To get email notification when someone adds to a thread you're following, click on the star in the thread's header and it will turn yellow; click again to turn it off. To edit your profile, click on the gear.
The Wall has a powerful search engine that will go all the way back to 2002. Use "quotation marks" around multiple-word searches. RIGHT-CLICK on the results and choose Open Link In New Window so you'll be able to get back to your results. Happy searching!
In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.

Bonnet capacity

charliechicagocharliechicago Posts: 56Member
Hello to all

What does bonnet capacity mean.

I have a friend that wants to replace his forced hot air system that says input 100000 btu bonnet capacity 80000 btu

I know it differs from afue but is this an 80% furnace?

Thanks Michael
· ·

Comments

  • Robert O'BrienRobert O'Brien Posts: 2,209Member ✭✭
    Output

    Bonnet is output
    · ·
  • charliechicagocharliechicago Posts: 56Member
    Chimney liner

    So if I replace it with an 80% I don't need a liner?
    · ·
  • IronmanIronman Posts: 2,096Member ✭✭✭
    Not 80%

    That's not an 80% furnace, it's probably 65% at best. Any thing that would have "bonnet capacity" stamped on it is probably at leas 35 years old, maybe much more.



    A new 80% furnace must have a liner installed with it to prevent flue gas condensation. By the time you pay for that, you could have gotten a 95% one and been better off in most cases.



    Also, a heat loss calculation needs to be done as the old furnace is probably way over-sized for the house and a higher efficiency furnace would have more output.
    Bob Boan







    You can choose to do what you want, but you cannot choose the consequences.
    · ·
  • charliechicagocharliechicago Posts: 56Member
    Iron man

    Thank u for the response. You are right that it's an old furnace as you can see from the picture. I had been told exactly what u said but I wanted confirmation. Also that's a great idea about a condensing unit. But I'm still wondering what exactly does bonnet capacity actually mean. Thanks mike
    · ·
Sign In or Register to comment.

Welcome

It looks like you're new here. If you want to get involved, click one of these buttons!