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I don't know how accurate this is, but when my fire element is high enough it seems I don't drink as much water and I seem to almost be subconsciously apathetic/withdrawn of it.
Though not on purpose of course, I hardly notice it until I realize my water bottle has been empty all day. This also can have to do with activity level. If you're not expending a lot of your body's water through exercise, digestion and frequent movement, etc, then there's no real reason to replenish it or feel thirsty.
Really you can just do an easy test for this, just make yourself drink one glass of water and if it goes straight to your bladder within an hour then your body just simply doesn't need it and you have enough, which is probably why you're not thirsty.
Your body will make you feel thirsty when you need water regardless of the reason, although with the fire element thing this thirstiness seems to not be very strong or noticeable, but when I 'look into' my body I can intuitively tell that it does indeed need water. I'm not sure how to explain this, it would make more sense to be more thirsty if your fire element was too high, not less so. Fire is the opposite of water but I don't see why it would actually repel something like drinking water. Then again I could just be mistaken about the element thing so don't take this one to heart.