Soil can be mounded against the base of the structure to prevent heat loss and winds from entering. A hotbed, on the other hand, will be located over a bed of fresh manure and soil. Usually a hole slightly wider and longer than the dimensions of the frame is dug to a depth of approximately 3 feet. The frame is then placed over this manure bed. For a 3' x 6' frame a cable rated at 250 watts can be used.
Cables are available in several lengths and wattage ratings.
Lay the cable on the soil at the bottom of the bed and uniformly space it across the bed. This safety device will trip off the circuit when even a small current runs to ground. Contact our office for information on ordering copies.