coalkirk wrote:The trusty Harman would have been running balls out struggling to meet the demand. The EFM was just sitting there like is that all you've got?
Remember this thread?
Scottscoaled boiler sizing method
That EFM 520 will do a great job heating your house, and if you want to put on a huge addition or heat the neighbors house, just increase the feed by a few teeth.
I think this is the first winter I have left my 520 on 4 teeth through the coldest weather. Between the insulation improvements I have made and the really good coal, it is doing a fine job. It is pretty dam cold outside right now, and the 520 is shouldering the load just fine.