Kettle insulation

Postby AFewTooMany » Fri Apr 28, 2017 19:16

Got a 100 litre electric boiler that isn't getting as vigorous a boil as I'd like. Anyone got any bright ideas in terms of insulation? Really looking for something which can be removed and cleaned

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Re: Kettle insulation

Postby PhatFil » Fri Apr 28, 2017 20:09

For cheap n cheerful check out £shop camping mats and luggage straps, granted the closed cell foam used for the cheap ground mats is easily torn, but its also very cheaply replaced, 2 or 3 mats should provide a good insulating wrap and secured with a couple of wide webbing luggage straps should be simple to remove post boil to radiate off excess heat when your chilling.
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Re: Kettle insulation

Postby AFewTooMany » Fri Apr 28, 2017 20:26

PhatFil wrote:For cheap n cheerful check out £shop camping mats and luggage straps, granted the closed cell foam used for the cheap ground mats is easily torn, but its also very cheaply replaced, 2 or 3 mats should provide a good insulating wrap and secured with a couple of wide webbing luggage straps should be simple to remove post boil to radiate off excess heat when your chilling.

Sounds perfect. Will be on the lookout for them cheers

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Re: Kettle insulation

Postby vacant » Fri Apr 28, 2017 20:31

Hot water cylinder jacket for £9.99. Comes with ties. You can wipe them down and tape together to form a cover or if they tear.

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Re: Kettle insulation

Postby robwalker » Fri Apr 28, 2017 20:44

I'd suggest the same.
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Re: Kettle insulation

Postby HTH1975 » Fri Apr 28, 2017 22:30

What size elements (wattage) do you have? Might be worth installing more powerful elements, or just more of them.

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Re: Kettle insulation

Postby AFewTooMany » Fri Apr 28, 2017 22:33

2.4kw x2 and I boil with the lid mostly covering the top. Sure if I insulate I'll be able to get a decent boil off one element

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Re: Kettle insulation

Postby HTH1975 » Fri Apr 28, 2017 22:41

This calculator is a good indication of the wattage you need for a given volume of water... http://processheatingservices.com/water ... alculator/

Looks like you need around 12kW to heat 100L in an hour.

2016: 330L brewed (72 gallons, over 8 firkins)
2017: 105L brewed
Drinking: store-bought beer as my bar is dry
Conditioning: choc-coffee oatmeal wheat stout, various ciders, cherry 'brett' brown ale, imperial Pilsner.
Fermenting: Bock (6.5%), IPA (5.5%), Pale Ale (4.5)
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Re: Kettle insulation

Postby Jeltz » Sat Apr 29, 2017 00:02

When I did BIAB I would sit it on drywall insulation (like kingspan), use a hot water cylinder lagging jacket and also used drywall insulation on the lid. I used to mash overnight and only lost about 0.5ºC an hour, I would remove the lid insulation when bringing to the boil.

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Re: Kettle insulation

Postby PhatFil » Sat Apr 29, 2017 01:03

using a 98l pot with circa 80l preboil liquor And a hop spider that takes up a lot of surface area i can boil with some ferocity with 1 x element and no lagging..
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with 1 x 3kw and 1 x 2.4kw element fitted i cant say which one was running tbh, but with lagging and partial lidding im sure you will boil with 1 x element ok
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Re: Kettle insulation

Postby AFewTooMany » Sun Apr 30, 2017 21:59

Cheers for the ideas. Only boiling ~60 litres so really want to get it down to one element. Will try to get an offcut of kingspan and a water cylinder jacket and see how that helps

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Re: Kettle insulation

Postby Mr Squiffy » Mon May 01, 2017 08:45

Thermawrap from Homebase, £9.99 for a 7.5m roll, I use a length that will go round the kettle twice.

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Re: Kettle insulation

Postby sledgehammer » Sat Aug 26, 2017 21:00

i have been running a 3.3Kw incaloy immersion heater element in my setup at times if not carefull it can get out of hand on the boil if you leave the lid on the boiler
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Re: Kettle insulation

Postby jaroporter » Sat Aug 26, 2017 22:59

lids help more than insulation. 45L in my mate's open-topped keggle gets only a gentle boil with 3kw. same element in mine that doesn't have the top cut off i can get a roaring boil with less than half that. less boiloff too - generally a positive, though maybe less handy if trying to boil down an imperial stout to target gravity..

what did you go for and how'd you get on OP?
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