I would set the aquastat as EFM recommends. How do you have the controls setup? Does the boiler run up to the high limit whenever one of your thermostats calls for heat? Do you have a timer installed?Becker wrote: ↑Tue. Feb. 25, 2020 9:09 pmTo Rob R.
The boiler is in the house. I do clean those back plates at least once a year. The teeth are set at 4; the air is at 4, as you suggest. I have the aqua-stat set at 165/high and 150/low. I will bump it up if you think that might be the ticket to more efficient burning. The ash ring and fire appear to be correct.
A baro installed on the flue pipe will regulate the draft. If you have strong draft or live in a windy area, the excess draft will burn coal whether you need it or not.