On my oil burner (with on demand tankless, coil). My aquastat reads Hi 200, low 180 and diff of 12. And it seems like when we run the tub, it goes from hot, to warm, then if we shut it off for a little bit, it will come out hot for awhile, but back to just warm.
The temp guage on the boiler, seems to stay around 130 degrees.
But, when I go to my dad's house, he has seem boiler, ..his aquastat is set at Hi 200, Lo 180 and a diff of 10. But, his temp reading on his boiler reads about 175-180.
What should I have checked on my boiler...the company is coming out on Wednesday.