This is a big question for me at the moment too.
I am trying to devise a plan to be able to brood batches of 100+ chicks, without electricity.
I'm thinking of making some sort of modified hood for the Little Buddy propane heater.
That's where the trickiness begins. The Little Buddy puts out more than enough BTUs, at an economical enough rate of fuel consumption. It's just a matter of containing the heat without blowing up the heater 😜
Anybody tinker with something like this before?