Multifuel burner - how much coal

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Millertime_9

Member
Feb 3, 2020
44
G72 8ax
Evening all
Had a multifuel stove for a few years now and I'm wondering whether I'm getting full efficiency

It's a nestor martin harmony 33

I've got a hold of some proper colombian coal!

Supplier said it burns hot so don't put too much in, so I only maybe put in 5 or 6 lumps at a time
Should I really be filling it though up to the grate height?

I've got a thermometer, IR and flue pipe hits about 250deg celsius, max which I believe is the highest advised for efficiency, so I'm doing it right then and using enough?

Thank you