At the beginning, I advise you to carefully consider entering this type of company for two houses. I don't know this specific situation, but... I know life! And I know many such conflicts that broke out over trivial things and effectively poisoned life for many years.
If there is really no other option, you can drill a common well. But a common pump and hydrophore is not a good idea. How will you divide the costs of energy and necessary service? Who will supervise the system and who will be responsible? So I propose to share the costs for the well and then introduce two separate submersible pumps into it. In addition, each house should have its own hydrophore and individual installation. The advantage of this solution is also greater independence and safety in the event of a failure - with good systems, you can use a second system by borrowing water from a neighbor until the problem is fixed.
And if it is necessary to have a common pump, one collective hydrophore can be placed underground (properly insulated, of course). This way, there is no dilemma about who should keep it and whose tank will take up valuable space. To sum up, with such a system it is possible to install a submersible pump, an expansion tank and a pressure switch ("press control") "in the well". At the exit, you only need to install a splitter for both buildings. This will work, but... I suggest still remembering the rule to install as few common parts as possible.
To minimize possible disputes, the system can be expanded a bit more. The cost will not increase significantly. So, a common well with a common pump installed, from which two pipes with non-return valves need to be led out. Their main function will be to direct water only towards the hydrophores, but block the return towards the well. The pumps can also be powered from both houses - this can be done by two additional contactors that turn on the pump. However, these must be contactors with mutual locking of switching on, so that when an attempt is made to switch them on from both houses, only the power supply of the recipient whose pressure sensor in the hydrophore sent the signal first is switched on. In this system, each house is billed independently (more fairly) and in practice pays for the energy it used to pump its own hydrophore. In case of
In case of mutual pumping of water, the costs will be divided more or less equally. You can also add solenoid valves to the system that open the water flow only when water is pumped. However, I think this is an unnecessary increase in the complexity of the system.
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