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.