In a small workshop, the heater can be sited inside the workshop area. A fan and outlets on top of the heater will distribute the heat and a distribution fan is sized to suit.

In a large workshop ducting with adjustable outlets is installed to distribute the heat across the whole building. This ensures an even temperature, without draughts.

To calculate the average heat requirement.
Over a period of time the average heat requirement will be about 30% of the maximum heat requirement; therefore...
     = Total (from above) x 0.3

To calculate the Kilowatts per load.
Multiply the average heat requirement by the number of hours between loading.

How much fuel?
1Kg of dry wood and most other bio-mass fuels will yield 5Kw of energy. Divide your kilowatts per load by 5 to give the kilogrammes per load. Now refer to the table and choose the most suitable model.