Getting cold so been fireing boiler up. I added storage now 340 Gal. And I found that if I only put about a 3rd. of wood in to get going I get secondarys fired in 6 to 12 minutes, Then after about 15 total I open door [updraft] and the secondary dont even go out, its a loud rocket sound, I add rest of wood and let it go. around 1.2 hour it heats water to 190* from starting with 80* water. This seems to do the trick? I also found if I inject air on both ends of secondarys I get a bigger and hotter burn, NO smoke at all out chimmey.
Photo is added tank water,
Photo is added tank water,