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Heating fill water according to VDI 2035 If you do not have normal tap water in your underfloor heating, or if your heating fill water is demineralized (according to VDI 2035), it is not advisable to use the fill water from a normal tap. Heating fill water according to VDI 2035 to protect against deposits in the pipes. In this video I will show you how I flush and bleed my underfloor heating. If the floor no longer gets properly warm and noises like cracking or clacking can be heard from the underfloor heating, it is time to flush the individual pipes until there is no more air in the heating circuit. I will show you how you can do this here, step by step. I only had one cap available to close the heating circuit. I closed the other circuits by turning down the thermostats in the rooms. This closes the actuators. I'm not a heating engineer either, so I did it myself, saving on the installer and also saving money. I know you can do it too, and I wish you all the best.