[RE-wrenches] On demand WH

Tue Oct 1 13:50:32 PDT 2013

I have had a Bosch/Aqua Star 125 HX LP On Demand Water Heater installed and working flawlessly in my home since February of 2007 with a hydro generator that ignites the pilot and main burner when there is a demand for hot water.  With no demand for hot water, there is no standing pilot light and no propane usage.

The only adjustment I needed to make is with a 20/40 psi pressure switch or a 30/50 psi pressure switch on the pressure tank, the hot water heater started to taper down the hot water output on the low end of the cycle before the points closed and the pump came on.  I installed a 40/60 psi pressure switch and have had constant hot water when ever required.

Larry Brown
Sun Mountain
Olivebridge, New York
Nabcep Certified PV Installer

On Oct 1, 2013, at 12:19 PM, toddcory at finestplanet.com wrote:

> i remember hearing there was one brand which had a tiny hydro generator, operated by the flowing water, which was used to light the burner... yet, no one mentioned them?
>  
> todd
>  
>  
>  
>  
>  
> On Tuesday, October 1, 2013 5:48am, "Bill Loesch" <solar1online at charter.net> said:
> 
> > 
> > Hi Dick,
> > 
> > Following the Carter era oil embargo energy awareness, pilot lights were
> > reduced from ~700 BTU/h to ~ half. In a tank, that heat is put to
> > amazingly efficient use; not so with a tankless.
> > 
> > In places where they take energy usage seriously, the pilot light is lit
> > only when the tankless is going to be used. A piezo igniter is standard
> > on the standing pilot natural draft heater identified earlier.
> > 
> > For all those folks with a tank, using it as a batch heater with the
> > circuit breaker or pilot gas selector also eliminates the majority of
> > standby loss. My pet peeve is folks who unwittingly heat the water well
> > past the using temp and temper it with cold at the faucet.
> > 
> > Glad you are pleased with your tankless operation,
> > 
> > Bill Loesch
> > Solar 1 - Saint Louis Solar
> > 314 631 1094
> > 
> > On 30-Sep-13 7:29 AM, Richard L Ratico wrote:
> > > As concerns standby loss, I can't speak to the others, but the Rinnai has a
> > > simple on/off button on the front of the unit. A remote controller is
> > available
> > > which also provides the switch. It does take afew seconds for the unit to
> > boot
> > > up. Up to three remotes may be installed, making the on /off operation and
> > > temperature adjustment fairly convenient.
> > >
> > > Been using a Rinnai here, on grid for 10 years or so. It works. We like it.
> > >
> > > I understand a pilot uses a significant amount of gas over the course of a
> > year.
> > > Just sayin'.
> > >
> > > Dick Ratico
> > > Solarwind Electric
> > >
> > > --- You wrote:
> > > If its a Rinai, I measured one once that was 30 watts AC standby, and
> > > jumped a bit higher when firing. It also needed pure sine.
> > > The customer swapped it for a regular hot water tank.
> > > Some Bosches and old Palomas, etc. had either a piezo ignition or pilot,
> > > but took no power.
> > > I'm working on a system with one now that needs 12vdc at about 5 watts.
> > >
> > > R.Ray Walters
> > > CTO, Solarray, Inc
> > > Nabcep Certified PV Installer,
> > > Licensed Master Electrician
> > > Solar Design Engineer
> > > 303 505-8760
> > > --- end of quote ---
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