RE: [pvusers] tankless water heaters

["Mark Vargas" <sharkshockey@mac.com>]

The TK-1 draws 80 watts while running hot water, 50 watts when cooling
the unit, and a 10 watt phantom load.  I am running this with dual 5548
Trace Inverters, however I am grid connected and have not gone off grid
or experienced any black outs since I have had the inverters which were
installed on 10/18/01.  By the way, I tested the TK-1 power consumption
with the Watts Up meter.

--Mark

-----Original Message-----
From: Brian McMaster [mailto:bmcmaster@swrpc.org] 
Sent: Friday, January 11, 2002 12:07 PM
To: 'Greenbuilding'; 'pvusers@crest.org'
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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