🧰 What the part actually is

• A Honeywell Thera‑3 remote sensor with a 0.5 m capillary and M30 threaded sensing bulb.
• Designed to sense temperature where you mount it and connect to a compatible Honeywell thermostat/valve assembly.
• Typically liquid‑filled and used with older Honeywell mechanical control systems (e.g., radiator valves, TRVs or standalone temperature controls).

👉 This part number is essentially a sensor/remote capillary assembly, not tied to a specific boiler in the way internal boiler parts have dedicated model lists.

🧠 Which systems it can be used with

Because this is a temperature sensing element rather than a main device, it isn’t “matched” to boiler models — it works wherever a compatible Honeywell control accepts it (examples):

• Traditional Honeywell thermostatic radiator valves (TRVs)
• Remote sensing on Honeywell room or zone thermostats (older mechanical systems)
• Temperature detection in heating control panels or valves that accept capillary thermostats
• Some legacy HVAC equipment (boiler controls or actuators) that rely on external sensors

In other words:

✔️ Works with many Honeywell thermostatic devices that take a capillary sensor
✔️ Common in central heating temperature sensors, radiator valves, and older HVAC controls
❌ Not specific to a boiler model list like internal parts (valves/PCBs) would be

📌 Why there’s no boiler list

Unlike boiler parts that are engineered physically into specific models, this sensor is a general‑purpose remote sensing element. So instead of a list of “boiler models it fits”, the compatibility question is this:

✔️ Does your existing control device or valve assembly accept a remote sensor with an M30 thread and capillary lead?

If yes, then Y600150W55PKKL can be used with it.

🧠 Short summary

• Y600150W55PKKL = Honeywell remote temperature sensor (Thera‑3)
• It’s used with Honeywell mechanical thermostats, valve controls, or TRVs, not tied to specific boiler boilers
• Works wherever a compatible Honeywell control system needs a remote sensor