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Old 11-03-2011, 05:17 PM   #1851
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I've made a 5 gallon and 10 gallon rubbermade mash tun and have found that the 10 gallon doesn't hold heat nearly as well as the 5 gallon version. It's not a headspace issue either, I typically fill them to the top with water and grains. The 5 gallon cooler typically lost about 2 degrees during the 1 hour mash and I've noticed the 10 gallon loses a good 6 degrees during a one hour mash. Anyone else notice this?

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Old 11-03-2011, 05:44 PM   #1852
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Originally Posted by bottlebomber View Post
I'm not sure how you guys are collapsing these braids... I've had this thing completely packed several times now, stirring it like a bad boy and the braid still looks perfect. Is it possible that you're smashing the braid with your mash paddle somehow?
I think it's really more of an issue over time due mainly to stirring. My first braid was fine for about 10 brews then started getting all stretched and oddly shaped. It worked fine and I didn't really worry about it. Then one day I decided to change how my braid sat in there and figured I'd get a spring to put in the braid to ensure it'll last forever.
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Old 11-03-2011, 05:45 PM   #1853
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I've made a 5 gallon and 10 gallon rubbermade mash tun and have found that the 10 gallon doesn't hold heat nearly as well as the 5 gallon version. It's not a headspace issue either, I typically fill them to the top with water and grains. The 5 gallon cooler typically lost about 2 degrees during the 1 hour mash and I've noticed the 10 gallon loses a good 6 degrees during a one hour mash. Anyone else notice this?
I lose about a degree in mine (rubbermaid) and I can see that some of the insulation is a little warped. Do you cover your lid with a heavy blanket/couple of towels? I do that every time and the towels actually get a little warm so I assume it makes a big difference.
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Old 11-03-2011, 06:54 PM   #1854
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I have a 10 gallon rubbermaid. I have only done 4 batches in it but have never lost more than 2 degrees over a 60 minute mash. I don't cover with blankets but I am brewing outside in Florida so the outside temperature is relatively high.

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Old 11-04-2011, 02:21 AM   #1855
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I haven't covered my lid with blankets yet. I'll try that next time and may even wrap one around the sides. It's been in the 60s the last couple times I used it. And after only 3 batches, the inside is pretty warped.

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Old 11-06-2011, 05:26 PM   #1856
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I want to build this setup, but with 1/2" fittings instead.

Anybody have a parts list for this? Particularly the O-Ring and fender washers I will need?

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Old 11-09-2011, 03:24 PM   #1857
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Originally Posted by steinsato
I've made a 5 gallon and 10 gallon rubbermade mash tun and have found that the 10 gallon doesn't hold heat nearly as well as the 5 gallon version. It's not a headspace issue either, I typically fill them to the top with water and grains. The 5 gallon cooler typically lost about 2 degrees during the 1 hour mash and I've noticed the 10 gallon loses a good 6 degrees during a one hour mash. Anyone else notice this?
I did a test this past weekend and the 10 gal Rubbermaid lost about 5-6 degrees an hour over the period of a few hours with about 5 gallons of mash temp water. What I found most interesting is that the water near the top was much cooler than water at depth.

Next brew I think I'll do the blanket cover. I also need to look into expanding foam into the lid.
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Old 11-09-2011, 04:26 PM   #1858
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Originally Posted by mistercameron

I did a test this past weekend and the 10 gal Rubbermaid lost about 5-6 degrees an hour over the period of a few hours with about 5 gallons of mash temp water. What I found most interesting is that the water near the top was much cooler than water at depth.

Next brew I think I'll do the blanket cover. I also need to look into expanding foam into the lid.
I think you will find that at least 4 of those degrees were lost in the first 10 minutes, with the other 2 drifting over the length of your test. When I do a mash in this thing after preheating it I barely lose a half degree over an hour. That is strange about the water being cooler at the top, since heat rises.
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Old 11-09-2011, 05:37 PM   #1859
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I think you will find that at least 4 of those degrees were lost in the first 10 minutes, with the other 2 drifting over the length of your test. When I do a mash in this thing after preheating it I barely lose a half degree over an hour. That is strange about the water being cooler at the top, since heat rises.
That is strange, but what I considered was that with half of the cooler being air with an uninsulated lid, I figured heat was escaping out the top more than the sides and bottom. And by cooler, it's no more than a degree. The thing about my tests is that I had that 5 gallons sitting there in the cooler for about 4 hours. It was by no means scientific, but I had just done a brew where I lost about 4-5 degrees over the hour, so I wanted to see what the cooler was actually losing without my interference. Turns out it was about the same.

What I've been doing to preheat is to make strike water and fill the MT for 10-15 minutes.... to then empty it back into the HLT and reheat. I think that's losing me a few degrees right there. Instead, I think I'll leave half the hot water in the MT and reheat in the HLT as needed to bring it back up. Any fine temp control can be done by adding small amounts of hot/cold water, stirring, etc.

Edit: Here's an earlier post where somebody has filled the lid with expanding foam - seems like that + wrapping in blankets helps:
http://www.homebrewtalk.com/f51/chea...ml#post2754307
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Old 11-10-2011, 04:33 PM   #1860
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Originally Posted by AbusedRib View Post
I want to build this setup, but with 1/2" fittings instead.

Anybody have a parts list for this? Particularly the O-Ring and fender washers I will need?
I'm doing one with all 1/2" fittings and a rectangular cooler but I can post the parts list when it's done if that would be helpful.

As far as the washers/o-rings go I'm using the 3/4" ones. I couldn't find the washers in stainless steel so i tried to just use them on the outside but I'm not sure it's gonna work. The size seems right though.
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