Drainback vs. Closed Loop Circulators [RE-wrenches]

[Conrad Geyser]

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maybe it's that lower magnetic deviation down there in Virginia....
----- Original Message ----- 
From: "Ken Schaal" <ken at commonwealthsolar.com>
To: <RE-wrenches at topica.com>
Sent: Thursday, June 08, 2006 12:03 AM
Subject: Re: Drainback vs. Closed Loop Circulators [RE-wrenches]


>
> Our large tank DB's of course, only use tap water. Shallow well, deep 
> well,
> city water, ie river. Never had a corrosion / erosion problem on type M
> copper. Oldest systems from '78, still going great. Checked one just
> yesterday when we installed that new TMFR.
>
> Ken
>
> ----- Original Message -----
> From: <solarpro at aol.com>
> To: <RE-wrenches at topica.com>
> Sent: Wednesday, June 07, 2006 9:56 PM
> Subject: Re: Drainback vs. Closed Loop Circulators [RE-wrenches]
>
>
>>
>> Hello SHWrenches:
>>
>> Drainback systems for space heating is very good advice.  Even if you 
>> have
> a
>> "dump" load, pool/spa/geothermal, a closed or 'open' loop system will
> overheat
>> if (WHEN) something goes south.
>>
>> I've never come to closure on one issue re drainbacks - is it better to
> use
>> distilled/de-ionized water or tap water?  I understand that "tap" water
> covers
>> a lot of territory, but the only drain-backs I have had serious problems
> with
>> were systems using distilled water - actual copper tubing failure
> unrelated to
>> erosion corrosion.  I've seen waterways turn to copper foil.  I suppose 
>> it
>> could have been due to high heat in a moist environment but somebody a
> long time
>> ago told me that distilled water is "hungry" and will eat away metals. 
>> It
>> does seem that the best way to resolve this issue is to use a buffered
> glycol,
>> but pump head and heat absorption do suffer.
>>
>> Anybody copy my experience with distilled or de-ionized water?
>>
>> Patrick A. Redgate
>> AMECO
>> Long Beach, CA
>> (562) 595-9570
>> www.amecosolar.com
>>
>>
>>
>
>
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> 


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