Grundfos 59896775 UP15-29SU Circulator Pump 115V 9H 60Hz

Can i connect it in 1/2 pipe

What's the difference between this model and the one ending in 776?

Does this unit operate on electricity or a battery (old unit plugs into the wall socket)?

My old pump has a thermostat wired into the pump to turn it on and off. Everything else seems to be an exact match. Will this pump be a replacement?