Any reason to have hot/cold pies run into one?

[NickG]

While installing the water heater, I realized that the hot and cold lines eventually meet and go to a single line that is no longer used, so it is shut off by a valve on that run of piping.

But why would anyone ever run the hot and cold together???

 

[Jadnashua]

It might be a tempering valve...this is a mixing valve that prevents the outlet water from getting beyond a set temperature as a safety factor. Got a picture?

 

[Sponsor]

 

[Cass]

Are you saying that the 2 pipes meet, go to 1 pipe, then a valve?

or

2 pipes go to a valve, then turn into 1 pipe then stop.

 

[hj]

pipe

The way you describe it, there is no good reason for doing it. But if it is arranged a bit differently, then it could be a recirculating line, but if so there is more to the pipe, as far as valves are concerned, than you describe it.