Your equipment is designed to be outdoors. The heat from the sun will not cause an issue. Your car has the same issue. Do not install any kind of insulating blanket or shade to the heater itself. If you want to shade the equipment be sure that anything above the heater is at least 4' above and non flammable/meltable. If your heater is fan-induced (blower), check the owner's manual for clearances.
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