Hot water at summer camp [RE-wrenches]

[Holt Kelly]

Darryl,
Could you eleaborate a bit on why the customers were "unhappy" and on 
the "tricks needed" for uniform temps? The only complaint that I have 
gotten on electric tankless (besides spinning the meter at 1000rpm)is 
the loud clicks of the relays during start-up (Eemax brand). Thanks for 
your input. 




Darryl Thayer wrote:
> 
> Hello
> I agree, except for the back-up heater.  I have
> installed up to 70A-240 volt instant heaters with
> unhappy customers.  I have installed even the TAGAI
> which is rated for solar with unhappy customers
> because of the tricks that must be played to get a
> shower of uniform temperature.  If the goal is
> reasonable showers then use a tank type back up
> heater.
> Darryl 
> --- Bill Loesch <solar1online at charter.net> wrote:
> 
> > 
> > Hi Holt,
> > 
> > Good thinking! If the hot water load is after the
> > sun can work all day, the
> > ICS heaters are probably a good bet for simplicity
> > (and relatively low
> > cost). You have checked the structure for your dual
> > ICS installation?
> > 
> > You need to choose a backup heater that is
> > compatiable with preheated water
> > (not all are). As a minimum, a temperature sensor
> > for _incoming_ water would
> > be required. Be aware of the very large electrical
> > demands of an electric
> > tankless capable of providing heated water for a
> > single shower. Compute the
> > temperature rise with the _lowest_ water temperature
> > that will reach the
> > heater, probably in winter, not the _average_ water
> > temperature that so many
> > of the clueless tankless marketing folks promote.
> > Add dual drain valves
> > inboard of the dual shutoff valves so that manual
> > descaling is a relatively
> > simple operation if/when the tankless heat exchanger
> > becomes blocked.
> > 
> > Finally, for both the benefit of the ICS and the
> > tankless (and any other
> > appliance in the hot water distribution) if you have
> > hard water (and
> > especially very hard water) you _NEED_ a water
> > softener (preferably
> > installed only on the hot water side) for minimal
> > maintenance.
> > 
> > Good luck,
> > 
> > Bill Loesch
> > Solar 1 - Saint Louis Solar
> > 314 631 1094
> > 
> > 
> > ----- Original Message ----- 
> > From: "Holt Kelly" <holtek at sbcglobal.net>
> > To: <RE-wrenches at topica.com>
> > Sent: Friday, March 16, 2007 10:42 AM
> > Subject: Hot water at summer camp [RE-wrenches]
> > 
> > 
> > >
> > > I have been asked to design a hot water system at
> > a summer camp. 21
> > > seperate sytems. Hot water for showers is used
> > from 4:30pm to 5:30pm(14
> > > showers)per system, very little use the rest of
> > the day. Solar resource
> > > is excellent to fair. My initial thoughts were 2-
> > 40gal passive
> > > collectors with an electric tankless backup (need
> > to keep maintenance to
> > > a minimum). Or possibly Helio-flo with single
> > tank. Any thoughts out
> > > there?
> > >
> > > Holt E. Kelly
> > > Holtek Fireplace & Solar Products
> > > Waco, TX.
> > >
> > >
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Holt E. Kelly
Holtek Fireplace & Solar Products
Waco, TX.


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