Inducer and circulator runs

stampman

For no reason after hot water has been satisfied the circulator and inducer run for a period of time.

Jamie Hall

Many controls are setup with an off delay. Likely yours is. Removes heat from the boiler and puts it somewhere useful

EdTheHeaterMan

Post purge to clear out combustion gasses and possible raw fuel from the boiler to the outdoors where it will pose no safety hazard. That is the combustion fan or inducer fan. That is a safety standard for some equipment. Dont worry about it.

The circulator operating after call for heat is satisfied. Consider this: during a call for heat or DHW the boiler gets up to the limit temp of (lets say) 180°. At the end of that call for heat, the circulator stops. now you have 180° of water in the boiler that is sitting in the boiler that is in a boiler room that is not contributing to the load of the home (or the DHW tank) after one hour passes that wasted heat has now radiated into the boiler room (where no one lives) making the unused space hotter than it needs to be (if a basement, it wasted where no one needs it, if a laundry room then that room gets too hot).

Now if you operate that circulator pump for 3 to 5 minutes, with no flame That 180° may drop to 160° making the DHW a few degrees hotter. that means there is more hot water now as a result of the "post purge" of the heated boiler water. that might make the water heater call for heat 30 minutes later than if it did not have that extra heat wasted in the boiler room.

At the end of the year, add up all those 30 minutes of savings and you could see a noticeable difference in your fuel usage.

I know that is one of several things that make EK boilers more efficient.

I would not worry about it.

stampman

Thank you very much for your responses. I guess I was worried for nothing.