Propane heat also has created-in security Homes: It won't ignite when combined with air Unless of course the supply of ignition reaches 940°File. Propane fuel is non-toxic, creates small emissions and isn't unsafe to soil or drinking water. Much better to the Earth than gasoline 80% significantly less dirty emissions https://hydrocarbonheatpumps56788.ltfblog.com/28674431/rumored-buzz-on-industrial-waste-heat-recovery