215 Remarkably quiet With a sound power of 51dB(A) indoor, and 44dB(A) outdoor, it is one of the most silent domestic hot water heat pump. 44 dBA Daikin Altherma M HW Outdoor sound power 51 dBA Daikin Altherma M HW Indoor sound power Sound pressure scale The acoustic level can be evaluated in two ways J The sound power is generated by the unit itself, independently of distance and environment J The sound pressure is the sound perceived at a certain distance. The sound pressure is usually calculated at between 1 and 5 metres from the unit. Sound power* Sound pressure 20 dBA falling leaves 30 dBA whisper 36 dBA library 50 dBA rain 60 dBA talking 100 dBA trumpet 140 dBA fireworks
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