzzi and still be able to produce hot water with a minimum of time
delay. Putting them in parallel would produce more hot water but would
require each to be at the same hot temperature needing more energy.
Makes sense???

In parallel, the larger inlet pipe would result in a lower resistance
leading to that heater "using up" its hot water first.

Oren Quist
SDSU

----------
From: Allen Shotwell
Sent: Tuesday, March 24, 1998 1:03 PM
To: QuistO; RAUBERJ; phys-l
Subject: A Plumbing Problem


A friend of mine called with an argument he is having with his plumber.
At
his business (a health club), he has two water heaters (or should I say
hot
water heaters?) of equal capacity. Both have an outgoing, hot water pipe
that is 3/4". One has an incoming (cold water supply) pipe that is 1.5"
and
one has an incoming (cold water supply) pipe that is 3/4". He says that
the
water heater with the larger supply line runs out of hot water faster and
claims that it is because of this larger supply line. His plumber says
no.

I have monkeyed around with the problem some this morning. What do you
think
gang?


BTW both heaters were installed at the same time. One is not a good deal
older and (by extension) a good deal more crusted up.




R. Allen Shotwell
Chair, Science and Math
Ivy Tech State College
Terre Haute, IN USA





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R. Allen Shotwell
Chair, Science and Math
Ivy Tech State College
Terre Haute, IN USA