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No, even if the ground net is broken, the building is still a Faraday cage, and there will be no discharge in the cage, not to mention that there is a natural foundation for grounding.
It's very simple, and I've done it myself a lot. Here's how: >>>More
I think the landlord and the property have a certain responsibility, because you found the problem in advance, but they didn't solve it in time to cause this result. >>>More
If you can confirm that the water is leaking from a place other than the bathroom, there is no responsibility of the homeowner, because the room outside the kitchen and bathroom can not be waterproofed, all of which are your responsibility.
Find a professional underfloor heating, let him connect it for you, and use the card hoop link, there should be no problem! Rest assured to use, you can get it for a few dozen dollars!
It belongs to the normal damage of the construction, and it is no problem to connect it and suppress it without leakage.