Well seen!
I am "lucky" to have a 1.5m / 4m terrace where I can put 500kg of fuel, I tried the wood in small quantities it is very expensive and then as I bought myself an old one burns everything quality, at a very low price, I tried anthracite and there, revelation! the ton of good quality costs almost 2 x more expensive (400-500 €) than the products of department store but the coal lasts two X longer!
10kg of the coal merchant - German origin - lasts 16H00!
10kg of South Africa origin? from China? only lasts 9 / 10H00!
In addition, the second generates more ash, so we order from the "little" merchant and we have European quality which heats and lasts and in addition we are delivered to home and in a 10kg paper bag!
And they go upstairs and store everything for you ... any benefit since there is more, no dirty handling, the bag of 10kg returns from the top of the stove in whole, no dust and excellent performance
QED
Meow and best regards