Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Yessir..... 600 w is serious overkill.

Not as bad as you might think for a 3" x 4" volume of water , 300 watts is a bit anemic , 600watts is more than adequate for this set-up (& I think it could handle it) but would probably crisp The paint in short order , Jensen boilers of this volume can handle this kind a wattage with no problem , but they are nickel plated (not painted) and the heat isn't supplied directly To the firebox as in this special application.