Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Choosing type of chimney liner based on combined burner/boiler efficiency
I'm about to replace my oil burner with a new gas burner. I have steam heat and a 25-year old boiler, and the exhaust goes up the chimney (all brick, no clay tiles). I understand the importance of getting a chimney liner for gas heat, to avoid CO poisoning. I've read that gas heating with efficiency of 85% or more requires a steel chimney liner (corrosive condensation at low temps), and below 85% a cheaper aluminum liner is ok.
My heating guy says that the new burner is near 90% efficient, but the combined efficiency of the new burner and old boiler is only about 83 or 84 percent. He says that means I can use an aluminum liner instead of steel (and save more than $1,200). That's great news, but need to know that it really make sense to consider the COMBINED burner/boiler efficiency when deciding between an aluminum and steel liner? That is, does the lower efficiency of the boiler really make the flue exhaust hotter than otherwise?</span>