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Viessmann Vitodens 100 Connecting hot Water tank

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SUNEKTM

SUNEKTM

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1
Hi,
My dad and I have used all day to connect a external water tank to our Viessmann Vitodens 100 Boiler.

For some reason the 2 hoses we have connected to the boiler neither gets hot (i believe 1 should get hot) and we are at a loss.

Is there a configuration to do on the dash, or any things we need to adjust?
 
Is it a 4 pipe system? Eg 100 system boiler
 

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