Using an Electric Radiator in a Two-Bay Hobby Tunnel

I have an old-style plug-in electric radiator in good condition. Can I use it in my two-bay hobby tunnel if necessary?

An electric heater of this size may not be sufficient for a two-bay hobby tunnel, but it could be useful for an 8 x 12 feet greenhouse or a larger space with relatively minor levels of freezing weather. However, indoor heaters may not be adequately insulated for use in a damp environment like a polytunnel. It is best to consult with a qualified electrician about the heater and its installation. It is recommended to fit a suitable RCD circuit-breaker at the very least to protect against electric shock.