Click here to Find a Contractor in your area.
In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Need to contact us? Visit https://heatinghelp.com/contact-us/.

Bonnet capacity

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 Member Posts: 2,939
    Output

    Bonnet is output
    To learn more about this professional, click here to visit their ad in Find A Contractor.
  • charliechicagocharliechicago Member Posts: 68
    Chimney liner

    So if I replace it with an 80% I don't need a liner?
  • IronmanIronman Member Posts: 3,550
    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 Member Posts: 68
    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!