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Old 05-13-2013, 09:54 PM   #1
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Default Mash tun losing heat

I mash in a 7 gal. round rubbermaid, which has worked really well for about 40 batches. I remember when I got it set up originally I was finding it would hold the mash temp within a degree over an hour. In the last few batches I have been seeing really low numbers by the end of the hour. I try to make sure the temperature is stable before I seal it up, but I seem to be losing 4 or 5 degrees over the course of an hour. So I was wondering, do these things lose their insulating capacity over time and wear?

Is anyone else having problems like this? If so what are you doing about it?

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Old 05-13-2013, 10:06 PM   #2
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I have a 10 gallon igloo round cooler and noticed a lot of heat loss. I initially wrapped the mash tun in a sleeping bag to keep the temperature stable, but I read somewhere that the lids are pretty much hollow so I drilled holes in the top and filled it with foam insulation. My first mash with the insulated top resulted in negligible heat loss over 75 minutes.

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Old 05-13-2013, 10:49 PM   #3
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I have experienced this recently myself, but I am mashing in a rectangular cooler that has a hollow lid that domes up about 4 inches which is where my problem lies I beleive. I have started placing aluminum foil over the top of the mash and that helps quite a bit, but I will be building something identical to jhalloran's tun very soon.

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Old 05-14-2013, 12:21 AM   #4
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Thanks for the idea with the spray foam insulation. How many holes did you drill? And did you have to seal off the holes to prevent them from contacting water or are they ok with that?

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Old 05-14-2013, 12:41 AM   #5
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Maybe don't go all the way through the lid with the drill bit. Probably depends on the size of drill bit. And how many holes your willing to hammer into it. I wouldn't go overbored, swisscheesing it. Hammer in a hole. Go from the there. That spray foam will go far. Comes in a red can. Forgot the name of it. Home depot, Wallmart, Ace, Hell. I'm sure Target may sell it too. Do one hole. That stuff will squirt out the other holes. Plus the hole you drilled. Just a few suggestions. Note, disclamer. 25518 is not a licensed contractor or.

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Old 05-14-2013, 12:58 AM   #6
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Drill the holes on the outside, then you don't need to worry about it touching your mash

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Old 05-14-2013, 01:10 AM   #7
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I will definitly drill from the outside, I was just thinking about the water that might contact the foam when I am cleaning the lid after a mash.

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Old 05-14-2013, 01:21 AM   #8
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Quote:
Originally Posted by jhalloran View Post
I have a 10 gallon igloo round cooler and noticed a lot of heat loss. I initially wrapped the mash tun in a sleeping bag to keep the temperature stable, but I read somewhere that the lids are pretty much hollow so I drilled holes in the top and filled it with foam insulation. My first mash with the insulated top resulted in negligible heat loss over 75 minutes.
This is actually a great idea, I might have to do this too. Thanks dude!
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Old 05-14-2013, 01:29 AM   #9
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If the cooler has gotten water inside the shell and has frozen it can screw up the insulation.

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Old 05-14-2013, 01:41 AM   #10
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Are you talking about the outside wall or the lid?

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