potable vs non potable pump?

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Old 04-15-03, 03:44 PM
renes
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potable vs non potable pump?

I've got some pex tubing in my garage pad and want to pump some hot water through it to heat the garage. I've played around with heat exchangers, but can't get enough heat exchanged. I want to abandon that idea for now and try to pump the water from the hot water tank through these pex pipes. This was suggested to me by a plumber who installs these systems. The only problem is I don't have a bronze or stainless circulator pump. The plumber doesn't think it is a problems since any rust build up will just be flushed through the system either through the taps or the drain valve on the hot water tank.

Is the plumber correct in saying it is safe to use this pump (I believe it is a cast housing). A store that sells pumps says I should use a pot-able pump, but how do I know he isn't just try to make more money from me. This pump might not be a permanent solution for me, but I sure would like to try this idea for a while and see how it all works. What do you think? Thanks.
 
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Old 04-15-03, 05:41 PM
J
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If this is connected to household hot water heater you better make sure whatever you use is suitable for potable water. You don't want to contaminate your water supply.
 
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Old 04-15-03, 06:31 PM
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I would not suggest using an iron body pump. It will self destruct from the oxygen. Just buy a bronze pump. They are around $120. You can always use it in place of an iron pump just not the other way around.

Ken
 
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Old 04-15-03, 10:21 PM
renes
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The plumber I talked too actually said something about oxygen not being a factor in this system so the pump would work fine. I wasn't really paying attention though so I can't remember what explanation he gave.

What do you mean it will cause it to self destruct? Can I try the idea out for a week or so?
 
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Old 04-16-03, 05:11 AM
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I have seen pumps on closed loop systems that had no oxygen barrier on radiant tubing. They in 2 or 3 years look like the bottom of a ship in the atlantic. They get all kinds of corrosion inside the pump body and the water turns a brownish ugly color. Some actually rusted through. You can go ahead and try it. I have no idea why your plumber says there is no oxygen in fresh water. When we fill a heating system, there is always air that gets released from the water in the first few days. You will have that constantly. If you have the pump already, try it and see what happens.

Ken
 
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