Pex Plumbing System w/ Manifold (Entire House)


Pex is typically installed as home run, not trunk and branch. The central manifold gives (mostly) equal pressure to all fixtures, so temperature won't change when water pressure changes like on trunk and branch. Because water pressure variation won't scald or freeze you, home run also allows more latitude with pipe sizing.

Home run pex also gives you the other advantage of pex, freeze protection. No fittings in walls, attics, or crawlspaces means no hidden damage if a freeze occurs, that's probably worth the added $100 in pex tubing.

1/2" pex will have no problem delivering enough water to any standard fixture. Test have shown that pex will perform almost identical to copper in standard household systems at 60' or more:

You may be able to outrun your 3/4" feed though. If you have 20+ outlets you probably have laundry, showers, and hose bibbs all sharing that 3/4" feed. Turn on a garden...

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I know there are certain TV personalities (at least up here) that have endorsed and championed manifold - or home run systems but, I don't much care for them.

While there are certain potential advantages of control within the mechanical area, I feel they are a waste of material for one and secondly, it can take far too long for hot water to reach a given fixture - especially in a sprawling house.

I feel a better way to go is to plumb a single oversized (3/4 or larger), line with the required 1/2 or 3/4 take offs (kept short) around the entire house with a return line take off near the last fixture. This keeps the water moving in the lines, provides almost instant hot water to any give fixture and minimizes materials while supplying great volume. A simple Grundfos comfort pump on the return and you're good to go.

My .02...

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Mount the PEX manifold to the building at the end of the appropriate water-supply PEX pipe, using wood screws to hold the manifold in place. The manifold's intake port must face the water supply pipe. If the manifold controls the hot water supply, mount the manifold at the end of the water heater's discharge pipe. Run the wood screws through the manifold's mounting holes, using a Phillips screwdriver to turn the screws.

Slide a PEX crimp ring over the water-supply pipe. Position the crimp ring about 1/4-inch from the end of the pipe. Usually, a water-supply pipe uses 3/4-inch PEX pipe and a 3/4-inch crimp ring.

Push the water-supply pipe over the PEX manifold's intake port. Center the crimp ring between the two barbs on the manifold's intake port. Place the correct size PEX crimp tool on the crimp ring, holding the tool at a 90-degree angle to the manifold. Squeeze the crimp tool's handles until the jaws touch.

Slide the correctly sized PEX crimp ring...

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For decades, copper pipe was the best option for water supply lines -- it didn’t contaminate the water as older lead pipes did, and it resisted corrosion. While copper is still useful for plumbing, cross-linked polyethylene, or PEX, is quickly becoming the water supply pipe of choice for residential systems because it’s affordable, flexible and do-it-yourself-friendly. When combined with a manifold system, PEX eliminates splicing and reduces the risk of leaks. PEX comes in various sizes to accommodate water pressure and your individual household fixtures.

PEX Diameter

When you're buying PEX, the important number is the “nominal” size. This construction standard indicates the pipe is compatible with fittings of the same size. The flexible tubing comes in rolls of 50 feet up to 1,000 feet. PEX tubes range in diameter from 3/8-inch to 1-inch for residential applications. For adequate water flow, it's a good idea to install 1/2-inch or 3/4-inch PEX for your main lines....

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This category features manifolds for plumbing and radiant floor heating applications in copper, stainless steel and brass material types. Typical PEX manifold design consists of a trunk (main pipe) and outlets (branches) with connections adapted for connection of PEX tubing. When water enters the manifold, it’s distributed through the branches and travels to designated locations.

Radiant Heat Manifolds

Stainless steel or brass all-in-one pre-assembled manifold sets for radiant floor heating in 2 through 12-branch models for 3/8", 1/2" or 5/8" PEX or PEX-AL-PEX.

PEX Plumbing Manifolds

Made in the USA, lead-free compliant PEX copper manifolds with or without valves for hot and cold potable water plumbing. Variety of inlet/outlet sizes & connection options.

About PEX Manifolds

The primary purpose of a PEX pipe manifold is to act as a distribution center in a plumbing or heating system. Select manifold types and models allow users to...

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Plumbing PEX Tubing and Accessories

Plumbing PEX Tubing, PEX Plumbing Fittings, PEX Adatpers, Plumbing PEX Manifolds, PEX Tools, PEX Crimping Tools, PEX Supplies

Water Filters & RO Systems

Water Filters and Reverse Osmosis Filters. Hydrotech Water Filters and John Guest Plumbing Tubing and Fittings.

