Using a hovabator with a thermostat?

[joepythons]

Last year I used a hovabator to hatch out eggs with very little problems. My son and I only have a few clutches to deal with this year and last year (hopefully more for years to come). Anyway at the very least I will need to replace the waffle in it this year (so I have heard), but I have also heard that a hovabator can be operated on a thermostat. How? and what do I need to do toe convert it from the norm?

Why do you need to replace it? If its still able to hold the temp at the correct setting its still working.