Its the prototype but he updates the progress weekly and a new video is coming in a day or two. He sells RC sound systems for electric RC planes and is working on this for those planes but being I have both RC planes and Accucraft K-36s I believe that unit would fit in a lot of the G scale models on the market now. Here's a link
Umm.... so he states that unit, which is large, runs for 2 to 3 minutes... in addition to being large, it will need an additional reservoir.
Nice amount of smoke, but the disclaimers are interesting:
I can't promise, when or if this unit will be ready for sale. There is a lot to overcome before I feel comfortable selling it. Even then, the unit will be sold as is, with the understanding of the risks taken by the end customer, and I will in no way be responsible for any fire/damage. I believe I can make it fairly safe, but I can't take all the risk away.
It appears to not have any overtemp mechanism, nor modulation of the fan, although that is in line with what many people are doing now.
Keep us posted, and dimensions would be good... right now it looks too large to fit in most steamer boilers.