My thermal flask test thread.

thenewoc said:
@lltfdaniel are you looking for any more suggestions and is it just large flasks you're wanting to test or also travel mugs?

This is my suggestion from when i was researching the purchase of a travel mug but obviously I'm not sure how one of these would compare to others, other than they seem to get favourable reviews.

Contigo West Loop Autoseal Travel Mug
https://www.amazon.co.uk/Contigo-Au...39318560702&ref_=sb_s_sparkle_slot&th=1&psc=1
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Yea i am up for doing more tests and yes any suggestions for testing is welcome.

I am currently looking at 'professional thermometers' or any suggestion from you folks because i need a proper one i think.

I feel that cheap thermometer i used didn't do full justice, not to worry because i can test these again using a proper thermometer and test it outside in a bag as @bainbridge said,

Also a dash of milk test after that, i am roughly thinking 125ml of milk.
 
bazzabear said:
So have we reached a conclusion? What am I best buying to store two cups of coffee and a choc ice?
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To the best of my knowledge a 500ml flask will suffice for 2 cups of coffee me thinks so 250ml in each cup, should be enough, also do you intend to add milk with the coffee in the flask?

Do you want the flask to have a cup or not or will you use a separate cup?

I don't know what would be the best but if you want a good start in the world of thermal flasks the thermos ultimate 500ml flask definitely will be a good start so i would point you towards that.

My 2 pence,

Dan.
 
In my quest for a thermal flask to give the best heat retention,

I have decided to buy one of these > https://www.outdoorwales.net/stanley-master-vacuum-bottle-14qt13l.ir

Why well because it uses quadvac.

From https://www.stanley-pmi.com/blogs/t...rand-introduces-master-series-for-spring-2017

QuadVac™ adds a double layer barrier to the double wall vacuum insulation, locking in heat or cold better than any other technology currently available. The four layers offer protection from convective, conductive and radiant energy transfer creating the highest thermal retention rates. To create the most durable bottle, Stanley Master Series uses 1.0mm thick stainless steel, compared to the industry standard 0.6mm, making Stanley’s construction 50 to 100 percent thicker than others on the market.

It is rather expensive but i have confidence this will be the best flask in my inventory, until i find out by testing it.

Dan.
 
moon man said:
It's amazing, very hot all day long, I'm using it now down in Newquay,, lifetime guarantee, don't even need to preheat milk, love it
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1+

My Stanley classic legend also was nice and hot,

At the 12 hour mark it is hot enough to burn your lip (so it is just like boiling water straight from the kettle) despite fewer c when first put in until 12 hours.

Dan.
 
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Skillmister said:
Please do the tests in the fridge and freezer.

I need a decent flask so will be keeping an eye on this
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If i can find space in the freezer or fridge or the alternative is leaving the flask outside, instead of the fridge but not the freezer.

Also, i will test the flask up to the 12 hour mark, not 24, because for most people 12 hours is ample time for most people as have said and still give you an idea.

When i am ready i will let you know, i will be doing another test indeed, also i will be this time preheating the flask from the start, by filling up fully with boiling water and leave it for at least 2 minutes, then drain and then put boiling water in it again and then start the test.

I will be testing 1 flask which is the Stanley master vacuum bottle 1.3l with quadvac.

If i can find room in the freezer i will let you know and conduct the test in the freezer.

So yea every 6 hours i will check the temperature also i will be using a different thermometer.

Dan.
 
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In comparison to my other tests right, which i did without preheat and leaving them in a room with a temperature of 18c, i will have to test the stanley master 1.3 litre bottle in that condition which is testing it without preheat and in the same temperature conditions so to get a rough idea of how good the heat retention is in comparison to the other flasks that were tested, yea may seem unfair because apparently the more hot fluid the more it will stay hotter.

If i think the Stanley master quad vac is any good and is the best i am considering giving my other thermal flasks away, friends family or people on this thread.

As well as testing the flask outside and in the freezer.

Dan.
 
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AndyCr15 said:
I like this, as it makes them easier to test and as you say, is plenty long enough. I have the thermometer, but I don't think I have the dedication to cut my sleep short to measure temps though :) 12 hours means I can test the two items I have on my day off.
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Let me know what you think about that thermometer, also make sure you leave it in the liquid for at least 10-15 seconds for it to give a correct reading.

Nice to have you on board.

Dan.
 
AndyCr15 said:
Will do. I have a Chilly's to test and a insulated travel mug to try too. Are there any other branded flasks needed doing?
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The 2 top brands i know of personally is Stanley and Thermos and possibly the Zojirushi brand as well and or whatever brand the people here would bring up like the tartan flasks that were mentioned on this thread.

Anyways the more brands we test the more we will know any how, so it is like busting the myth and the more comes to light the better with the results for example the chilly flask you will test.

We will be using this > https://docs.google.com/spreadsheets/d/1r0ZEVhnXF97QpugLyveziQB0vIAPz8T1bz6sRLTNlUE/edit#gid=0

We will have to state the testing conditions like if the flask was pre heated or not or what the room temperature or temperature is etc,

Dan.
 
