This part is the standard inlet elbow for several Bloomfield units

Precise Two-Stage Logic: Calibrated

4 inches water column is a critical threshold

and the essential P100100 observation door gasket to ensure a gas-tight seal during operation

and the necessary technical conversion labels required for a code-compliant installation by a licensed HVAC technician

Hydrolevel 1100H5 Low Water Cut-Off 321042-401 This part is the standardThe Hydrolevel 1100H5 is a 24VAC low water cut off (LWCO) engineered specifically for high efficiency residential boilers. This compact probe type control utilizes Hydrolevel CycleGard technology to periodically shut down the burner, allowing the water level to stabilize for accurate sensing without nuisance tripping. It features an automatic reset function and an integrated burner circuit test button for rapid diagnostic verification during