The tempering valve is installed at the outlet of the hot water storage tank, and its output is then piped out to the hot water distribution of the facility.

Where is the tempering valve located?

A tempering valve is located externally on the hot water system. It is installed between the cold line and hot water line.

What happens when tempering valve fails?

And if the tempering valve is not adjusted correctly, it will not be able to cool down the hot water enough to make it safe. ... A failing valve may also result in water that's too cold. Due to this, your water might not run at the right temperature at all consistently and may fluctuate between being too hot and too cold.