If you're looking to keep your valuables safe from fire or water, make sure you buy a safe that is labeled specifically for these purposes. Pay close attention to the fire-resistance rating on any given safe you buy because this lets you know how long the safe can withstand the heat from flames. Some will begin to melt within an hour while others can last up to 4 hours being surrounded by fire. For water-resistance, it is best to keep valuables in a waterproof container within the safe and make sure the safe you buy was manufactured to protect against water damage.