* The system doesn't have a separate supply stream -- it takes oxygen from the flat.
An CO sensor seems obligatory to me:
after the chemney sweeper (obligatory in Germany) measured 10,000ppm CO in the exhaust stream (defect, not normal operation), I didn't want to depend on a 25y+ boiler's electronics alone.
CO kills relatively fast.
Even if rare, I don't want to die caused by a rare event that could have been avoided by spending ~50€ (here)
* The boiler's flame is visible (through a slit).
* The system doesn't have a separate supply stream -- it takes oxygen from the flat.
An CO sensor seems obligatory to me: after the chemney sweeper (obligatory in Germany) measured 10,000ppm CO in the exhaust stream (defect, not normal operation), I didn't want to depend on a 25y+ boiler's electronics alone.
CO kills relatively fast. Even if rare, I don't want to die caused by a rare event that could have been avoided by spending ~50€ (here)