Vaillant VR71 demand input voltage

0ldskoolskater · 17 Apr 2023

Calling all VR71 owners!

What voltage is present at the external demand input S6/S7/S8 terminals on the VR71?
I'd like to add a 3rd party UFH system which uses these terminals to call for heat, so want to make sure that by connecting a UFH wiring centre which has a volt-free output, that this will trigger the call for heat at the boiler.

Thanks in advance for your informed replies

Steve

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Vaillant VR71 demand input voltage

0ldskoolskater

DIYnot Local

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