grobinson2 wrote:however the chimney has a 6 foot flue and we have 25 feet of pipe before it goes into the chimney.
I can't possibly see how a chimney that short would perform adequately...especially with that long of a horizontal run.
grobinson2 wrote:Very simular to my settings...Water temp is at 150 - 170 with 10F over/under. Timer is set for 2.5min every 30min
Similar, but very different at the same time. Your low/high limits are too close together, and the timer cycle may be longer than necessary. Start by changing the low/high to 150/200…just like the EFM manual recommends. If the boiler hits the high limit from the timer cycle, cut the timer cycle back to 2 minutes.
With poor draft, you will often be on the edge of overheating the boiler with timer cycles. Solution: Build a tall chimney.