I don't have a water softener or a filter system. But, personally, I would be uncomfortable connecting anything to my potable water system that is designed to operate at a maximum of only 80 to 90 psi of pressure. It seems to me that these systems should at least have a safety shutoff device on them to prevent a water leak.
A tank type water heater can withstand pressures of at least 150 psi or higher. It also has a pressure relief valve and an overflow pipe to carry water leakage to the exterior of the house. These are required by the plumbing code.
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