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Old Boiler, Combustion and Co2
Hi All, I have a Burham boiler that I'm estimating to be from the mid 80's. Up to this point, with maintenance it has worked well. I had it cleaned and at the end of the appt, the tech checked the CO2 reading and he got 7ppm and told me he needed to turn off the boiler and recommended we replace it.
I had another tech from a different company come out today, his first concern was the need for fresh air in order for proper combustion to occur, and he said it is important to keep the small vented window in the enclosed boiler room open, so that the needed air wasn't being drawn from the room, but instead was being drawn from the outside.
This made sense to me, with the limited amount of knowledge I have about combustion. When he took the CO2 reading with the window open it sat between 0-1ppm. He also stated that older boilers may emit a small amount of CO2 over time, due to age.
When I called the first company back and told them the reading was 0-1, they stated it was only because the window was open, bringing the fresh air in, and if we closed the window, the Co2 level would most likely return to 7 or above.
The boiler is located in an enclosed 5 x 10 closet along with a water heater
So here lies my dilemma and questions-
+Is the fresh air from the window required for proper combustion?
+Is the fresh air from the window somehow masking a higher level of Co2?
+Is an older unit with a CO2 reading of 1ppm safe or should it be replaced?
I appreciate your opinions and knowledge!