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The heat loss would definitely be my main issue with those. Though I go a bit far the other way in that I boil water, pour it into my gooseneck kettle, then pop that on the hob to get the water back to boiling to ensure there's no thermal loss to the kettle itself. Then again, I guess the plastic doesn't soak that much heat.
mmccarthy-
The plastic got pretty hot tbh. I don't bother with a temperature controlled kettle or anything, I usually let it boil, turn off, and give it 20 seconds to cool a little but with this I just poured it straight in to the Hario. Also I boiled more water than needed so I could top up the Hario, I figure the less water in it the quicker it'll cool.
If I end up using slightly too cool water I'm fine with that cos it means I can drink it quicker.
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Didn't that James Hoffman review show that heat loss was worse transferring into a gooseneck than the air kettle? Personally I've never understood the need for a gooseneck as a normal kettle works fine. I understand in a shop where you're pouring hundreds a day but I've already got too much crap and I definitely don't need two kettles in my life.
Sumo
Gewürzt
I got one of those Hario Air Kettles and used it for the first time today. I'm pretty impressed with it. I've used but not owned a pouring kettle before because I've always made do with a normal kettle, trying not to accumulate too much "coffee stuff". I'm pretty impressed, it pours really nicely, the lack of lid and watching steam escape feels a bit wrong but also the lack of lid means it fits better in the cupboard.