I still think the problem has something to do with ash build up or coal dust in the funnel of the boiler. Some of the wood gun users are compaining about puff backs and the only thing that would be similiar is the exhaust funnel of the two machines.
I emailed Darren pictures of my last explosion over a month a go and have yet to hear anything. I think they read the posts more than you think and from a legal standpoint they will not comment. The only way to stop the puffbacks is a complete design change that would increase the cost not to mention the length of time for the UL certification process.
If I could get a new EFM that would put out 260,0000 BTU to heat my shop and home the S260 would be back in Chambersburg at the AHS dock!
We should start a Baro- flue poll and see how many users have replaced flue pipes and Baro units over the puff backs. If your fridge would go in defrost mode every month or two and ruined your food. Or if your stove would just burn a $35.00 ham or turkey for no reason would you put up with it?
Yet we continue to use an appliance that we paid big $$$$ for blaming the coal, draft or the operator for the explosions we have encountered. Man vs the machine....
Not to get off the subject but, I knew a car dealer that was a real overpriced rip off that would continue to have repeat customers . I asked him why the same customers would keep buying cars off him after he would give them nothing for the trades. Also all the cars were always priced way above book value? His answer . "They keep comming back hoping to get even on the next one!" I guess every ton a coal is a challenge!