Tube heaters

def mount on boards - if you see these installed in outdoor toilet blocks (a favourite location) you'll see the scorch marks on the wall where they have radiated heat over time .... replace the board easy enough ....
 
Since its an engine compartment that you are interested in heating I would go for a 60 Watt tubular. My mate has a Hunter Horizon with one in the cabin and its always warm and dry for minium cost.
 
I recant. I am wrong. I deserve to be banished. Even at the 180W my heater draws, and even at the price the yard sells electricity, a time switch or thermostat is not cost effective!
 
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