Question: Heating with large noise/ sound

Answer:

(1)heating sound is a normal pysical phenomenon, because bubble will be expansion when temperature increase, an old saying like"boiling water no sound, and sound water is under boiling" ,so don't worry, That is ok

(2)this is low pressure problem. If pressure of water supply is low less than 1.5 bar(5 floors' pressure ), the solubility of air is low, so bubble escapt to water when heating, that is making sound.

I suggest that you may close inlet valve and outlet valve, power  on water heater and keep it on heatng, 5 minutes sound will come down

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