Re: [pvusers] tankless water heaters

["Dan Metcalf" <dan@metcalfs.com>]

I haven't had hands on with this unit, but I can tell you what I have seen:

Some have a water flow switch that turns on the power to the ignition
system, thus no phantom load.  Some have a transformer with a phantom load
that ignites the unit, giving you a phantom load.

I'd contact the seller to find out about it.  Even if someone has experience
with that same model it might have had some subtle changes along the way.

When I finally make my move to the country I plan to get one of the Aquastar
125 BS units, since it can handle preheated solar hot water and only heat
when that isn't up to par.

Dan Metcalf
http://www.metcalfs.com
"The solar powered home & web site"

----- Original Message -----
From: "Brian McMaster" <bmcmaster@swrpc.org>
To: "'Greenbuilding'" <greenbuilding@crest.org>; <pvusers@crest.org>
Sent: Friday, January 11, 2002 12:07 PM
Subject: [pvusers] tankless water heaters


>
> I'm looking to install a propane-fired tankless water heater in our
off-grid house now under construction. I'm particularly interested in the
the Takagi TK-1 (aka Aquastar 240 FX) because of its high output.  Its
specifications show that it requires 110v ac power, at a maximum of 0.8 amps
for electronic ignition and computerized controls.  Apparently a power vent
exhaust would use additional electricity.   This model is not direct-vented,
so I'll have to supply fresh air for combustion via vents from the outside
or from other rooms.
>
> Questions:
>
> Anyone have experience running one of these off an inverter (a Trace
SW4048 in this case)?
> Are the electronic controls a 24/7 phantom load?
>
> Regarding fresh air supply: I'm interested in feedback on creative ways to
supply that air in hopefully more efficient ways than an open hole in the
wall.
>
> Thanks,
> Brian
>
>
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