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Old 10-15-08, 09:55 AM   #8
Daox
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I just checked out your spreadsheet for calculations. What efficiency does the sheet use for the heat exchanger? There is a pretty large variance between the different models avaliable.

Here are also two more companies that make them.

RenewABILITY Energy, Inc.

ReTherm™ - Drain Water Heat Recovery Solutions
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