Is was installed for a small Bathroom near a swimming pool …
Maybe reconnect this one? I recommend connecting the second strap. But as far as a requirement, I do not know.
If you’re in CA, they have a specific list of strap requirements, look it up online for all the details.
The purpose of the straps is to prevent a ultra-heavy hot water tank from tipping over in a seismic event. Ask yourself, is this baby tank secure enough to stay affixed in an earthquake?