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Just wondering if there are any issues with adding water to a UFH via the boiler filling loop… reason being wanting to flush out some gunk from a loop and ventilate but don’t have access at the moment to proper hose connection adapter so I can plug mains water at the manifold. Was thinking to...

I have a 2017 Viessmann Vitodens 100-W condensing gas boiler connected to a radiant floor heating manifold. No external pump. 120m2 floor area. Recently had the annual service. Boiler has been on for about a week now heating the underfloor heating cement slab. It is my impression that the...