Prior to turning professional in 2020, Heta won his first overall PDC title at the 2019 Brisbane Darts Masters as a regional qualifier.

He has since represented Australia in the PDC World Cup of Darts, winning the 2022 edition of the tournament alongside teammate Simon Whitlock.

Heta's win was considered a shock upset as he entered the tournament as a 250/1 betting outsider, having only won two televised matches before claiming his first title.

[8][9] After the victory, Heta discussed a potential move to the United Kingdom to play on the PDC Pro Tour, saying, "Hopefully I'll be able to come over to the UK soon and when I do people better watch out.

[13] Heta secured his PDC World Championship debut at the 2020 edition through finishing top of the 2019 DPA Pro Tour Order of Merit.

[17][18] Heta initially moved to England upon earning his Tour Card and competed in PDC events until he was advised to travel back home to Australia amidst the COVID-19 pandemic.

[22] Partnering Simon Whitlock, Heta made his PDC World Cup of Darts debut for Australia as a replacement for Kyle Anderson, with the pair reaching the quarter-finals.

[23] Heta was awarded a place at the Grand Slam of Darts as the highest-ranked player on the PDC Autumn Series Order of Merit who had not already qualified.

[26] He also had a significant run at the Players Championship Finals by reaching a second major quarter-final, where he led Mervyn King 7–2 before eventually losing 10–8.

[34] In June that year, Heta, in conjunction with Simon Whitlock, reached the final of the 2022 PDC World Cup of Darts after wins over Lithuania, Sweden, Belgium and England.

He defeated Michael van Gerwen in the semi-finals and Peter Wright in the final, with both matches going to a deciding leg where Heta won 7–6 and 8–7.

[42] In their defence of the World Cup of Darts, Heta and Australia teammate Simon Whitlock reached the quarter-finals but were beaten by Belgium (Dimitri Van den Bergh and Kim Huybrechts) in a deciding leg.

[47] He progressed to the knockout rounds by finishing second in Group H with 5–4 wins over Ricardo Pietreczko and Beau Greaves respectively and a 5–2 loss to Nathan Aspinall.

[52] The next month, in the lead-up to the World Matchplay, he claimed his second title of the year by beating Ryan Joyce 8–4 in the final of Players Championship 16.

[54] He was also runner-up at the New South Wales Darts Masters, but failed to capture a second World Series title as he lost 8–1 to Rob Cross.

[64] At the 2025 World Championship, Heta lost the opening set of his second-round match against practice partner Connor Scutt but won the next three for a 3–1 victory, including an errant dart at double 12 which saw him miss out on a nine-dart finish.

[66] Despite the defeat, Heta received a £60,000 bonus from tournament sponsor Paddy Power for hitting the nine-darter; he bought a Rolex watch upon the money entering his bank account.