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Shutting off hot water?

1347 Views 5 Replies 3 Participants Last post by  Scuba_Dave
If I shut off the main water valve will that shut off the hot water too? The reason I'm asking is I was looking over the boiler system last night and I noticed that the water comes in from the cold water pipe into the tank. Pipes then come from the boiler(to heat it up I guess) and then a pipe comes out with the hot water into the house system. The off things [to me] was there was no shut off valve so it got me think if it can be shut off. Does the hot water pressure come from the same source as the cold?
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If you have a boiler to heat your domestic water, shutting off the main water supply (cold) will also shut off the supply to the boiler, essentially shutting off the hot water too. You said it has a tank. It is possible to have a domestic water storage tank, but it more likely that the tank is the expansion tank for the heating water loop. That tank will still have boiler pressure even with the supply turned off. That is normally a small tank strapped above the boiler with a drain cock and a single pipe going into the bottom of it. Don't open that drain while the water supply is shut off. The water that circulates to provide space heating is separate from your domestic hot water.
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