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  1. I have successfully used a KNX based...

    I have successfully used a KNX based decentralised system for my house, including heating, lighting, some security features and also greenhouse climate control. It works very well, the downside...
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    Thanks all. It turns out that the boiler pump...

    Thanks all. It turns out that the boiler pump needed to be set at a fixed high speed. With the automatic pump speed, the pump was going slowly which then made the boiler modulate its output and it...
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    Yes, I have D.078 set at 80 degrees. Regardless,...

    Yes, I have D.078 set at 80 degrees. Regardless, what happens when there is heating demand is that the boiler goes to about 65 degrees on the flow temp, and then goes into pump overrun mode. So...
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    Sorry, yes I did understand that using the NTC...

    Sorry, yes I did understand that using the NTC probe was one way to go. But I thought that the VR66 can alternatively take, as its input, the cylinder temperature dry contact that simply signals a...
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    My Vaillant is not a combination boiler. I am...

    My Vaillant is not a combination boiler.

    I am using the Vaillant system to produce hot water to circulate in a Megaflo tank. I would like to keep the Megaflo at 60 degrees, to prevent Legionella....
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    Just checking if anyone has found the answer to...

    Just checking if anyone has found the answer to this? I have a Vaillant VR66 unit that provides a DHW signal to a Vaillant boiler via the ebus. It seems that the VR66 does not set the DHW temp, and...
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