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My thermal flask test thread.

Discussion in 'General Discussion' started by lltfdaniel, Jan 17, 2020.

  1. lltfdaniel

    Wise Guy

    Joined: Feb 23, 2009

    Posts: 2,195

    Location: Bournemouth

    Anyways that is my mission for this test to be transparent as possible and for people to know which flask to get.

    So food for thought, i am up for doing all sorts of tests to see what flask or whatever is best for this or that, like storing hot food how long it lasts but yea obviously you don't put food in a flask hah, but one designed for storing food though.

    But first will be the boiling water test.

    I bet the thermos flask will be first but will know from the test results.
     
  2. Yadda

    Mobster

    Joined: Nov 19, 2009

    Posts: 3,277

    Location: Baa

    And there's how much heat the contents lose when a flask is opened. That's an important factor for those who regularly top-up their cups.

    I appreciate this is quite an undertaking though and agree that testing at full capacity with boiling water is a good starting point. I'm surprised there aren't websites covering this already.
     
  3. ^JP^

    Mobster

    Joined: Mar 13, 2004

    Posts: 4,244

    Location: Norwich

    What about soup, would you test a chicken noodle vs a pea and ham hock?

    Would be very interesting to see the results.
     
  4. lltfdaniel

    Wise Guy

    Joined: Feb 23, 2009

    Posts: 2,195

    Location: Bournemouth

    Right well i will start my 24 hour test run with boiling water, i'l be testing 4 flasks because about 5 minutes ago the rest of what i needed has arrived as with the picture below.

    Going to have to remove the paper instruction thingy in side the flask i think.

    [​IMG]

    Edit

    Ready to go

    [​IMG]
     
    Last edited: Jan 18, 2020
  5. AndyCr15

    Capodecina

    Joined: Apr 28, 2011

    Posts: 10,182

    Location: London, UK

    Okay, assuming you'll give us a running commentary, we'll see you in 6 hours!!!!
     
  6. bainbridge

    Mobster

    Joined: Dec 9, 2009

    Posts: 3,370

    Location: Bristol

    Did you warm the flasks first?

    A quick swish around with about a cups worth of hot water, when you tip it out it's surprisingly cool.
     
  7. lltfdaniel

    Wise Guy

    Joined: Feb 23, 2009

    Posts: 2,195

    Location: Bournemouth

    Sigh no i didn't do that, i will have to do another 24 hour test but with the flasks heated as you say if requested.

    Anyways it will still give us a good idea on how good the flask is which was not heated though (i hope), to be fair all the flasks i test were all cold and all of them had the same starting temperature when i filled them all with boiling water.

    I will give my results very soon now for the 6 hr test.

    Dan.
     
    Last edited: Jan 18, 2020
  8. lltfdaniel

    Wise Guy

    Joined: Feb 23, 2009

    Posts: 2,195

    Location: Bournemouth

    nvm i will give results when the 6 hr mark is upon us.
     
    Last edited: Jan 18, 2020
  9. lltfdaniel

    Wise Guy

    Joined: Feb 23, 2009

    Posts: 2,195

    Location: Bournemouth

    -
     
  10. Blackjack Davy

    Mobster

    Joined: Aug 16, 2009

    Posts: 3,345

    Once I went stainless I never looked back! Never go for glass they always break. Fall out your bag... break. Slip out of your hand... break. Roll off the car seat... break. Titanium... meh. Get a Thermos as a minimum avoid the cheapo no name brands the metals thin and the plastic cup liner falls out or cracks easily once the cups had it the flask has pretty much too.

    I find once they get to that state the milk in the tea goes wierd if you leave it for any length of time, coagulates into lumps and separates out. Not pleasant.

    Tablespoon of washing powder in the bottom, fill with boiling water give a good shake and leave to soak overnight and she's be right as rain. Rinse out throughly afterwards unless you want tea that tastes of soap.
     
  11. lltfdaniel

    Wise Guy

    Joined: Feb 23, 2009

    Posts: 2,195

    Location: Bournemouth

    Ok here are my results for 6 hours thus far.

    From start 0 hours in all flasks the water was all 93c

    Now 6 hours later the results are below and it is a close one so far.

    And all flasks started cold

    1st place is the thermos ultimate (900ml) at 87c
    2nd place is the stanley legendary classic bottle (1 litre) at 85c
    3rd place is the klean tk pro (1 litre) at 83c
    4th place is the sigg hot and cold (1 litre) at 80c.

    Next up will be around midnight for the 12 hr test.

    Dan
     
    Last edited: Jan 18, 2020
  12. danoliver1

    Mobster

    Joined: Aug 24, 2005

    Posts: 3,010

    Location: MANC-chester

    How does the thermos know when to keep hot things hot and cold things cold. Its witchcraft.
     
  13. Street

    Sgarrista

    Joined: Jan 17, 2005

    Posts: 7,527

    Location: Liverpool

    There's a switch on the bottom. It's a pain when you leave it on cold and fill it with coffee, you only make that mistake once though!
     
  14. [FnG]magnolia

    Pancake

    Joined: Aug 29, 2007

    Posts: 26,291

    Location: Bees.

    Doesn't a smaller volume lose heat more slowly? What I mean is that 900ml (first place) compared to 1000ml (all others) seems to have an advantage.

    caveat: physics and chemistry and I don't get along so this might be utter nonsense.

    e: more importantly, this is the best thread OP. Love your work x
     
    Last edited: Jan 18, 2020
  15. builder22

    Mobster

    Joined: Dec 14, 2005

    Posts: 2,802

    think it's like if you make a big cup of tea it stays warm for longer than a small cup....more hot stuff to stay hot!
     
  16. UnLuckyBenski

    Mobster

    Joined: Dec 28, 2017

    Posts: 4,057

    Location: London

    Not sure if the physics checks out but I fancy a big cup of tea now!
     
  17. Yadda

    Mobster

    Joined: Nov 19, 2009

    Posts: 3,277

    Location: Baa

    Yes, that's right. A big cup of tea (or flask) will have a greater volume to surface area ratio meaning it will cool down slower than a smaller cup of tea (or flask).
     
  18. [FnG]magnolia

    Pancake

    Joined: Aug 29, 2007

    Posts: 26,291

    Location: Bees.

    Does that mean that the Thermos Ultimate is over-performing given it's at a disadvantage regarding volume and heat retention?
     
  19. Yadda

    Mobster

    Joined: Nov 19, 2009

    Posts: 3,277

    Location: Baa

    Yes, it would appear so. They are all fairly similar shapes so nothing to suggest the others have a disproportionally greater surface area.
     
  20. moon man

    Mobster

    Joined: Nov 17, 2003

    Posts: 2,731

    Location: St Breward Cornwall

    Ive already said my stanley is amazing and a lifetime guarantee but there is room for a little improvement as i can feel a little warmth through the screw stopper thingy ,still gives me hot tea after many hours ,just saying ,for ultimate