Answer to "How to heat it without Microwave"Under any circumstances DO NOT USE AN OVEN FOR HEATING IOPENER! Heated mine for 15 min at 170 degrees and the thing melted down. I was stupid enough not to check the oven the whole time. The plastic broke and that hot liquid was all over my oven. It may be possible but for future reference 20 min and 170 celcius is way too long.