Tankless water heater for off-grid solar thermal backup [RE-wrenches]

[Tom Lane, Energy Conservation Services]

TANKLESS WATER HEATERS DO NOT SAVE MONEY -ONLY SPACE GATOR TOM
----- Original Message -----
From: "Brad Bassett" <bsbassett at earthlink.net>
To: <RE-wrenches at topica.com>
Sent: Friday, June 06, 2003 3:09 PM
Subject: RE: Tankless water heater for off-grid solar thermal backup
[RE-wrenches]


> The Rinnai takes 120v AC, runs 75 watts running, 105 watts running w/
> freeze protection (shame on you if you put one where it could see such
> temps), and about 5-10 watts on standby. I've asked and no has found any
> problems disconnecting the AC when not running, so one could put a relay
> in the AC if another control method could be used besides water demand.
> I will be using one for backup heating for both DHW and heat as a side
> arm to a storage tank. It will run only when the circulator is active,
> so I'll turn off the AC while it's inactive. Keep in mind that it needs
> over 20psi pressure and a fairly high head pump if circulating ie: 25ft
> head, 5 gpm for max capability (188,000 BTU). I'll be using a March
> 809HS and using a lot less than maximum capability, which is OK I don't
> need that much heat. It will modulate down to 15000 BTU so will get down
> to about 15-20 F water temp differential before turning off, so as a
> backup to solar in series might be a little problematic at a certain
> temperature range.
>
> Brad
>
>
> Richard L Ratico wrote:
> >
> > Hi Ian,
> >
> > I'm now considering tankless heaters also. Rinnai has a new unit called
> > the
> > Continuum. I'm not sure if it needs AC or not.
> >
> >
>
>
>
> Brad Bassett
> Schott Applied Power
> Tumwater, WA office
> bsbassett at earthlink.net
>
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