Our basic workhorse for hydronic heating and domestic hot water is a Triangle Tube high efficiency on-demand boiler plumbed into an 80 gallon solar storage tank. It's easy to add supplemental hot water like the hillbilly solar water heater.

Some day I'll get my own biochar making boiler, but the shoemaker and his kids' shoes...


You never change things by fighting the existing reality.
To change something, build a new model that makes the old model obsolete.
R. Buckminster Fuller