Patio heaters use an awful lot of power, hence CO".
Most of them burn gas but I have also seen a lot of electric ones. Basically they are stupid because they are heating areas outside!
If you are outside and you are cold put a coat on! or don't go out side.
The heat form the patio heaters is lost directly into the atmosphere. It is not so much that the heat its self will increase global warming its the energy used as well. Its a bit like leaving all you heating at home and your oven on all evening and opening all the windows and doors! crazy
I love being outside - I love having a snug jumper or coat on and being outside...
"You can't just go into any boxing club and pick a winning team"
Flo