I also agree and recommend what the other AA and AHS guys say, but with a couple notes. IF you are using a domestic hot water coil, you are NOT able to modulate the demand like early showers.....laundry......dishwasher and the typical early in the day demands for heating. As I always say, you HAVE to give serious thought to using an indirect water heater and or larger tankage.
With solid fuel; especially coal, you create that early morning demand so the boiler is running full tilt for a couple hours, then all of a sudden, you have NO demand and a runaway freight train snortin' and jumping wanting to take over the world. This is where I interject: Please add more expansion capacity immediately, AND check the damned tank or tanks daily because they can and do fail without visible signs. Those of you who don't respect the knowledge Sting offers for free: shame on you"
I understand money is tight for everyone, but look on Craigslist or local papers and keep an eye out for indirects that have been removed in favor of some dinky instant hot water gas rig.
I do run the temps on my AA's at 180/165 in the winter and now 165/145. 40 gallon Indirect in place, 12 years now. Dump zone in place........and It is a waste to have to run a boiler at 180/165 all summer if all you are doing is heating water. However if the demand is huge for the domestic hot water cycle, give some thought to dedicating or creating a dump zone for this very issue. Also, set the overtemp aquastat up to 210, because when the timer is overridden, an out-fire is the possibility. As Sting tries to educate folks about 'running' your system is about balance, of the entire system. The 'Jackrabbit starts and demands' need to be slowed down and managed smoothly. Functioning from 'Panic Mode' creates more panic and more situations beyond our control.