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Old 02-02-2016, 04:01 PM   #16
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Thanks for the heads up, ghost..I have some cleanup to do in that area...a friend of mine said it would pass insp because the cold side isn't braced...when you say "eventually" do you mean ticking time bomb or 5 to 10 years?

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Old 04-04-2016, 01:29 PM   #17
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Re: Upgrading and replumbing with Pex


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Originally Posted by Yodaman View Post
I have installed several installations similar to your plan. Couple things I have learned that you may want to consider..
1.) put a by pass around the cold water manifold, it will help considerably with branch flow fluctuations when you have simultaneous users. (shower/toilet)
2. keep the the hot water manifold as close to the tank as possible. This will help get HW to the point of use quicker. The last few I have done I put the HW manifold directly above the tank.
]
@Yodaman ,

1) Any reason to not have a bypass on the hot side as well ?

2) I have a 2-family house, should I have one or two cold manifolds ? (2 hots since there are two hot water heaters) My thoughts are to have two in case I ever want to have a 2nd meter installed, would make it easier to retrofit.
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Old 04-04-2016, 07:10 PM   #18
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Re: Upgrading and replumbing with Pex


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@Yodaman ,

1) Any reason to not have a bypass on the hot side as well ?

2) I have a 2-family house, should I have one or two cold manifolds ? (2 hots since there are two hot water heaters) My thoughts are to have two in case I ever want to have a 2nd meter installed, would make it easier to retrofit.

1.) HW byass, it won't hurt anything, but probably not necessary. The main issue with the cold water is when one person is showering and someone else flushes a toilet. The cold water bypass helps prevent volume loss for the shower.
2.) Separate units should have their own meter unless you include water with the rent. I would set up a separate manifolds for each unit.
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Old 04-14-2016, 11:34 AM   #19
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Re: Upgrading and replumbing with Pex


Yodaman, unrelated, but the second pic you posted. Do you know what the pvc drain lines are attached to? Are those all toilets? And is it ok to use wye's like that? Just curious because I'm thinking about moving some of my drain lines around, some are toilets and the final product would look like that. Thanks.



It shouldn't use a sanitary tee or similar? I don't think sani tee's are supposed to be on their side, but it just looks like it would flow better.


Last edited by mikegp; 04-14-2016 at 11:42 AM.
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Old 04-14-2016, 11:48 AM   #20
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Re: Upgrading and replumbing with Pex


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Yodaman, unrelated, but the second pic you posted. Do you know what the pvc drain lines are attached to? Are those all toilets? And is it ok to use wye's like that? Just curious because I'm thinking about moving some of my drain lines around, some are toilets and the final product would look like that. Thanks.

Two toilet drops with a vent stack in the middle. There is another 3" vent just to the left out of the pic. As far as code compliance, all I can say is that the inspector didn't say anything and signed off.
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Old 04-15-2016, 07:23 AM   #21
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Re: Upgrading and replumbing with Pex


If you don't mind, I'd like to use your pic to make a thread asking others about it. Thanks.
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Old 04-15-2016, 08:01 AM   #22
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Sure, no problem
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Old 02-09-2017, 04:02 PM   #23
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Re: Upgrading and replumbing with Pex


Quote:
Originally Posted by Yodaman View Post
I have installed several installations similar to your plan. Couple things I have learned that you may want to consider..
1.) put a by pass around the cold water manifold, it will help considerably with branch flow fluctuations when you have simultaneous users. (shower/toilet)
2. keep the the hot water manifold as close to the tank as possible. This will help get HW to the point of use quicker. The last few I have done I put the HW manifold directly above the tank.



Attachment 204025

Attachment 204041
Yodaman-Your version is my inspiration, may i ask a few questions:
1. What is that on the tail of your Hot? and what is its purpose?
2. Regarding cold; the outer looks like its 3/4 with the trunk lines all 1/2" is this correct? or is are the cold trunks a mix of 1/2 and 3/4?
3. Regarding Hot; is that all the same size pex? If so what size is it?

I was planning a 3/4 trunk system for Kitchen and baths and direct lines for laundry and outside spigots the trunk would have half inch pex sections off the trunk going to existing 1/2 copper at fixtures.
Wondering if its ok to run Hot as all 1/2?...or should i use 3/4 trunks as well for Hot?

Also i have well water and will run 2 filters between the pressure tank and the manifold, filter 1 is a spin down and filter 2 is a whole house filter the spin down has 1" inputs which is the same as my input line from the pressure tank, but the whole house filter is 3/4 in and out.
My question here is since the whole house filter goes down to 3/4 that i can keep all pipes after that filter at 3/4...or would there be any benefit reason to up step it back up to 1" ? (as you know fitting prices drop a lot for smaller diameters
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Old 02-09-2017, 04:51 PM   #24
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Re: Upgrading and replumbing with Pex


[QUOTE=dimbulb;3953921]Yodaman-Your version is my inspiration, may i ask a few questions:
1. What is that on the tail of your Hot? and what is its purpose?

It's just a boiler drain valve in case I ever wanted to drain a HW branch line without draining the whole hot water system.

