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Old 11-19-2013, 09:06 AM   #1
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Y U install unions/shut off on a HWH


so when it takes a dump years later ..you don't have to torch hot /cold? fittings out .. fittings in...2 beer job on a Saturday afternoon flushed this guy since 1989 every fall

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Old 11-19-2013, 09:14 AM   #2
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Y U install unions/shut off on a HWH


There should never be a shut off on the hot side.
Good luck trying to get a gate vale to stay closed and not leak by while your working on it.

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Old 11-19-2013, 09:16 AM   #3
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There should never be a shut off on the hot side.
Why not?
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Old 11-19-2013, 09:30 AM   #4
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Y U install unions/shut off on a HWH


Valve reqd on cold-water supply at or near WH____[2903.9.2] {605.2}n Valve must be full-bore type F41,42_______________[2903.9.2] {605.2
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Old 11-19-2013, 09:38 AM   #5
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Y U install unions/shut off on a HWH


Biggles- seen a lot of Kenmores last a long time- especially when you flush and maintain them like that. I like the record keeping system

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Valve reqd on cold-water supply at or near WH____[2903.9.2] {605.2}n Valve must be full-bore type F41,42_______________[2903.9.2] {605.2
I know they're required on the supply side. All equipment and fixtures require approved unions and valves.
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Old 11-19-2013, 10:06 AM   #6
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Y U install unions/shut off on a HWH


I guess the logic is some one shuts off the hot side, thermostat fails and pressure continues to build.
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Old 11-19-2013, 11:14 AM   #7
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Y U install unions/shut off on a HWH


But even w/o valves pressure would build anyway--until it fully compressed the bladder in any expansion tank-- before the P&T finally lifts. I have valves on both sides of mine. Makes replacement truly a 2 beer job since don't have to drain hot and/or cold water lines for 3 floors.. and then have to vent and refill them all..
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Old 11-19-2013, 11:25 AM   #8
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Y U install unions/shut off on a HWH


Nice set-up biggles. Quick and easy to swap out. Next time you have to replace it, in the interest of future proofing, I would replace those gate valves with ball valves. Just a thought.

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Old 11-19-2013, 05:01 PM   #9
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Y U install unions/shut off on a HWH


I drain it into a 5 gallon bucket to see what drops down as it drains to see what it gives up every year.some rust that looks like sand once in a while.the trick with the unions.... if the pipes come in on the horizontal they are liberal to the new HWH refit.if they drop down in a fixed mounted vertical drop you have to be more careful,and pop that relief randomly thru the year

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Old 11-19-2013, 08:47 PM   #10
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Y U install unions/shut off on a HWH


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Why not?
Its ilegal around here to install shut off on hot water side of heater around here.
I saw the results of a capped off pop off valve on a house south of here years ago,pushed a really big piano into the head board of a bed when nobody was home(lucky for them).
Its considered bottling ,if the pop off doesnt give and that valve gets shut by a home owner for some reason it can be really ugly.
We also demonstrated it on a water heater in the middle of a field back when I still taught.
Plugged the pop off then filled heater with water and put pipe plugs into top of heater to bottle it.
Put a coleman stove under it and let it cook for around 30 mins while we watched from a telescope,cleared the top of the tree line and hung a left turn across the field.
The class was impressed!
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Old 11-19-2013, 09:11 PM   #11
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Y U install unions/shut off on a HWH


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Its ilegal around here to install shut off on hot water side of heater around here.
I saw the results of a capped off pop off valve on a house south of here years ago,pushed a really big piano into the head board of a bed when nobody was home(lucky for them).
Its considered bottling ,if the pop off doesnt give and that valve gets shut by a home owner for some reason it can be really ugly.
We also demonstrated it on a water heater in the middle of a field back when I still taught.
Plugged the pop off then filled heater with water and put pipe plugs into top of heater to bottle it.
Put a coleman stove under it and let it cook for around 30 mins while we watched from a telescope,cleared the top of the tree line and hung a left turn across the field.
The class was impressed!
YouTube has several exploding WH videos They're entertaining to watch for sure.

I was just messing with Joe earlier. I can't recall putting two valves on a residential heater but have done so many times on commercial applications- never been called on it when inspected by the plumbing inspectors, engineers or even the corp of engineers at military sites.

I totally understand the reasoning behind bottling and as the code says- AHJ has the final say.
I can pipe my T&P's outside- which I understand is not allowed in other areas. But we cannot pipe it to the pan.....
The minor list of code differences goes on and on.......
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Old 11-19-2013, 09:51 PM   #12
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Y U install unions/shut off on a HWH


opinions on hard piping the HWH off the supply,HD sells the flex lines as HWH lines then my gas company National Grid condems them
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Old 11-19-2013, 10:14 PM   #13
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Y U install unions/shut off on a HWH


I always kind of grouped the flex copper water heater lines in with trac pipe,green field/flex......
Of course i still remember some of the older guys I worked with as a kid complaining about that damn new fangled thin walled e.m.t conduit,saying it would never be as good as rigid pipe!

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