We have recently purchesed a Vits spa from some one. When we did we replaced the heat element . It has worked well for the last 6 weeks but now it it tripping the breaker on the heater. Any suggestions.

Probably draws too much amperage on start up. Shut down the pumps and heater and try starting them 1 at a time, after the other is running. The other option is to replace the breaker and see if that does it.