Hot.
A Quartrzebie™ Portable Quartz Heater provides extra warmth for Roger's quarters aboard the SCS Deepship 86. It consists of a red-hot spike of quartz in a black casing, plugged into a four-socket, recursive-current, subspace-grounded outlet.
The quartz is so hot that according to the Narrator, Roger's hands would be permanently fused to the heater if he were to touch it.