Resideo - Honeywell Home L4008E1040 High Limit AquastatThe Remote Bulb High Limit Aquastat by Honeywell Home (model L4008E1040) delivers reliable boiler safety and precise temperature control. With a manual reset and a temperature range from 110 to 270F, this device protects your boiler from overheating while keeping system performance consistent. The 5 1 2" cap provides a robust sensing element for dependable operation. Manual reset safety: ensures a deliberate restart after an overheat condition.

and daily use

Designed for 1/4 inch stem flare valves and compatible with cage trim

fan status

heat-conductive compound

it helps quickly restore hot water availability for busy households

Its 25# RTG rating and integrated flow interlock add extra protection

it delivers dependable automatic shut-off when needed

this valve offers dependable performance in a wide range of applications

reliable construction built to withstand demanding HVAC use

HD52AZ001 preserves mounting and electrical footprint for straightforward installation

Manual reset ensures safe recovery after trip

OEM relevance: direct replacement for original impeller