I was told that pre-heating natural or LP gas will increase the BTUs and decrease the gas usage. I got to thinking that if I run the gas pipes thru the heating ducts the gas will be heated as it is used. I know I can run the pipes, but is it legal to code? According to the length and path of my gas pipes and ducts, I could run at least 80% of all gas pipes inside heating ducts.
Joe Homeowner