To reheat a spiral-cut baked ham, wrap the ham in tinfoil, and bake at between 275 and 325 degrees Fahrenheit for 10 minutes per pound of ham. Another option is to reheat a ham in a slow cooker.
When reheating a ham in the oven, place the ham cut-side-down on a baking sheet or roasting pan lined with tinfoil. To reheat a ham in a slow cooker, place the ham in the slow cooker with 1 cup of water, cola or chicken broth. Cook the ham for five to eight hours until thoroughly heated. To glaze the heated ham, coat the ham with glaze, and broil uncovered for 10 to 15 minutes.