this is the JK BMS you need B2A8S20P. Order from Hankzor on AliExpress
Yes, it handles from 4S thru 8S configurations.
IF you want the heating pad option be sure to order as such (-H suffix)
if you need additional current handling, use the heating pad port on the BMS to control a higher current handling relay. The cost is minimal and it gives you options even if you don't use it immediately.