Can I use the Pyroweeder in a Caterpillar Tunnel or hoop house? Should I be concerned about the pyroweeder melting my tunnel? What are the dimension comparisons between the 30 inch and 48 inch Pyroweeders? What is the BTU output? What is the PyroWeeders function in weed management? Where can I get a manual for the Pyroweeder? Why is my Pyroweeder dropping pressure?