2000w GoPower! inverter to power heater? ['24 T@g 5w BC]

b407driver

Bought lightly-used recently, and original owner had had this inverter installed: GoPower! Industrial Pure Sine Wave GP-ISW2000-12), along with an additional 100wH Battleborn lithium battery. It was wired to power the microwave (since un-installed by me) and the air conditioner, but what would be most useful for me is to power the heater and the hot water.  I understand this inverter is specifically designed for high-load applications (thus relatively inefficient for charging your phone, for example), so I'd think may be the correct piece of hardware for a heater.

Has anyone successfully powered the heater via an inverter?

Thanks for any info!