In article <502c2acf-a7c4-4474-8aad-023fe9c59a08
@c13g2000prc.googlegroups.com>, says...
>
> Hi:
>
> I?m thinking of hypothetical oxyhydrogen-fired radiant heater in which
> the significant emitter of thermal radiation is the flame itself.
>
Flames themselves are very poor IR radiants,
compared to solid surfaces of the same temperature.

--
Poutnik