We have a 2 month old house with a gas water heater that makes popping
noises each time the hot water is turned on.
I have seen where hard water is an issue. We do have a water softner
I have also seen where calcium buildup is a problem but this thing is
only 2 months old.
There is also a small hot water recirculating pump since the house is
pretty big but the noise seems to be coming out of the top of the hot
If you have high service pressure (water), or thermal expansion
is creating transient high pressure, the heated water on the
bottom of the tank will burst into bubbles of steam when the
pressure suddenly is lowered (by opening a tap). It will get
more pronounced as mineral buildup occurs later on.
To find out, you'd have to put a pressure gauge on the tank.
If this is what is happening, the best fix is installation of
a pressure reducing valve *and* an expansion tank.
I'll add that you should test the cold water for hardness, then the hot
and do this daily from one regeneration past the next by a day or so.
You may have hardness break through and it might be on a big laundry day
etc.. That will put hardwater into the water heater. Of course if the
hot water shows hardness you know you have a problem with the softener.
That could be a simple as setting the unit correctly for your water use,
or raising the salt dose, changing from potassium chloride to actual
salt, or increasing the dose etc.. Another cause would be flow rates too
high for the softener to successfully treat all the hardness during
heavy water use.
Quality Water Associates
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.