tahir
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Why aren't tea urns insulated?It'd make sense wouldn't it...
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Behemoth
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It would but as to why not, I don't know and suspect I will now have a sleepless night full of troubled thought. 
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Róisín
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I spy a new knitting project ... 
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Mrs Fiddlesticks
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s'pose in the same way that kettle's aren't? Tis only a huge wide kettle afterall.
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Bernie66
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Re: Why aren't tea urns insulated? | tahir wrote: | | It'd make sense wouldn't it... |
Too much time on your hands or a very curious mind young sir!
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gil
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Re: Why aren't tea urns insulated? | Bernie66 wrote: | | tahir wrote: | | It'd make sense wouldn't it... |
Too much time on your hands or a very curious mind young sir! |
Or a searing experience...
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tahir
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Re: Why aren't tea urns insulated? | Bernie66 wrote: | | Too much time on your hands or a very curious mind young sir! |
Nah, just thought of the waste incurred by letting all the heat escape.
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dougal
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Well, as with compost heaps, the bigger the scale of the thing, the less (heat losing) surface there is in comparison to the volume (and hence the amount of stored heat).
Tea urns really shouldn't be keeping stuff hot for any great length of time... by tradition tea should be made with freshly drawn (hopefully well-oxygenated) water, and once made shouldn't be 'kept hot' before serving as it 'stews'.
Then there's the question of whether any insulation might make cleaning the thing more difficult, bringing hygene risks.
And then there's cost. Making a 'metal thermos flask' (metal to avoid hygene problems & to be robust) of that sort of size is going to be considerably more expensive. And, from the first point, there's maybe not much saving to be made...
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tahir
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Thanks Dougal, knew there had to be a reason.
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alternative-energy
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In order to use the renewable energy generated through our PV system in a variety of ways we are currenly experimenting with a homemade lagged tea urn.
It has a 1600 watt element and during a sunny day we produce this amount of electricity easily. 4099 watts has been the highest so far.
The urn is lagged with an old hot water cylinder jacket and a fire blanket. The outside of the tea urn can get very hot.
The 10 litres of water boils in about 15 - 20 minutes and then goes into a tick over mode where by it uses 160 watts. We have this set up on a timer which switches on and off every 15 mins. When the tea urn is lagged the water does not have to reboil again using 1600 watts; the tick over of 160 watts is fine to maintain the temperature. When it is not lagged the tea urn a great deal of heat and has to reboil.
OK, this is not the most efficient way to create hot water using a solar system but we create 'boiling' water and its near boiling until we decide to use it for tea, washing up, cooking vegetables, rice etc that evening
If we don't use it all that night it is still easily hot enough for a wash in the morning.
Presently we are being paid 5p per kwh for the elecricity we generate so we are getting paid to make boiling water.... not bad!
Have a commerically available tea urn that's lagged would make some sense to us.
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Lozzie
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That's a TAPIR not a TAHIR 
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tahir
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| Lozzie wrote: | | That's a TAPIR not a TAHIR |
Just had a phone call from someone that called me Tapir
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sally_in_wales
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Its a very sweet tapir, positively cute
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tahir
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| sally_in_wales wrote: | | Its a very sweet tapir, positively cute |
So like me...
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mrutty
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| tahir wrote: | | Lozzie wrote: | | That's a TAPIR not a TAHIR |
Just had a phone call from someone that called me Tapir |
That's not what most of your customers call you 
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mrutty
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All the tea urns' I've seen are insulated and double skined 
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tahir
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| mrutty wrote: | | That's not what most of your customers call you |
No, but it begins with T and ends in r
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Will
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A bit like "terror" or "transistor" or "teleporter" then.
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tahir
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Almost, but not quite
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H.I.S
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They are or they are vacume insulated
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oddballdave
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Re: Why aren't tea urns insulated? | tahir wrote: | | It'd make sense wouldn't it... |
That's why they are!
Oh you don't shop where I do.
There are two sorts of tea urn.
Unpowered - double skinned
Powered - Double skin with insulation between the two layers.
Try your local government surplus store for an ex-forces urn.
Dave
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dpack
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so thats what happened
tea urns deserve lagging .
i need to see that on a bill board
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ellep441
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I am doing a project for my maths degree on whether it is economically viable to run an insulated tea urn.
I agree with the theory of insulation (being a bit of an eco buff) but the question remains
When I search for hot water urns they are generally uninsulated. I suppose this is down to the time the water is kept warm for - perhaps 2-3hrs max
I compare mainly with the hot water cylinders in the house being lagged (a legal requirement) where someone may have the water constantly at temperature.
I am looking into whether it is viable, given the higher initial cost, to buy and run a tea urn that is insulated. My main problems are finding costs to buy the urns - all the priced ones (amazon.co.uk) are not insulated. My fear is that the extra price tag is enough to put off most potential purchasers
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Nick
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They'd also have to be larger or smaller inside, and heavier.
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ellep441
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agreed. Plus the outer skin would have to be coated - which would add to the cost more.
trying to get cost differences is a nightmare
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Nick
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However, you're on Downsizer, where the actual answer to the problem would be that Sally/Mochyn would knit you a giant cover, and Richard would set up a fully grid independent solar system to run it, and harvest the excess heat back into your living room.
And everyone else would make cake to serve with the tea. And MJ would organise it all.
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gardening-girl
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ellep441
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I am starting to think the answer to this question is 42
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Mary-Jane
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And everyone else would make cake to serve with the tea. And MJ would organise it all. |
