Demand heater for SHW backup [RE-wrenches]

[Bill Loesch]

Hi Jeff et al,

You are correct there was a bimetal (no electric required) backdraft damper
that was manufactured in various flue sizes that would "close" when there
was no main burner heat and "open" when main burner heat was present.
Ameritherm was one manufacturer.

If I am remembering correctly, Chuck Marken was involved with the design
(and perhaps more) of one of these units a long long time ago. Perhaps he
can add something to the discussion?

Bill Loesch
Solar 1 - Saint Louis Solar
314 631 1094


----- Original Message ----- 
From: "Jeff Wongstrom" <thirstylake at interbel.net>
To: <RE-wrenches at topica.com>
Sent: Wednesday, August 22, 2007 7:15 AM
Subject: Re: Demand heater for SHW backup [RE-wrenches]


>
>
> Todd,
>
> There once was an automatic draft blocker consisting of bimetallic
> vanes that twisted open and close.  I think  there were some failures
> which either killed someone or freaked out the manufacturers over
> liability issues and so they were withdrawn from the market.
>
> Jeff Wongstrom
> NABCEP Certified Solar Installer
> Thirsty Lake Solar
> 406-889-5324
>
>
> On Aug 21, 2007, at 6:20 PM, Todd Cory, Mt. Shasta Energy Services
> wrote:
>
> >
> > This is true, the standby losses (up to 40%) on a tank style gas
> > water heater are horrible. The whole time the unit is not heating,
> > the convection up the center flue is cooling the tank. I am
> > surprised no one ever came up with an automated draft blocker on
> > these units.
> >
> > Todd
> >
> >
> >
>
>
> --
> [Non-text portions of this message have been removed]
>
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