cutting in new stops...

I'm remuddling a bathroom, and it's time to replace the stop valves under the lav, I thought I knew where the cut off valves were in the basement. Ha!

I went to where I thought they were, shut off the valves, and returned. Good thing I checked before I cut off the old sink stops.

It turns out there are no cut off valves for this sink, I'll have to cut in some new ball valves downstairs. That's not the problem.

I just want to know about turning off the water. If I shut down the house main input valve, that should stop the HOT water flow also, yes?
And should I shut off the heater? Or not needed?

Is that the rule? No cold in, not hot out? Or will I have to drain some off in the basement bar sink?

Thanks Guys and Gals

If you have an expansion tank, you might get some water out (maybe a gallon or so), but it will stop. Just open both hot and cold. Normally, unless there was some way to siphon out the WH, you wouldn't need to turn it off. Now, if it was in the attic rather than on the ground floor or the basement, it might not be a bad idea. What you never want is to empty the WH while it still has power applied, you can ruin it.

valves

One question. If there are stop valves under the sink, why would there also be stop valves in the basement? It is seldom if ever done that way.

Well...

hj said:

One question. If there are stop valves under the sink, why would there also be stop valves in the basement? It is seldom if ever done that way.

Click to expand...

The one's under the sink are to fix the faucet, the ones in the basement for more involved modifications above the basement. Like when you need to replace the one's under the sink.

However, if I'm going to turn off the water, I might as well just swap the valves under the sink and forget about the one's I was going to add in the basement.

What do you think, is less more?