Kw to boil 100 litres

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Secla
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Kw to boil 100 litres

Post by Secla » Mon Jul 02, 2018 9:34 pm

I know there's probably a lot of factors to consider, but is it possible to get 100l to the boil with 2x 3kw elements ?
Last edited by Secla on Mon Jul 02, 2018 10:06 pm, edited 1 time in total.

jaroporter
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Re: Kw to boil 100 litres

Post by jaroporter » Mon Jul 02, 2018 9:39 pm

yes, and yes
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Re: Kw to boil 100 litres

Post by ciderhead » Mon Jul 02, 2018 10:53 pm

I can get a good rolling boil in an insulated pot using 2 x 2.7s

Secla
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Re: Kw to boil 100 litres

Post by Secla » Mon Jul 02, 2018 11:14 pm

good to hear, i was trying to boil just over 50l in a un-insulated keggle with a 3kw element the other day and it was really struggling, i`l try some insulation around the 100l pot

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Kev888
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Re: Kw to boil 100 litres

Post by Kev888 » Tue Jul 03, 2018 8:43 am

Due to the area:volume ratio being different, a 100L pot won't lose twice as much heat as a 50L pot, so the power requirements aren't as much more as may be expected, certainly not 2x. Insulating the walls can reduce that difference significantly too, so is well worth doing.

FWIW I used to get a sufficient boil in 100L (post-boil volume) with a single 3kw element (thats all the garage power supply could handle) - even in an unheated garage in winter. Now, I wouldn't actively recommend this (something like 5kw is 'much' more suitable), but it illustrates what is possible with insulation and partial (not full!) covering with the lid.
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simon12
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Re: Kw to boil 100 litres

Post by simon12 » Tue Jul 10, 2018 9:36 pm

I briefly half owned a 1BBL brewery and the 200l very well insulated boiler had 2 x 3Kw elements only 1 was needed to hold a rolling boil but even with 2 it took ages to get there.

Secla
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Re: Kw to boil 100 litres

Post by Secla » Tue Jul 10, 2018 11:26 pm

yeh i got there eventually with 50l on 3kw but i had to close the door to stop the breeze and keep the lid on until it got to the boil

Fil
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Re: Kw to boil 100 litres

Post by Fil » Wed Jul 11, 2018 5:44 am

fwiw when using a large grain bag hop spider which occupies a significant area of the surface of my 100l (98l) stockpot kettle i can maintain a good boil with a 2.4kw element with an 80l brew, i do have a 3kw and 2.4 kw elements fitted and use both to bring the wort upto boil as quick as possible, But once going the smaller powered element is sufficient to keep the boil going with ambient temps circa 15c..

a SS bowl floated in your kettle can be a cheap n easy way to reduce surface area and increase boil ferocity on the remaining surface (same heat escaping from a smaller surface) tho if you have a kettle lid, partial/majority lidding is the KISS/best solution ;) As long as there is some vent you should expel all dms pretty quickly..
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HTH1975
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Re: Kw to boil 100 litres

Post by HTH1975 » Thu Jul 12, 2018 7:41 pm

This is well worth a read... https://elementsofheating.wordpress.com ... n-heaters/

You have two considerations - how fast you want to bring a volume of liquid to the boil, and the wattage required to keep that volume of liquid at a rolling boil.

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