
My test was to install it on a very cloudy day. The sun doesn't break through the clouds at all. After an hour the water was quite hot. I could stick my finger in the water. Since the handle isn't meant to be carried, I used tarred lynx line to tie it to the sling. I wish the instructions stated that the lid is not screwed down; I twisted this suction cup for a long time before realizing it came loose with just a little twist.

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