Hot tubs require GFCI protection for the circuit feeding the hot tub. They require cable or wire in a pipe going from the panel to the hot tub. Although not always required they sometimes require a disconnect for shutting down the power to the hot tub. These are known as Spa Buddys. The Spa Buddys serve a dual purpose as they also provide the circuits with GFCI protection.
Section 68 of the Canadian Electrical Code covers the code required to be followed for the installation of hot tubs.
68-068 of the CEC states that it should be no closer than 1.5 meters away if it is an integral part of an approved factory-built hot tub
Every hot tub requires a different amount of power and these requirements will determine the amps you need to supply them with. The manufacturer specifies the ampacity of the hot tub in the owner’s manual and on the nameplate data.