Did I miss it or is there no minimum run-time timer? Say1 minute every 30 minutes....I quickly read the last few posts, and all would seem well, however I would also ask:
Is there outside air or enough interior air available to run this rig?
AHS 130.'never have outfires in my experience, and run very well year round. I was wondering how your timer is set up. Ashing would bee in the ballpark, so I'm still caught up on the run-time timer.....
If you went from a 30 to a 60 Extrol, you might need a 105 floor mounted expansion tank.
Plumbers do not seem to understand that solid fuel appliances do continue to make heat 24/7 unlike oil or gas that cuts the fuel when the aquastat is happy.
You can fix broken, you can fix worn out, you can fix undersized, with enough cash you can even fix UGLY, but you CANNOT fix stupid at any price!
Please stay far from those whom seem to lean that way.
One other thing to look more closely at would be boiler temps in the oil or gas secondary you created. I don't know you lifestyle, but keeping the temps at 180 in the coal and a little less in the secondary may be causing some 'hot suppers'.