• Only really need a low level of heat to keep the damp/condensation out and protects the batteries/electrics etc of the things that are in there.

    Not solar, but there are things call greenhouse heaters. They are little electric bar rads that give of a small amount of heat to combat low temps.

    People also use them to prevent damp and condensation in sheds.

  • You could fit a radiator/towel rail with an electric element in it. We had one in an old bathroom. They are meant to be plumbed to the system, but I just capped the in/outlets and ran it stand alone.

  • Exactly that.

    They just plug in.

    Obviously check the figures on what heat they'll output for the size of your space.

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