Lowtech Graph
Heat
Thermal energy, any source
Produced by
South-facing glazing sized for winter gain
Exposed thermal mass (masonry, rammed earth, slab)
Wood stove / mass heater
Heat pump (air- or ground-source)
South-facing attached sunspace / solar greenhouse
Mechanical ventilation with heat recovery (MVHR)
Wood cookstove
Solar cooker
Active compost pile
Water-based thermal mass (drum / water wall)
Rocket mass heater
Decentralised single-room heat-recovery ventilators
Greywater heat recovery (drain water heat exchanger)
Rocket stove cooker
Household anaerobic biodigester (biogas cooking fuel)
Induction cooktop
Haybox / retained-heat cooker (fireless cooker)
Micro-gasifier (TLUD) cookstove
Motorized heliostat mirror (north-facing daylighting)
Slate-clad solar air heater (wall-mounted thermosiphon collector)
Solar-powered insulated electric oven
Consumed by
Exposed thermal mass (masonry, rammed earth, slab)
Compost-coil water pre-heater
Electric or heat-pump water heater
Water-based thermal mass (drum / water wall)
Haybox / retained-heat cooker (fireless cooker)
Wood-stove flue water heater (thermosiphon coil)
Ground-coupled hydronic cooling loop (buried pipe + radiator)