What the manual says
Manufacturer manualThere is no demand for domestic hot water draw-off.
From this model's manual
Verified against the Vaillant Ecotec Plus installation & service manual.
DIY fix possible
Check your hot water taps to ensure they are fully closed and not drippingEnsure your heating programmer or room thermostat is set to 'On' if you require heatingCheck your smart home integration or external controls are requesting heat
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