As far as I would imagine - it should support it, as longs as it's LWAPP and not autonomous. The only difference I can see on the 1252 is the N radio. However you could ask your cisco reseller to confirm?
Here is a note to add to the great help from Scott and Andrew. These are the latest H-REAP requirements;
H-REAP is only supported on the 1130AG, 1240AG and **1250 access points and on the Cisco 2000, 2100 and 4400 Series Unified Controllers, the Catalyst 3750G Integrated Wireless LAN Controller Switch, the Cisco WiSM, and the **Controller Network Module for Integrated Services Routers.