Shutting off hot water?

1348 Views 5 Replies 3 Participants Last post by Scuba_Dave, Jul 16, 2009

RyanD

Discussion Starter · Jul 16, 2009

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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Scuba_Dave

· #2 · Jul 16, 2009

The main valve coming into the house should shut off all water
In some cases they are so old they need to be replaced as theyw ill not shut off the water

Sounds like your boiler also provides hot water
So shutting off any input to the boiler will shut off hot water
My boiler has a separate shut off valve, I do not need to shut off all water to the house

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Scuba_Dave

· #6 · Jul 16, 2009

RyanD said:
So even if there is water in the tank it wont flow of the main valve is off?

Correct - water is fed thru the pipes by pressure
Most house have between 35-80 psi
Once the water is shut off the pressure will drop - after a vlave is opened to remove remaining pressure in the lines

The exclusion to this is if you have a supply that is LOWER then the boiler
I have never seen this - except for the valves that are used to drain the boiler
If you do drain the boiler make sure the power is off 1st
You don't want it to kick on & try heating air

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