Above-ground or buried tank storing propane or heating oil, refilled by tanker delivery, far higher energy density and no manual processing (splitting, stacking, seasoning) compared to firewood, and burns on demand at a steady, controllable rate. Trade-off: depends entirely on an external delivery supply chain and combustion appliance, is a non-renewable fossil fuel, and the tank/fittings need periodic professional inspection.
Note: Cost, carbon and footprint are rated against the other options for this same need, not in absolute terms.
Space for tank siting meeting fire-code setback distances, and access for tanker delivery
No sizing or quantities: how much a technique yields, and how much a household needs, both depend on the build and the people, so the catalogue compares options rather than dimensioning them. It carries no bill of materials and no build sequence, and it is written for an oceanic, clay-soil climate (Normandy, France). Regulatory notes are indicative and need confirming locally.