A tonne of any biomass waste will save at least 450 litres of oil.
An average house needs only a third of a hectare of willow or SRC.
| Number of radiators | 8 | 10 | 12 | 14 | 16 | 18 | 20 |
| Heating with wood | D2 | D2 | D4 | D4 | D8 | D8 | D12 |
Oil seed & bean straw is best, wheat and barley straw is also suitable.
One tonne of straw (20% moisture) should yield 4500Kw and save you 450 litres of heating oil! Dry fuel reduces tarring & gives more heat. (1% moisture loses 1.5% heat)
Throughout a year, a single average radiator will require about 1.5 tonnes of straw.
Big Round Bales will last over 24 hours depending on heat demand.
Heston Bales require D25 to give extra width for loading.
From one tonne of material you will obtain roughly 4% (40Kg) of ash. This ash is high in potash (the alkali - potassium hydroxide) and can be used as fertiliser.
For those wishing to convert from the metric system to the Imperial system, 1 Kw of energy = 3412 BTU's (British Thermal Units) exactly.
| Number of radiators | 8 | 10 | 12 | 14 | 16 | 18 | 20 |
| Heating with straw | D4 | D6 | D6 | D8 | D8 | D8 | D12 |