EDIT: Never mind, first mash went fine. RDWHAHB...
I had been mashing in a 9-gal stainless pot, which also doubled as my brewpot. But I got tired of trying to hold the temp in it. It lost heat pretty fast, and while it's possible to add heat, that requires a lot of monitoring, work, and is generally a PITA.
So after reading all the great results people were having with these 10-gal cooler conversions, I took the plunge. Got the cooler for $40 at Home Depot, spent maybe another $20 on the bulkhead and SS braid. After a little trial and error, got it to stop leaking, and decided to test the heat retention. Used the same test I had done with my SS pot: add 5 gallons of 160F water (starting temp measured after the water was n the cooler), put the lid on, hold for an hour indoors at 70F, and measure the temp again.
The results:
5-gal SS pot, no insulation: lost 8-9 degrees
5-gal SS pot, with homemade insulation blanket: lost 3-4 degrees
New Rubbermaid 10-gal cooler MLT: lost 7-8 degrees
That's right, not much better than the plain old SS pot. That's with no stirring, no removing the lid...nothing. And I've done the test twice, with three different thermometers.
What the heck is going on here? I think the test was a pretty reasonable facsimile of mash conditions (adding grain wouldn't change the thermodynamics all that much...the 5 gal I used was about the same heat capacity as a 14# mash). Just out of curiosity, I ran the test using 3 gallons of water (roughly the same heat as a 9#mash) and lost even more ...9-10 degrees.
Could all the extra airspace at the head of the 10-gal cooler have something to do with this?
Is it possible that the Rubbermaid coolers at Home Depot are spec'd lower, and that's why they're cheaper?
Anyone else using one of these coolers see anything like this?
At this point, I'm wishing I'd saved the $60 (not to mention the time) and put it towards a keggle
I had been mashing in a 9-gal stainless pot, which also doubled as my brewpot. But I got tired of trying to hold the temp in it. It lost heat pretty fast, and while it's possible to add heat, that requires a lot of monitoring, work, and is generally a PITA.
So after reading all the great results people were having with these 10-gal cooler conversions, I took the plunge. Got the cooler for $40 at Home Depot, spent maybe another $20 on the bulkhead and SS braid. After a little trial and error, got it to stop leaking, and decided to test the heat retention. Used the same test I had done with my SS pot: add 5 gallons of 160F water (starting temp measured after the water was n the cooler), put the lid on, hold for an hour indoors at 70F, and measure the temp again.
The results:
5-gal SS pot, no insulation: lost 8-9 degrees
5-gal SS pot, with homemade insulation blanket: lost 3-4 degrees
New Rubbermaid 10-gal cooler MLT: lost 7-8 degrees
That's right, not much better than the plain old SS pot. That's with no stirring, no removing the lid...nothing. And I've done the test twice, with three different thermometers.
What the heck is going on here? I think the test was a pretty reasonable facsimile of mash conditions (adding grain wouldn't change the thermodynamics all that much...the 5 gal I used was about the same heat capacity as a 14# mash). Just out of curiosity, I ran the test using 3 gallons of water (roughly the same heat as a 9#mash) and lost even more ...9-10 degrees.
Could all the extra airspace at the head of the 10-gal cooler have something to do with this?
Is it possible that the Rubbermaid coolers at Home Depot are spec'd lower, and that's why they're cheaper?
Anyone else using one of these coolers see anything like this?
At this point, I'm wishing I'd saved the $60 (not to mention the time) and put it towards a keggle