Vishnu at Sreevallabha Temple is being worshipped his cosmic, original and transcendental form Purusha which can be understood from (1) using different moola manthra/fundamental hymn for different aspects of Purusha contrary to the strict usage of only a single fundamental hymn in all temples, (2) sanctum-sanctorum is built in such a way that the top and bottom of the deity can't be seen as Viratpurusha has no origin and end, (3) Peetha pooja which is mandatory in all vaidika temples is not done here as Purusha is devoid of origin and end, (4) dressing up the deity only with white or saffron clothes contrary to popular yellow clothing used for Vishnu temples of vaidika sampradaya which suggests the eternity of Purusha and (5) the rituals and customs followed in the temple includes all Shaiva, Vaishnava and Shakteya worshipping that are now in practise in vaidika sampradaya because Purusha being the ultimate and others being only aspects of Purusha. Generally all kerala temples follow Vaidika School of worship based on the book Tantrasamuchayam. But Sreevallabha Temple doesn't follow Tantrasamuchayam and follows its own School called Pancharaathra Vidhaanam. No other temples are known to follow it but Thripunithura Sree Poornathrayeesa Temple follows a school of worship somewhat similar to that of Sreevallabha Temple. The temple has never changed its worship protocols since 59 BC and it is doubtful that any other temple follows such an ancient system.