Heating control valve, are there any improved versions?

My signature follows me. As if my grove didn’t have enough problems already, he is trying to live out every Macke described here in the forum. Yesterday I went home with WoWa, and it took me 10 hours for 350km. Thanks to warm weather and permanent stamina we didn’t get quite off the hook, to my delight the message ‘coolant level’ appeared. So drove to the right, found that about 1l was missing, this carefully with drinking water from the m WoWa replenished and hoped. Soon afterwards the same thing again: No water under the car to see, but containers completely empty. After the opening of the container came again water and then disappeared again. So let the engine cool down a little and again 2l after tilted. We could use the break for the dinner, so that the return trip then worked without any problems (was already cooler). I had thought that the engine had too high pressure through the wowa operation and the whole water was blown off h but that was not the case, only today I found that the car drips when the heating is off. As a well-read forum pro I immediately tapped on the heating control valve and drove on with heating. This is really fun in the weather, I still glow the cheeks now. Now my question: Is there an improved version of the control valve that doesn’t give up the mind so early? Would you remove the valve from a butcher (see Sig) or better buy a new one? In the colorful bay I found the fast none. I had actually hoped that my car would last 50-100Tkm, but at the moment I doubt it…