I am not sure where you got that about being able to stand 180 degree water.
My diesel truck runs the coolant at just above 180. Wrap your hand around
one of the coolant hoses and see how long you can keep it there. I'm
kidding, of course. You would burn yourself. Don't even try it. It is only
32 degrees from the boiling point. You can cook pasta or eggs in 180 degree
water. Put your oven at 180 and stick a dish in it for a little while then
try to take it out without an oven mitt if you want proof but don't do it
with the grandkids around unless you want them to learn some new words to
take to school.

-----Original Message-----
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Wally
Bryant via CnC-List
Sent: Monday, July 21, 2014 2:35 PM
To: cnc-list@cnc-list.com
Subject: Re: Stus-List Set up of shower in Cockpit

Based on what I've read so far, I wouldn't do it.  Mainly because if you
have to ask, you don't know your exhaust system well enough to mess with it.
<G>

However, the idea has some merit in a limited sense.  For example, on my
boat I have an anti-siphon loop between the heat exchanger and the exhaust
riser elbow.  I think that's required by ABYC, but could be wrong.  Anyway,
the top of that loop has a ball valve to a hose that dumps overboard.  The
idea is to take excess raw water and dump it overboard before it gets to the
exhaust system, to reduce back pressure 
on the diesel.   A human hand can really only stand temps below 180F, so 
if you can hold your hand on the metal of the exhaust riser at the point
where it meets the exhaust hose, and leave it there without saying 'ouch'
then the exhaust is about 180F and shouldn't melt your hoses or water lift
muffler.  I dump a heck of a lot of water overboard before it gets to the
exhaust, and that's probably good given the length of the hose run from
engine to stern.

But, really, that water is *hot* coming from the engine.  So you'd need to
add one of those fancy cockpit shower faucets to mix hot and cold, and the
cold would be coming from your tank unless you add another cold water input
somewhere with a separate pressure pump.  Then there would be a whole lot of
plumbing and valves to deal with, to bypass the shower when not taking a
shower.

Frankly, it would be easier, safer, and less expensive to soap off and jump
overboard.  I don't know what your water temps are like...  Maybe you could
hang six or seven Sun Showers in series...  (joke)

Wal


you wrote:
> so pulling any cooling water away from the exhaust system would most
likely damage the system.


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