So I recently moved into a new property which is about 20 years old. Noticed that whenever there is water running, there is no noise but as soon as I close the tap, there is a small thud sound (like someone knocked on the wall) kind of sound coming from inside the wall (or at least that's what I think). The electric water heater is located just beside the wall on the outside of the house if that matters to solve the mystery of the 'thud'.
Same sound could be heard when I have the washing machine or dishwasher running but intermittently.
Any idea what may be causing that sound? And whether it is a serious issue to look at? What kind of cost am I looking at to solve it?
u/Many_Bowl_4410 — 17 days ago