I am at my wit's end with my Crown Boiler (Model KM BSI241ENPZZPSU). I had a new Crown Boiler installed a few years back , after having another Crown Boiler for 20 years before that.
For the first two years everything was fine. Stable amount of water in the site glass, periodic blowing down, even heat throughout the house.
This winter something changed.
On any given day, I can go to bed or go to work with a normal site glass amount of water and return (or get up) and find the site glass full and poor steam being made, thus uneven heat.
When I go to drain the excess water, I can fill a 5 gallon bucket with no issue. This again can occur overnight or during the course of a workday.
I have experimented with turning off the water feed when I am home to if that made a difference or stopped the excess water. To my nonscientific surprise, I almost never have additional makeup water or a full site glass when the water feed is turned off. I actually keep a stable amount in the site glass as well see no surging. I also have very even heat throughout the house.
I have attached pictures of the boiler and piping.
I have swapped out the two main vents and have not replaced any radiator vents.
It was suggested by a friend to have the low water cut off valve cleaned, but that is out of my area of expertise and comfort.
I want to resolve this as I know from my 20+ years as a homeowner I should not have to dump that much water daily. I just don't want to engage a repair person who will chase an issue and not resolve it quickly.
I reside on the south side of Chicago.
Please share any advice. Thanks in advance.