Dega Research Spa Bath Heater - OBSOLETE. Replace heater with a Heated Pump such as listed here.
Cat no 1-0520-00 & others
Spa Bath Heater. We recommend upgrading the pump to a heated pump, or disconnecting these electric heaters.
There are currently no Approved or Legal Standalone Spa Bath Heaters in Australia. The cheap, Chinese ones found elsewhere are dangerous, and have been reported to Energysafe multiple times, who have advised they are trying to stop, but it's hard to control the import of them.
Dodgy, cheap electric heaters can be FATAL.