Water Heater Tanks

Tank type water heaters from 2.5 gallons up to 115 Gallons. Tank Electric Water Heaters, Gas Water Heaters and Propane Waters Heaters

Tankless Water Heaters

On Demand Hot Water Heaters by Bosch, Toyotomi, PowerStar, PowerStream, Stiebel-Eltron, Takagi, Rinnai and Ariston

Sharkbite Lead Free Fittings

Sharkbite Fittings (Push-Fit Type) for Hydronic Heating Systems and Plumbing Systems

Viega Manabloc Plumbing Manifolds


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Called PEX or XLPE, cross-linked polyethylene is flexible plastic tubing that is used for hot- and cold-water plumbing systems and for hot-water heating systems. With the price of copper[1] pipes fluctuating but generally increasing, PEX is considered a less expensive alternative. Because it's flexible and can be snaked through walls, PEX takes less time and labor to install, particularly when re-piping an existing house. Sizes range from 1/4" to 4" in diameter, but common residential sizes are 1/2", 3/4" and 1". The Plastic Pipes and Fittings Association provides an overview of PEX. Typical costs: Re-plumbing a house (installing new lines and abandoning the old ones) with PEX can cost $1,500-$8,000 or more. Re-plumbing costs are typically based on the number of fixtures, with each sink, bathtub, shower, toilet, dishwasher, water heater, etc. counting as one fixture. Total costs also depend on the size of the house, whether it's one story or two, if holes in the walls and...
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Cross-linked polyethylene (PEX) is a form of polyethylene with cross-links.

PEX is made by a process that forms links between polyethylene molecules to create bridges (thus the term "cross-linked). This resulting material is more durable under temperature extremes, chemical attack, and better resists creep deformation, making PEX an excellent material for hot water and other applications. It doesn’t corrode or develop pinhole leaks, is chlorine-resistant, scale-resistant, and has fewer fittings, connections, and elbows than rigid plastic and metallic pipe.

Cross-linked polyethylene (PEX) is a high-temperature, flexible plastic (polymer) pipe. The cross-linking raises the thermal stability of the material under load. Thus, the resistance to environmental stress cracking, creep, and slow crack growth are greatly improved over polyethylene.

The caveat to PEX plumbing is the long-term effect of chlorinated water on the vinyl walls in the tubing remains unknown...

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Sioux Chief manifold with 1" sweat inlet and 1/2" PEX, crimp style, 1/4-turn mini brass ball valve outlets.


Lead-free Type L copper trunk Shut-off ball valves made from lead-free brass Compatible with crimp or cinch PEX connection systems cUPC listed Made in the USA

Technical Specifications:

Left side version (trunk inlet on the right side, trunk outlet is spin closed) Trunk inlet: 1" female sweat (accepts 1" copper pipe) Trunk diameter: 1" copper pipe Branches: 1/2" PEX, crimp style (1/4-turn ball valves) Number of branches: 8 Branch spacing: 2" OC (On Center) Overall size (L x H): 18-1/4" x 4.5"

8-port Copper Manifold with 1/2" PEX Valves, 1" Sweat,...

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For now we have finished the laundry room. The Uponor plumbing is installed, and works, and I just can't believe it! We looked at all the PEX systems and chose Uponor for the Milwaukee tool and the overall high quality. The tool is the pricy part--and we had to scrimp and save a while--but looking back we love the independence and confidence of having our own tool. In fact I just can't see succeeding without our own tool, not on our busy schedules.

Anyhow, the great things about Uponor, and this starter kit, are:
* The tool
* About the right amount of tubing for 1 house
* Uponor quality
* Ease of use
* 1 full baggie of elbows for each tube size
* Downloading user manual from Uponor's site
* Beautiful brass fittings and valves
* We noticed that the Eurozone countries are well represented as manufacturers, and we think this is cool! (tube cutter=France; dropears=Italy; tubing=German engineered; etc.)

You do need to select your own...

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Description for Uponor (Wirsbo) A2670501

Note: This manifold requires 10 Loop Fitting Assemblies (please see below).

The Engineered Plastic (EP) Heating Manifold Assemblies feature isolation valves and balancing valves with flow meters, and come fully assembled, ready for installation. The manifolds are available in 2- through 8-loop configurations. The body ends feature R32 unions and the loop outlets have R20 male threads. The manifold mounts on a bracket (A2670006) that comes with the assembly.
For cost-effective, durable, hydronic radiant systems, Uponor now offers the Engineered Plastic (EP) Heating Manifold. This new manifold is comprised of thermoplastic, high-performance, advanced materials suitable for use under conditions of high impact, heat and moisture. Successfully installed throughout Europe for the past five years, Uponor now offers this innovative new product in the United States and Canada.
This strong, durable manifold is made of an...

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