Glow ignitor, take your pick.

http://www2.towerhobbies.com/cgi-bin...or&FVPROFIL=++

Besides these few there are many more available. I have a few & just the other day bought the kind you're talking about that plugs into my power panel. I kind of like it better, especially on a cold morning bcause you can adjust the heat from the meter on the power panel. My engines were starting up faster with that little extra heat. Just keep it in the green zone & out of the red, I assume that might burn up a good plug. I don't know that for sure but the fact that it is red leads to me to believe I'd be getting out of the safe zone. But the top half of the green zone was firing them right off.