Heat Reservoir
crossroads:heat_reservoir
The <item>Heat Reservoir/$ is effectively a heat "battery". The temperature of the <item>reservoir/$ changes <em>extremely/$ slowly, making a <item>reservoir/$ smooth out temperature fluctuations over minutes or hours.
<item><link:heat/cable>Cables/$ can connect to any side, and the <item>heat reservoir/$ keeps its temperature when broken.

This block pairs well with <item><link:heat/solar>Solar Heaters/$ to make them viable at night.