Discuss Viessmann Vitodens 100-w trouble maintaining central heating temp in the USA Plumbers Advice area at PlumbersForums.net
The manufacturer's instructions state to fit a LLH in certain conditions. We don't know that the OP's installation meets those conditions.It is just going in circles the flow is not enough the viessmann does not like a large difference in flow and return temp so will cycle the most obvious way is to follow manufacturers instructions and fit a low loss header.
Ric read what it says bud it states to fit one if it exceeds maximum flow or minimum flow or you don't know what you have it can't be any clearer. Merry Christmas kop
I see what you're saying, but we have inline flow gauges so we do know the flow (though you might have a point about the minimum flow). And since the system isn't working even if we reduce the number of circuits being fed, I think it's fair to say the issue at hand is more the insufficient working head than that the boiler maximum flow is being exceeded. But we can also check the required head and then we'll know if the boiler is doing its job.Ric read what it says bud it states to fit one if it exceeds maximum flow or minimum flow or you don't know what you have it can't be any clearer. Merry Christmas kop
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