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Re: Water heater capacity for occational use ski cabin - Page 2

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Posted by nicksanspam on April 14, 2006, 10:24 am

Hmmm. Something that sits inside the tub, eg 2 18"x36" copper plates
1/4" apart, bolted or brazed together with internal copper bar spacers
and a rubber mat or feet beneath, with a male hose thread at each end?

Or an all-copper bathtub, with tubing soldered beneath?

How would we keep it from cracking and leaking?


Posted by meow2222 on April 15, 2006, 1:12 am
nicksanspam@ece.villanova.edu wrote:

I'm not clear what tub you're referring to here, the shower tray, the
exchanger tray or a bath tub.

As a permanent fixture it doesnt sound counterflow. As a temp lashup it
sounds more work than 4 bits of microbore bent into a spiral with a
manifold at each end, plus the parts cant be reused in the final
finished item.

ISTR space was limited, so introducing a bathtub may not be the best


Posted by Morris Dovey on April 15, 2006, 5:15 pm
 The original post didn't appear on my server so I'll respond here...

|| I have a ski cabin with a 60 gal water heater.  There are two
|| showers. This house was built originally for a couple, but when I
|| use it I have as many as 14 guests stay at a time during ski
|| season.  Even if people take quick military showers, when you get
|| to the last few people they end up with cold showers.  Not sure if
|| this is due to the heater capacity, or if due to the mountain cold
|| water (probably just above freezing) that is flowing in to the
|| tank.  To make maters worse, this heater runs off slow burning
|| propane and is at high altitude - seems to take anywhere from 2-4
|| hours for the tank to get hot even at max temperature setting.
|| There is not a lot of room anywhere to put a second tank, so...
|| ... Has anyone tried putting a on demand system between the water
|| main and the input to a conventional heater such that the incoming
|| water
|| is much warmer ?

I haven't; but since the thread has already wandered off into a
discussion of heat exchangers, why not borrow from warm-climate
sailing where water is solar heated in a black plastic bag for on-deck
group showers. It makes a small amount of hot water go a long way (a
gallon and a half or so per person).

Try to save a bit of hot water from the group shower(s) for any
self-conscious types who value privacy more than warmth. :-)

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

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