Tuna, I notice that all the tankless water heaters say they need a minimum
of 15 PSI water pressure to operate.
What is the typical water pressure generated by the Surflow or similar 12
volt water pumps in an Airstream?
Must be more than 15 PSI.
Jim Greene
'68 Tradewind #1148
Atlanta
----- Original Message -----
From: "Robert C Townsend" <[EMAIL PROTECTED]>
To: "Multiple recipients of VACList" <[EMAIL PROTECTED]>
Sent: Sunday, March 18, 2001 16:31
Subject: [VAC] Re: tankless water heaters
> seriously, check out the specs on the two takagi units:
>
> http://www.galacticsalvage.com/takagi_specs.html
>
> Jill -
>
> Bottom line on tankless heaters is GPM (gallons per minute) at 'rise'
> (temperature, hot water output - cold water input = rise). The colder the
> input water, the fewer gallons per minute and/or lower the output
> temperature.
>
> I installed the natural gas version of the cheaper TK-1 in my house last
> year. It produces 4.3 (four-point-three) GPM at a normal 'rise'. On
> extremely cold winter days, the GPM went down pretty quickly. Even at max
> GPM, it takes some pretty artful manipulation of the shower controls to
> produce a reasonably powerful hot shower, although i haven't tried it with
a
> real water-saver shower head.
>
> If the TM-1 ('Mobius') - with its 8.3GPM capacity - had been available at
> the time of purchase, i'd have sprung for it, instead. When i build an
> 'ohana unit' over the proposed detached garage, i'll probably move the
TK-1
> over there, and install a TM-1 in the main house.
>
> Note that the various manufacturers make it hard to compare GPM - I really
> researched this last summer - and the Takagi unit is head-and-shoulders
> above the rest, and priced accordingly.
>
> I too noticed the discrepancy between the Paloma unit's contradictory
> RV/Marine applications policy... I expect that this is a simple
> 'butt-coverage'/product-liability issue. Careful installation is the key
to
> maximize performance of any appliance.
>
> For my money, the LPG version of the TK-1 would probably be the
> minimally-adequate unit for hot shower/bathing use. If one digs into the
> Paloma and Aquastar specs, one soon realizes that it would (at best)
provide
> only lukewarm water at a little more than a moderate spray-shower.
>
> Look again at the dimensions of the TK-1/TM-1... they're not that much
> bigger than the weeniest Paloma, when one factors in the clearances
needed.
>
> Another consideration is the burner ignition. In the units requiring a .8
> (point-eight)amp 110vAC power supply, this could be provided through an
> inexpensive inverter on a 12vDC system - it's only on for a second or two,
> when the heater ignites.
>
> Tuna
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