When I decide to remove ash from the boiler I try doing it around warmer temps, because I always manage to remove some large coals along with it. Once the ashes reach near the top of the boiler door, and risk raking the back ashes forward causing a huge mess overflowing near the door. Every time I end up with huge chunks of nice burning coals that heat up my burn barrel for days. I use a standard dirt shovel dig inn and just shake to try and get the large pieces to remain. Its a real pain just trying to remove the fine ashes. Does anyone have a better method? I stick to warmer days in the forecast because I seem to loose some of those nice coals for overnight, have to build them back up. Its possible I'm removing the coals too early, but have no other choice as I like to rake everything forward for easy clean out. I would say on average 5 - 6 shovel fulls every 10 days. I have heard, and I don't know if this is true, that ash can act as a insulator and prevent heat transfer to the water box.
Thanks
Scott