I would agree with John:
Best suggestion I can make is- call the heat pump maker and ask!
It kind of makes me wonder about the legality, or indeed the safety factor of running a piece of equipment like this, where a winding may short to ground.
This is amplified by the fact that people will be immersed in the water supplied by a unit like this.
One other recommendation I would make is ask your Inspector or AHJ about this one.
If there are GFCI's now that can overcome these Compressor leaksge currents, that would be a great leap forward.
Nuisance tripping is usually the first reason why most safety systems are either bypassed or removed completely.