While assembling my new-to-me DF520 I noticed the coal pipe which attaches to the stoker unit is chewed up, EFM wants $80 for a new one. It looks to me like just a 2" aluminum pipe with some vent holes drilled in it and a notch so it can't spin in the stoker unit. If that's all it is I can buy a thick wall 2" aluminum pipe and drill it for much cheaper, so if anyone has this boiler and can shed some light on the subject I would appreciate it.
That was my question too when i wanted to put an extention worm on my 520. A guy i know did that with aluminum exhaust pipe in about 5 years according to him that the abrasiveness of the coal going uo the tube wore away at the pipe and it collapsed.I would use a thick walled steel or cast pipe. there is no doubt that you can fabricate your own.like you said just make sure the pipe doesnt spin in the pot. p.s. if your putting an extention worm on dont forget that the worm coupler is reversed threads!!!!!!!!!is yours a dual fuel???? i dont remember you saying so? if so pm me and i will e-mail you those diagrams i know efm does not have them on their website
thanks, it has a boss for the oil burner but it's set up as coal only and the oil burner hole is blocked off with a 1/4" steel plate. I have a very thick aluminum pipe I'm going to try to use as the feed pipe.