2. Regarding cold; the outer looks like its 3/4 with the trunk lines all 1/2" is this correct? or is are the cold trunks a mix of 1/2 and 3/4?
3. Regarding Hot; is that all the same size pex? If so what size is it?

All trunk lines are 3/4, all manifold branch lines are 1/2. The hot water feed is a cold 3/4


I was planning a 3/4 trunk system for Kitchen and baths and direct lines for laundry and outside spigots the trunk would have half inch pex sections off the trunk going to existing 1/2 copper at fixtures.
Wondering if its ok to run Hot as all 1/2?...or should i use 3/4 trunks as well for Hot?

You could put 3/4 inch trunk lines off your manifold and branch off from it. And you can do the same for the hot, but its not optimal. The 3/4 hot water lines hold a lot of water, cold water, unless it is circulating or recently been used. I like to keep 3/4 hot water lines as short as possible.
The cost of 1/2" pex is so minimal, just makes sense while doing it to home run each fixture.


Also i have well water and will run 2 filters between the pressure tank and the manifold, filter 1 is a spin down and filter 2 is a whole house filter the spin down has 1" inputs which is the same as my input line from the pressure tank, but the whole house filter is 3/4 in and out.
My question here is since the whole house filter goes down to 3/4 that i can keep all pipes after that filter at 3/4...or would there be any benefit reason to up step it back up to 1" ? (as you know fitting prices drop a lot for smaller diameters

ok to run 3/4, unless you are talking about some usually long distance
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Old 02-09-2017, 05:57 PM   #25
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Re: Upgrading and replumbing with Pex


Very nice, Thanks for responding so quickly! I will be able to put the hot manifold right next to the water heater as you do.
OK, not so much the cost of the pex but the cost of the valves/hardware...So just for Hot... so would 1/2 from the manifold to fixture and then one tee off to feed a 2nd fixture(in the "group area") be ok? or should line from manifold be 3/4 before splitting to 2 1/2 fixture feeds?...or is it worth it to run seperate 1/2 hots to each fixture? instead of grouping 2 fixtures to one feeder line?
(Again Hot side only...)
These are the groups areas all on one floor(manifold and water heater in basement):
bath 1 of 2 one sink and one tub 10-15 feet from manifold
bath 2 of 2 one sink and one tub 20 - 25 feet from manifold
Laundry has washing machine and sink - 10 feet from manifold
Kitchen has sink and dishwasher - 15 - 20 feet from manifold
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Old 02-09-2017, 06:44 PM   #26
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Re: Upgrading and replumbing with Pex


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Those flex tubes to the water heater will blow on you eventually. You should use a solid metal flex copper or stainless.

http://www.supplyhouse.com/Holdrite-...FQ6OaQod5jkHjQ

The ones you used have a plastic liner.
I agree with you on the flex lines. I tried telling people that on another post regarding water heater supply lines being braided flex and they were ripping me up and down saying there's nothing wrong with the braided flex lines. Even though I quoted several lawsuits regarding them bursting.

http://www.diychatroom.com/f7/water-...r-type-469033/
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Old 02-09-2017, 06:46 PM   #27
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Re: Upgrading and replumbing with Pex


Are any of the faucets for large tubs?

Generally speaking, if you want to feed more than one fixture, it should be fed from a 3/4 trunk line and then branch off to 1/2.

DW is a exception, ok to feed from sink faucet line.



As a alternative, to save $ you might consider a ready built pex manifold. Or consider forgoing the shutoffs at the manifold. They could be added in at a later date. Just put in a T and 1/2" branch line to each fixture. You still would have a main shut off in front of the manifold plus the supply stops at the fixtures.
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Old 02-09-2017, 06:49 PM   #28
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Re: Upgrading and replumbing with Pex


I also noticed you are using the plastic ice maker line. I've only been using copper lines since I had one break on me. I also had a guy come repair a part in my refrigerator under warranty and he said that he gets tons of calls where the plastic lines got brittle and broke and he had to write up a reason for the leak for the homeowner to claim it on insurance. Usually it's the wood floors that end up getting replaced.
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Old 02-09-2017, 07:10 PM   #29
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Re: Upgrading and replumbing with Pex


Quote:
Originally Posted by Yodaman View Post
Are any of the faucets for large tubs?

Generally speaking, if you want to feed more than one fixture, it should be fed from a 3/4 trunk line and then branch off to 1/2.

DW is a exception, ok to feed from sink faucet line.



As a alternative, to save $ you might consider a ready built pex manifold. Or consider forgoing the shutoffs at the manifold. They could be added in at a later date. Just put in a T and 1/2" branch line to each fixture. You still would have a main shut off in front of the manifold plus the supply stops at the fixtures.
No large tubs, 98% of usage is shower, is it feed rates? am i wrong in thinking if the two fixtures in each group would hardly be used at the same time then 1/2 trunk is ok?
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Old 02-09-2017, 09:56 PM   #30
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On the question of wyes vs santees my understanding is that the wyes are correct thing to have in there.
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