I'm not really sure if there is "less" heat in the coals or if there is just a problem with oxygen distribution in the coal bed.
I find that stirring the coals a bit with the fire poker settles the ash and the coal bed jumps to life. That said I do notice more heat when the firebox is full.
I find that stirring the coals a bit with the fire poker settles the ash and the coal bed jumps to life. That said I do notice more heat when the firebox is full.