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Old 06-21-2016, 11:45 PM   #1
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Indirect tank plumbed backwards


I had a new boiler and indirect water tank installed about 6 months ago. I just noticed the tank has stickers saying "To boiler supply" and "To boiler return" and tracing the pipes back to the boiler they're piped backwards.

How much efficiency is lost this way, or why is the hottest output from the boiler supposed to enter the higher port on the tank and coolest exit the bottom?

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Old 06-22-2016, 05:15 AM   #2
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Re: Indirect tank plumbed backwards


Hot water is drawn from the top of the tank, so that is the portion you want the hottest.
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Old 06-22-2016, 07:43 AM   #3
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Re: Indirect tank plumbed backwards


Normal tanks the hot water is drawn from the bottom and cold enters the top.
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Old 06-22-2016, 08:00 AM   #4
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Re: Indirect tank plumbed backwards


Quote:
Originally Posted by joed View Post
Normal tanks the hot water is drawn from the bottom and cold enters the top.
Not in any water heater I have ever seen. It would defy the laws of physics: Hot water rises.

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Old 06-22-2016, 08:27 AM   #5
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Re: Indirect tank plumbed backwards


Let me clarify, I'm only referring to the indirect part. Here's a picture better explaining it. The domestic hot/cold are fine it's the plumbing to the boiler. Here's an image to show how it was piped, which is opposite to the instructions & stickers on the tank, and every indirect water heater instructions I've seen. It works, I just don't know the effects or how things are better if plumbed the other way as the instructions on the tank say.
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Indirect tank plumbed backwards-boiler.gif  
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Old 06-22-2016, 09:02 AM   #6
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Re: Indirect tank plumbed backwards


I understood your original question. Since the hottest water is at the top of the tank, you want the hot source from the boiler closest to the top of the tank. That being said I am not sure if in an indirect heating application that it would make a great deal of difference. But since you paid to have it installed I would want it corrected.
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Old 06-22-2016, 05:11 PM   #7
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Re: Indirect tank plumbed backwards


Your right. I got that wrong. The cold water goes in the dip tube to the bottom.
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