I have seen a few <4 of a similar item, don't know the brand name. They were installed with a direct 20 amp circuit w/GFI protection, based on the mfg instructions.
Installs were by the same EC; a single 20 amp recept, on a GF breaker.
The link to your unit does not appear to have any 'spec'; it mentions hot water, warm air, heated seat, etc. But no data.
Depending on the actual load, tie-in to the bath circuit may be an issue. I am not familiar with the CEC regs, so the ball is in your court.