These things basically something that helps with heating up the fluids in those things. You would have seen them in your piping system if you were brave enough to tackle that. They can be butt weld type, wafer pattern or even oversize flanged. Only if you know your way around this is when you actually know what the heck these are. But essentially, they are jacketed valves.
If you have been to the pipes and seen what these things could do and probably know what o do when something goes wrong, we would assume that you are either a plumber of some kind or someone who is just enthusiastic about valves and pipes.
Either way, make sure that everything is still working dandy before you go ahead and try to use it. Who knows what will happen if somehow it got damaged or something. Do you have any idea what the risk is for a broken pipe system?
Not only do you have to worry about the probably unfiltered water going to your sink, but the crap that you just flushed will probably just recycle itself. And not get flushed properly. And that is just a disgusting thing to think about. Imagine all the stuff that will happen to your dr5ain all because you did not think about the maintenance of your piping system.
You need to keep checking on the valve too because if not, then how are you going to make sure that everything is still up and running? That everything is still okay over there? you have to look and observe and reassure yourself that you do not have to spend an annoying amount of money for something like that.
And we all know that money is so precious and important that we practically cannot live and survive without it. The world revolves around it so we have no choice but to follow it, right? So you should check on your things there and see if there is something that needs fixing or else it is going to explode in your face.
Not literally of course but then again we know that some situations REQUIRE the real exploding part. You may have no choice but to try fixing the things that are broken, especially if they have a role of making life easier for you. Like the toilet or the sink. Maybe even the car.
Any of those get broken for some reason or the other then you get off your ass and fix them. Whether by yourself, if you have the means and the skills to, or by hiring someone else to do it for you. Still, that is going to require money and that always sucks balls. Any situation where you have to spend a ridiculous amount of money is always annoying.
We could be spending them on something entirely better than damage repair. But no, because life always finds a way of ruining things for us, we have to make due for emergency situations. Such as the pipes breaking and you guys running out of the water.