# How to find your Vaillant heat pump model number

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Updated: 2026-05-22
Language: en-GB

Where to find the model and serial number on a Vaillant heat pump, and how to read the VWL / VWF designation.

A Vaillant heat pump model number is printed on the data plate on the unit.

- On aroTHERM units the plate is usually on the outdoor unit casing.
- Model codes start with VWL (air-source) or VWF (ground-source).
- The serial number is unique to your individual unit.
- The model and serial number confirm whether your unit can cool.
- Have both ready before ordering a cooling resistor.

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