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jfsp 01-16-2012 02:51 PM

Cheap non-food-grade hot liquid pump options
 
I'm looking for a cheap hot liquid pump that would not need to be food-grade or food safe. The idea is to use this pump to circulate hot water in my wort chiller in the mash tun to allow me some control on the temperature of the mash without using a direct electrical element in the MLT. This way, I'd have a greater surface area contact to the hot copper coil and I wouldn't be afraid of scorching the mash.

If car radiator pumps weren't belt driven, the scrap yard would be my first destination. I wouldn't put more then 50$ on this project, so forget the new Marsh pumps.

Any idea where / what I should look for ?

Lennie 01-16-2012 02:55 PM

You could investigate the Harbor Freight 12V utility pumps, two models under/at $50. They are direct drive and the pump housing is brass, although the impeller is no doubt plastic so I don't know for sure what the temp rating might be.

jfsp 01-16-2012 03:25 PM

Quote:

Originally Posted by Lennie (Post 3670768)
You could investigate the Harbor Freight 12V utility pumps, two models under/at $50. They are direct drive and the pump housing is brass, although the impeller is no doubt plastic so I don't know for sure what the temp rating might be.

The price is right, but I'm having doubts it could handle the 170F max temperature i'd like to circulate in it. The pump you linked to didn't give any operating range, but I found a similar product (Pony pump, but not on LG website) that was rated to 140F

jfsp 01-16-2012 03:51 PM

How about this metal drill pump ?

No specifications of course, but this might be my cheapest option for now. Metal housing means i don't have to be afraid of the enclosure melting down, but I have no idea what the impeller is made of. My only fear would be to burn my DeWalt drill after 1 hour of continuous usage.

audger 01-16-2012 04:13 PM

the temperature rating on magnetic drive pumps espeically, and also direct drive pumps to a lesser extent, exists because the magnets in them lose their power over a certain temperature. a pump rated for 140*F wont melt at 160*, but the temperature will decrese the power of the motor eventually to the point where it will no longer turn.

a drill pump, which has no internal magnets, will withstand any temperature up to the point where the actual materials start to degrade.


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