My understanding of the Bosch Hydro units is that there is just a hydro generator in the water line, no other gear, water runs, it sparks and lights. the service manuals I have do not have that model in them. I plumbed one last summer and don't remember any controls, they are as simple as can be. The lower pressure is 15 PSI, and 1/2 GMP or it will not heat.
Bob On Fri, Nov 14, 2008 at 8:00 AM, Bill Loesch <[EMAIL PROTECTED]>wrote: > > Hi Todd, > > Congrats on the off-grid solar application to improve quality of life. > > I will defer to my more learned colleagues re the optimum water pressure > pump. > > If you don't want to use any electricity to create the hot water, then you > want to use a *natural draft* tankless. (Like a conventional tank, no > electricity required.) Please be aware of the minimum flow requirements to > turn on the tankless - something on the order of a half gallon per minute. > Less flow than that and the tankless will not fire. If you can find any, the > (out of production) piloted Paloma PH series (some folks have said it > resembles R2D2) would work on much lower water pressure than the Bosch > series which work reliably only with a minimum of 30 psi (e.g. the lower > limit of your pump switch would be set to 31 psi or more). > > The hydro generated Bosch model sounds great in principle and were able to > provide you a tax credit in the previous tax credit program . What is > required for the hydro generated models to work (in addition to the hydro > generator) is an expensive electronics box and a multitude of > connectors which IMHO are not up to the rigors that the piloted models > offer, especially in less than pristine environments. The piloted models > utilize a thermocouple which most everyone is familiar with and has many > fewer connectors. Most all the natural draft piloted tankless machines > incorporate a piezo igniter like on your BBQ grill, so turning off the pilot > manually and relighting as required is nowhere near the contortionist effort > experienced with a tank and provides the savings of no pilot gas usage when > not working. > > Good luck, > > Bill Loesch > Solar 1 - Saint Louis Solar > > ----- Original Message ----- > *From:* Todd Cory <[EMAIL PROTECTED]> > *To:* re-wrenches@lists.re-wrenches.org > *Sent:* Thursday, November 13, 2008 7:58 PM > *Subject:* [RE-wrenches] tankless hot water and pumping question > > I am working on a semi-volunteer job for a local non-profit. It is off grid > with water being trucked in and stored in a ground level polyethylene tank. > > I need recommendations for: > > 1) A 24 volt DC pressure pump. This is a single residence so can be > relatively low volume as it will only feed a shower or sink... no > irrigation. > > as well as > > 2) Which tankless (propane) hot water heater would be best? I think there > is one that uses the water flow to spin a tiny generator that ignites the > burner. Being off grid it is important to not have a unit that draws power > 24/7. > > Thanks, > > Todd > -- > Todd Cory KE6SXS > > [EMAIL PROTECTED] > Mt. Shasta Energy Services License C-10 #811428 P.O. Box 689 Mt. Shasta, > CA. 96067 > > *(530) 926-1079* > > *<!--[if !supportEmptyParas]--> <!--[endif]-->* > > "I'd put my money on solar energy...I hope we don't have to wait till oil and > coal run out before we tackle that." > > ∞ Thomas Edison, in conversation with Henry Ford and Harvey Firestone, > March 1931** > > <!--[if !supportEmptyParas]--> <!--[endif]--> > > ------------------------------ > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > ------------------------------ > > No virus found in this incoming message. > Checked by AVG. > Version: 7.5.549 / Virus Database: 270.9.2/1785 - Release Date: 11/13/2008 > 9:12 AM > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > >
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