ASA Failover separate

[Jay Cambell]

I have 2 ASAs with LAN failover. Is it possible to configure failover with 2 internet circuits connected to the wan ports? I mean with 2 separate public IP addresses.If so can you send documentation how to configure it? 

[Marvin Rhoads]

You can run an ASA with a primary and backup WAN. That applies whether it is a single appliance or an HA pair.

https://www.cisco.com/c/en/us/support/docs/security/asa-5500-x-series-next-generation-firewalls/118962-configure-asa-00.html

You cannot easily run two ISPs simultaneously active unless your use case is amenable to policy-based routing.