# Which Vaillant heat pumps need a cooling resistor?

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

The Vaillant aroTHERM Plus, aroTHERM Split, legacy aroTHERM and flexoTHERM / flexoCOMPACT models that use a cooling resistor for active cooling.

The Vaillant cooling resistor (0020266328 / 0020269259) applies to cooling-capable
Vaillant heat pumps in the aroTHERM and VWL / VWF families.

- aroTHERM Plus: monobloc air-source, VWL ../6 series.
- aroTHERM Split: VWL ../5 AS S2 series; cooling activated later.
- Legacy aroTHERM: VWL ../5 AS series; verify model and serial number.
- flexoTHERM / flexoCOMPACT: VWF series; cooling depends on heat source.
- Always confirm the exact model with a Vaillant-approved installer.
- Price: GBP 47.50. Condition: new, genuine OEM, factory packaging.

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