Vallox 510 MV basement installations with external mushrooms side by side?

I assume. In the basement, stainless steel piping comes out of the house wall.

I’m afraid I can’t help you with the question. But can you provide some details about the stainless steel chimneys? Manufacturer/type, quality, price. We still need to choose one as well. Thank you very much!

Unfortunately, I cannot provide details about the mushrooms, as we had the system directly from the contractor in the offer and only know the final price for the entire system including installation. Basically, we are very satisfied with the ValloPlus 510 MV, it runs very smoothly and quietly. It might be somewhat oversized for us, probably the 350 would have been sufficient. But since we also ventilated the basement (which I can only recommend afterwards) fully, it should be fine. All components so far have also been exclusively (as far as I could see from the outside) from Vallox. It is also nice to control smartly with the MyValloxCloud.

Unfortunately, I can't provide details about the mushrooms, as we had the system directly from the contractor in the offer and only know the final price for the entire system including installation.

No problem, if you are satisfied, that's already good. I can well imagine the mushroom from the look. Then I can show the picture to the plumber :). Thanks!