A heating solution that works well for a temperate climate like the Netherlands is the biomeiler. Instead of heating a building by burning wood in a wood stove or pellet stove, wood chips are composted to generate warmth. Typical floor heating pipes run through the biomeiler and are connected with floor or wall heating in the building, delivering a constant 50º C. To make a biomeiler, wood chips are piled up and soaked in water (50% of total biomeiler volume), with water pipes running through the biomeiler. You could harvest a continuous 40-60 W per m3, or about 1 kWh per m3 per day for your building without burning wood. The biomeiler can give this heat for about two winters. The leftover compost can be used in the garden. There are a few things to be aware of:

1. 1) acquiring or making enough wood chips
2. 2) rainwater storage or reachable surface water
3. 3) available space outside for a compost pile
4. 4) time to redo the biomeiler every two years