Heater off - 105.1 dB(A)
Heater on - 106.1 dB(A)
Is this with the vents open or closed? Side popout vents open or closed? ISTM that the noise is a lot higher with the side vents open, especially if the open side is forward, & the airspeed also makes a difference.
I don't think you can make one number cover all the possibilities.