NaHS03 heated and want products

I have 2NAHS03---Heat___2S02+Na +2h20

aLSO Fe in CuS04---

Fe(N03)3 + 3NH4OH --Fe(OH)3 +3NH4N03

I don't know what NaHSO3 produces on heating except I'm sure SO2 is one of the products. I'm also sure that Na is not one of the products. My best guess is

2NaHSO3 ==> Na2O + H2O + 2SO2.

Fe + CuSO4 ==> FeSO4 + Cu

Fe(NO3)3 + 3NH4OH ==> Fe(OH)3 + 3NH4NO3
One note here. NH4OH has been shown not to exist; actually an aqueous solution of NH3 produces NH4^+ and OH^- but no NH4OH is present.