Excellent hunting, I think it's wonderful to have hot water wherever we go without the need for fire or electricity, only from the sun, we can use them as many times as we want and keep our hot water for several hours, the coolest thing is it can deanilize the water, I think SUN WATER 100 should be in all boats, this would save many people if they will end up without water suitable for human consumption at sea, great hunting.