Your concept sounds great, but what is not discussed is the wire size that support the outlets. When a circuit is installed it is wired with the total wattage is will consume (wattage = Volts times amps). Therefore changing the breaker could put you in danger because the wires may not be "strong enough" to handle the additional power. When not strong enough they could get HOT and cause fires. Since the voltage never changes the breakers are listed by amps therefore wire size is also associated with the amperage it can handle.
Most electrical heaters are 1500 watts which is about 12.5 Amps (1500 watts / 120 volts = 12.5 amps) this is under perfect conditions. The 15 amp breaker gives you a little cushion.
You say you are not using the washer dryer outlets. I recommend plugging the electrical heater in one of those outlet. That is what we did.
Best of luck.
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