Check out any good gun shop or on-line gun accessories site (Caballas,
e.g.) They have small, cylindrical heater units for gun safes. Mine is
about 5/8 diameter and.. maybe 7 inches long, 115v.

TOM HOKE wrote:
WANTED: 117 vac dampness chaser. These units are low wattage heaters
mounted under a chassis to keep the dampness out. usually in the form of a
cylinder around 10 inches long 3/8 in diameter. Tom K6XD good on QRZ.