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Old 01-17-2012, 01:30 AM   #1
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Default Pre-heating a mash tun..

Do you pre-heat your mash tun before adding grain and strike water? If so, what kind of MLT do you have, and how do you pre-heat it?

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Old 01-17-2012, 01:34 AM   #2
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I have a 48qt Igloo Cube, and I pre-heat it by adding the strike water at around 180F (if it's cold in the garage). I'll let it sit in the tun for about 10 mins, and it usually settles around 169F to dough in for 154F mash.

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Old 01-17-2012, 01:40 AM   #3
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I just brewed a 1 gallon batch in a 2 gallon cooler mash tun that I put together recently. I preheated it with 160F water for about 15 minutes. I think preheating is probably more important on small batches like this since there is less water/thermal mass to heat up the cooler/valve/stainless braid.

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Old 01-17-2012, 01:41 AM   #4
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Dump in hot water let it sit a few minuets. Dump it out, proceed as usual.

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Old 01-17-2012, 01:47 AM   #5
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Originally Posted by PoppinCaps View Post
I have a 48qt Igloo Cube, and I pre-heat it by adding the strike water at around 180F (if it's cold in the garage). I'll let it sit in the tun for about 10 mins, and it usually settles around 169F to dough in for 154F mash.
I like the sounds of this.. I plan on making a 48qt Cube tun as well!
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Old 01-17-2012, 01:47 AM   #6
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I never understood the point of using separate water to preheat. I just heat the strike water up like 10-15 deg more and let it sit until it cools down to actual strike temp.

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Old 01-17-2012, 01:51 AM   #7
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I never understood the point of using separate water to preheat. I just heat the strike water up like 10-15 deg more and let it sit until it cools down to actual strike temp.
Yeah, I was hoping to avoid using seperate water, too. I just wasn't sure how much the temp would drop after putting it in a room temp cooler.
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Old 01-17-2012, 01:53 AM   #8
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I never understood the point of using separate water to preheat. I just heat the strike water up like 10-15 deg more and let it sit until it cools down to actual strike temp.
I feel heating the water 10-15 degrees more is too much is like a shot it the dark.

My cooler only loses 1-2 degrees in an hour so I don't want to wait until it hits the proper temperature.

I preheat with hot water, dump it out and heat the strike water to the calculated temperature. I have missed at the maximum by 4 degrees high, once.
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Old 01-17-2012, 01:57 AM   #9
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It looks like I need to experiment with some hot water to find the "sweet mark" .. I'll try 10 degrees higher first and see how it does. I don't want to wait forever either.

I'm thinking I could enter the temp of the plastic into a calculator just like you would the temp of grain to see what the strike water would be.

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Old 01-17-2012, 02:02 AM   #10
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If you look into the Igloo Cube, here's the data that I can repeat almost to the degree by now (if I don't change anything drastically):

Mash tun temp: 60F
Grain temp: 60F
Mash water: 4 gal
Grain amount: 10-11lb
Strike water: 180F
Dough-in temp: 169F
Mash Temp: 154F

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