Rob is right. We are fortunate to have a tall chimney and a superstore hot water tank.
While our EFM has a tankless coil, we never had a need to hook it up.
EFM's using a tankless coil run differently in the summer than one with a separate superstore. I believe the Honeywell L7224 aquastat will run towards the low limit setting with a tankless coil, as it is just water temperature pulling in the stoker. In a system with a superstore, it runs towards the high limit setting.
In our system, the superstore appears to the aquastat as any other heat zone. When the circulator comes on, the boiler gets ready for a big heat load and turns the stoker on. Since the stoker at 3 teeth is putting out more btu's than needed and it takes a while for the circulator to reheat the superstore, the boiler overruns the call in btu's and the stoker shuts off on the high limit.
While all this is fine and the domestic hot water needs are satisfied, the result is the boiler temperature is near or above the high limit setting most of the time. This leaves little room for the outfire (hold fire fluff) timer to run the stoker.
This may not be the case for people with a tankless coil, running at the low end of boiler temperature.
Because a superstore has a much larger capacity of hot water, it is not bothered by the 5 minutes of the time it takes a fire that has not been "fluffed" for 1-1/2 hrs to come up to full flame output.
With the recent warmer weather, we did have one outfire, so I moved the dump setting to 10 minutes later than the outfire (hold fire fluff) setting. The outfire is 1 hour 30 minutes and the dump is 1 hour 40 minutes. If the boiler is above the high limit temperature preventing stoking through the outfire timer, it will pull on the dump zone for 20 minutes.
We should probably move this thread to the EFM website, no offense to AHS guys.