I mean it's an "airless" closed loop with 95% clean h2o. The water may gets darker after time from bacteria dieing but there will probably never grow anything concerning 

I mean I work since 10 year in this job and I never heard of any spontaneous leaking and well we never thrown a system out because of that

Here in Germany we never really got earthquake and even the hardest we got in the last hundred years just rattled some roof tiles off. Also it's very common in Europe to use floor heating (due to the lower temperatures you need to provide and such beeing more efficient with heat pump)in neuer buildings so mostly everyone does it

Just desalted water from our osmosis machine 

its 20mm /3mm PEX pipe

They are 17 individual loops it usually takes up to a day till the floor has its initial temperature after that temperature changes take not longer than 30mins

It's an open container and a submittable pump (usually used for lifting ground water from 100m) that pumps it from the bottrem of the container into the loop and when it comes back from the loop it gets dumped on top of the water line, since the pump transport around 3500l/h we let a single loop with roughly 5-15l circulate for roughly 15mins before we switch to the next (English is my second language so please ignore the grammar mistakes)

The hallway itself doesn't has a loop on it's own so we heat it with the entrance pipes of the different rooms

I'm the installer lmao. We got a system with an high power pump cycles every loop multiple times and dumps it in an open container before we connect the heat pump 

The red lines are the spaces where the people that build the walls might drill, it's that dense because behinde me in that picture there are 3 rooms with together 6 loops and in the middle left  behind the wall is the manifold 

Cars take a lot after phones, like one big screen and no way to repair it. Maybe when a car needs to be replaced when their tank is empty, people gone think about what they buy

That shelf looked so empty to I shoved Dori in for the photo