If you use hard wax lubes like I do, a heating base is esential. If you use the soft lubes, you can get by with extenal heat from say a light bulb against the base. The magma heater is very nice becuause it has a thremostat so you can pretty much set it and forget it. The heater that I have is very much like them Magma Engineering heater. Prior to finding my current heater, I used the Lyman heating base. It's very inexpensive, (only about $35 from Midway) but it doesn't have a thermostat. Its slow to heat up, and tends to get to hot. Midway used to sell there own heater that had a thermostat, but they don't seem to offer it anymore. Sometimes you can pick them up on eBay, but your probably better off to get a new one from Magma.
There is a sweet spot for heat,,,different for different lubes, but its nice to be able to set your heater so it will maintain that temperature.