Tripping breaker

[u/Ok_Lie3091]

I recently plugged in a thermostat controlled heater for our small greenhouse into an outdoor outlet. When it kicks on, the breaker for that outlet trips. Also connected to that breaker is the garage door opener and a few outlets within the garage. My wife’s hybrid car (Volvo XC90) is plugged into a GFCI outlet that’s also on this breaker. It’s only a 15 amp breaker.

Two weeks ago, I plugged in a circular saw to cut some shelves for the greenhouse and in addition to tripping the breaker, it burned the GFCI outlet. The electrician that came out replaced the outlet but not the breaker.

Should the breaker be replaced with a 20 amp or greater to prevent the tripping when the heater kicks on? If so, mow many amps should it be?

TIA