Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: Is this green or black?
Document: waste of time. 80 degrees outside, not a cloud in the sky. it took an hour and a half to reach 140, nowhere near boiling. to say nothing of the cheap construction. i don't think this would survive even one backpacking trip. it might be good enough to heat up some ramen noodles at your house if you plan ahead. that's about it. returning it.
is going to have that much of an effect. It certainly does work as advertised...
Yes, this portable water heater worked! Our water reached a scorching 152 degrees in just 2 hours! Yet it is small and light enough to strap to our back pack!
Works quite well, fairly decent quality (room for some improvement for what you pay). This will heat up enough water for two cups of coffee or a nice quick meal (like Mt. House freeze dried type food) or even enough water to 'wash up' if you are out in the woods... I have not had it actually boil water yet, but have not had it out on a day above 70 degrees...
Works OK. Had it in direct sunlight at 85 degree outside temp. After 90 minutes, temp was only 120 degrees. Started with tap water. Would like it to hold more water but that would even take longer. Plastic fairly thin
Whether you prep or camp or get snowed in.. This thing works. Heast enough water for two cups (large coffe mugs) coffee is must in the morning. I wish i could afford a larger one.
We've added this to our 72 hour emergency kit along with all the freeze dried food. I know it won't stay there though. Hubby is an avid outdoors man and I'm sure it will go camping. We'll need another one I'm sure.
Was skeptical but it actually works i put cold tap water in it n it was seriously cold water. Put it outside in the yard with hopes it would not shatter or freeze because it was 22 degrees out. I put it out at 9:30 am checked it at 1:30 pm i stuck my finger in it to see how hot it was it was hotter than a cup of coffee.
Using common sense and reading the directions , I had this thing working and boiling on the first attempt. I've used it in the winter and summer with great results. It will bring you water to a boil but you will need to let it sit and let the sun do the work.
This thing works...once you figure out how to properly open it and prop it open, takes 5 seconds to do...then just sit it out facing the sun and the water heats up great, hot enough to put on dehydrated foods, make coffee, etc. Works like it's supposed to in a nice size thermos.
Answer: no