Those who said it didn't work..I'm surprized. I actually timed the unit ..when it's too hot to touch..she 's workin..It took mine about 8 minutes to get that hot...but usualy I'm good at 5 full minutes..I will turn mine on about 5 minutes before arriving..
Reasons why it might not be working..
A, The burn pad may be burnt out and ya need to change it..
B, you need to be able to see the little blue /orange flame ..otherwise your unit may not have turned on..I did that once..I thought it was on and it wasn't
C. out of gas..
I hunt in the Florida swamps..we ahve tons of mosquitoes here..I don't get one mosquito buzz after the unit is on for 8 minutes..they all disappear.