Firebox
crossroads:firebox
The <item>Firebox/$ is the simplest way to produce heat by burning fuel. Any furnace fuel can be used to produce heat at a constant rate.
Fuels will burn for the same time as in a furnace, capped at 4000 ticks (enough for coal or a kelp block, less than a coal block; config controlled).
It connects to a <item><link:crossroads:heat/cable>cable/$ on the top. <thing><link:essentials/circuits#reader>Reader circuits/$ measure the fullness of the input.