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Merlin5 said:
I've got a Thermapen 4 (fastest and best thermometer in the world) and a 1.2 litre flask. Are they ok for the test?
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Yeah, in that spreadsheet will have to mention of what thermometer was used.

Just a change of mind, it is contradictory but forgive me, i don't mind at all anyways what i am doing is just a hobby.

@AndyCr15 controls that spreadsheet so you will have to ask him to publish results on it.
 
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AndyCr15 said:
I gave you edit though I think. Either way, post the results here and I can add them in :)



I have one that I will be testing on Thursday if all goes to plan (and I remember to start the test on time).
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I am rubbish with spreadsheets Andy, i need to add a new column specifying what thermometer was used.

Edit,

Thanks Andy!
 
I will retest the sigg and tkpro because of the starting temperature.

I did a stupid newbie mistake, with the ThermoPro TP02S i did not remove the cover so that explains the starting temperature of 93c and 97c.

The only ones i would trust is the ones i am testing in the freezer, so i apologise.

83501672_10157926802052375_5507638019101818880_o.jpg
82527722_10157926802142375_3745393661739794432_o.jpg


I have deleted the rows in the spreadsheet and will retest them tomorrow.
 
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Merlin5 said:
I just dug my 1.2L flask out, fully filled with boiling water to preheat it, then emptied and filled with boiling water again. Ill see what temp I've got at 3.10am, I'll probably still be up. :p Only £15, not expecting amazing temperature maintenance but its certainly kept my water hot enough for a few hours when I've used it.

20200121-211058.jpg


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I start mine ideally in the morning, i will be finished around midnight.

This has ultimately backed me up about the 97c starting temperature, thank you, nice to see my cheapo thermometer gave the same exact reading there...

Nice to have you onboard.

Dan.
 
AndyCr15 said:
As I've said before, personally I would say we shouldn't. More complicated, more variables, more chance for borked results.

I'm not sure why everyone wants 'real world's results. Surely we just need to know which maintains temperature best? Do we really think one will perform better in a test where cups are taken and then perform worse in one they are left closed, compared to other flasks? Surely the performance will be the same? The only reason for real world would be to know what actual temperature it might be after 12 hours, no?
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This is how i casually take it as well Andy, i agree with what you have said, it gives us a good indication i think with how well it maintains the temperature and to give an idea of different variables.
 
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The thermos ultimate 900ml is the one i whole heartily recommend to anyone why well it is smaller in size ( smallest when compared to all of my other flasks) being 900 ml or 500ml whichever you pick and does not cost a bomb for a decent flask and yeah decent heat retention up to the 12 hour mark.

The other alternative is the Stanley legendary classic.

I will test the Yeti flask bottle it is on the spreadsheet and apparently people rave about the yeti and or hyped and is popular from what i have found out, i will find out when i test the Yeti.

I would love to test more flasks but it is getting to a point where i have enough due to the folks here hah.

I would love to have tested the esbit flasks first hand but what i like about esbit is that they have tested their thermal bottles like in the extact same manner as me so i guess i do not have to bother.

Their website is > https://esbit.de/

Nice to have a manufacturer to report the actual temperatures when it is 6h from starting temperature etc instead of saying hot up to 6,12,24 hr etc.

83611853_10157935159602375_7123790803352158208_o.jpg


zojirushi also test their bottles the same as well,

https://www.zojirushi.com/app/product/sjjs scroll down and you will see.

83360724_10157935178057375_1528307710771068928_o.jpg



Dan.
 
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Merlin5 said:
Well my results are in. Not too shabby for a cheap double walled flask. Interesting how it lost 15c in the first 6 hours and only 10c in the final 6 hours. AndyCr15, would you be so kind as to publish my data into the spreadsheet. Thanks. :)

Product: Mountain Warehouse Food Flask
Size: 1.2L
Price: £14.99
Link:
https://www.amazon.co.uk/Mountain-W...ehouse+flask&qid=1579888650&s=clothing&sr=8-7
Tested By: Merlin5
Pre-Warmed: Yes
Starting: 98c
6hrs: 83c
12hrs: 73c
Thermometer Used: Thermapen 4 Pro
Conditions: Room temperature (17-20c)
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Done your results are in the spreadsheet i added it.
 
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AndyCr15 said:
I have the Esbit and Zojirushi Amazon links and will perhaps buy one of these, as at present I don't have a decent thermo flask (just the poor performing Chilly's). I like the design of the Zojirushi but all the reviews say it drips and leaks, so perhaps I'll order an Esbit and test it. I did wonder about ordering both, but I think the Zojirushi comes from Japan and I might end up paying costs on a return.
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That is awesome Andy, i look forward to the result/s.

I bet the Esbit will do the job for you for sure Andy as you say you need a decent flask.

Anyways the esbit if you don't like it then you can perhaps send it back and get your money back, after testing it.

Dan.
 
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