Many of the panel heaters are quite economical. I don't know your specific one though. Have you googled the model number to find out how much energy it uses?
I tried, but I can't get to it because it's stuck to the wall

Tanstar, I will google hydronic heaters and try get some info Thanks!

I have noticed this place gets very cold overnight, so I am a little concerned about the nursery. If all else fails, I guess Ill just use a small oil one.