I'm turning off supply in a house that is new to me. I think that I'm
able to shut off the supply as it comes into the house. I opened some
faucets and let it drain and flushed a toilet, but it never came to null
in terms of flux.
These faucets sit gravitionally-equal to the center of the hot water
heater, so I figure I have to turn off the supply to the hot water
heater as well in order to stop that from wanting to leave the heater.
Have I diagnosed my problem correctly, and can I leave the pilot light
on for all this safely? I could have the supply off for as much as a day.
On Sunday, November 8, 2015 at 4:51:45 PM UTC-5, Cal Dershowitz wrote:
Have you opened the highest and lowest faucets as well as faucets In between? With
the top most and lowest faucets open, all water should drain from the system.
If the flow doesn't eventually stop, I would check the meter. If it is registering flow with the
faucets open and the main shutoff closed, then the main isn't really closed. It could be bad.
If that's the case, you'll need to call your local water authority and have them shut the water
off at the street so you can fix your shutoff.
One more tip related to shutoffs: whenever you open a shutoff, you should open it all the
way and then close it about 1/8 of a turn. If you leave it open all the way, you have no
"play" should it get stuck due to corrosion, etc. If it's left fully open, you might not be able to
close it, which could be an issue in an emergency.
First, it is entirely possible that the "shutoff" doesn't shut, completely.
Many of these (esp older) were gate valves which are notorious for not
shutting off after years of unuse (it's literally a "gate" that slides
down to block the water path through the valve -- calcifications, etc.
end up preventing it from seating completely after longs periods of unuse)
Second, your hot water supply is probably back feeding into the cold
water supply (in the absence of any positive pressure) so there will be some
flow until it, too, is depleted (assuming the shutoff *does* function
Look for outdoor hose bibbs as well.
Turn off the water heater if you expect it to drain. You don't want to be
heating an empty vessel!
Resist the temptation to drain the water heater from the "boiler drain"
that is present in the side of the water heater. Again, these things are so
rarely used that you might find *opening* it leaves you with a valve that
you can never *close* properly, afterwards! (why make extra work for
What's the reason you are turning the water supply off?
Here, you just install a heat trap (primarily for your own efficiency).
Pressure reducing valve (drops the 100+ PSI municipal supply down to
something more manageable for appliances -- which, I think, expect ~80PSI
max) effectively prevents water from reentering the municipal supply.
Here, we worry more about irrigation water being siphoned back into the
municipal supply (e.g., if a fire engine pulls a vacuum on a local
hydrant or supply pressure fails for other reasons). People like
to use *lots* of herbicides and insecticides in their "lawns", here.
On 11/8/2015 9:22 PM, firstname.lastname@example.org wrote:
"Requirements" seem to have little to do with what is *actually*
E.g., irrigation supply is supposed to have an anti-siphon device
installed 12" (or more) above the highest point in the system.
I can walk around the neighborhood and count the number of
homes that have these installed -- on a single *hand*!
Few homes have pressure regulators (not a requirement, just
something you do if you value your plumbing and appliances!)
and most folks aren't aware that the city has been increasing
supply pressure to accommodate increased demand without
increasing the sizes of the lines that supply the water
to homes. And, few folks have considered the extra head
required to lift the water the 30-40 ft from the local well
up to the level of the street that "feeds" our subdivision.
Homes *with* pressure regulators seldom have expansion tanks
installed. As a result, the pressure regulator does little
to "protect" the plumbing when there is a fair bit of hot water
Rainwater collection tanks are supposed to be located 10 ft
from property lines. Yet, most are located in side yards
and easily violate that constraint.
With the exception of expansion tanks, virtually all of this
stuff is visible to anyone driving down the street...
If you open the faucets above and below the water heater air will
enter the pipes and break the siphon that would be necessary to drain
You should still run the hot water until all the air is out (after
restoring water pressure) before you turn the heat on, just to be sure
it is full.
On 11/8/2015 7:31 PM, email@example.com wrote:
Thx all for comments. I know it sounds banal as heck, and youtubing was
a good resource, but I always find that I believe what I'm doing is
correct when I hear it in a peer-moderated forum.
I turned off the main (water) supply, then closed the supply to the
water heater...faucets open above and below...sawzall out shower
faucet...make new stubs with galvanized half inch pipe with caps, ready
for transition to copper.
Is there anything about the transition from a male galvanized nipple to
a female copper adapter that is trickier than use thread seal and
I never drained it, never turned it off, but I appreciate the tip to
bleed out any air.
It made me go do it, and I heard a bump indicating something was still
not completely water.
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