Io House was the boarding school where Arnold Rimmer was educated.
Rimmer spent several years at Io House. His schoolmates included Fred Holden and Porky Roebuck. Rimmer was considered extremely wet and weird by his teachers, especially Bull Heinman, the gym teacher (Better Than Life). He took great delight in tormenting Rimmer, who captained the school skipping team (RD: Back in the Red II). Rimmer was made to take extra rugby practice to overcome his wetness (RD: Timeslides).
Rimmer was also unpopular with his schoolmates, who refused to call him by his self-appointed nickname, "Ace". They instead referred to him as "Bonehead" (RD: Kryten). Rimmer considered Io House to be an awful school, blaming it in part for his lack of success in later life (RD: Dimension Jump).
Rimmer also later attended university at Io Polytechnic, being forced to live under the torment of his social father, who was the school's sociology lecturer, who used Rimmer as a guinea pig is classroom experiments. ("The Beginning")
He later travelled back in time to his old school dormitory to make his younger self rich with the idea for the Tension Sheet, but gave Holden the idea instead (RD: Timeslides). When confronted with the reality of Ace Rimmer, Arnold assumed that "he got to go to some really great school, while I was lumbered with Io House.".