Tuhia he haere tonu mo tenei waahanga - I a ia e tamariki ana, i whakataetae a Ehrhoff mo te roopu o raro iho i te 18 tau o Tiamana i te tau tuatahi o te 1999 IIHF World U18 Championships, i whakahaerehia i Füssen me Kaufbeuren, Tiamana. I hoki mai ia i te tau e whai ake nei mo te 2000 IIHF World U18 Championships i Switzerland, i mutu ai a Tiamana i te tuawhitu. Katahi ka tiimata a Ehrhoff i te taumata o raro i te 20 i te Wahanga I o te 2001 World Junior Championships. Ko te manaaki i te whakataetae i nga taone nui o Füssen me Landsberg, i ngaro a Tiamana i te whakatairanga ki te whakataetae nui i te tau e whai ake nei ma te whakaoti i te tuarua i muri o France. I puta a Ehrhoff i tana putanga tuarua i te taumata Wahanga I mo te 2002 World Junior Championships
i Austria, e ārahi ana i ngā kaituku katoa o te whakataetae me ngā whāinga e toru me ngā tohu e 10 i roto i ngā kēmu e rima. I awhina ia i a Tiamana ki te whakatairanga i te whakataetae nui mo te tau e whai ake nei, i te wikitoria i a Austria 7<unk>1 i te kemu mētara koura. I roto i nga tau e rua e whakataetae ana i te whakataetae, i whiwhi a Ehrhoff i nga honore o te Kaitiaki Tino.