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A You can see here How Pool Heat Pump Work

A YES. The pool area is wet and electrical equipment is prone to leakage, and GFCI can quickly cut off the power to protect the safety of users. So it need to add a GFCI system.

A YES, it need to add a gfci breaker when you installing a pool heat pump.With wet pool areas and electrical equipment prone to leakage, GFCI can effectively reduce the risk of electric shock and ensure user safety.Many countries and regions (such as Canada, Australia, the European Union, etc.) also have similar safety regulations, requiring that swimming pool equipment must be equipped with GFCI or similar safety devices.

A YES. Pool heat pump not only can be installed outdoor, but also can be installed indoors, just need to make enough install space for air flow.