8-Loop Stainless Steel Radiant Heat Manifold Zoom

8-Loop Stainless Steel Radiant Heat Manifold


Brand: Rifeng

RHM08 has been discontinued.
Direct Replacement:
Brand: Bulldog



Number of Outlets: 8
PEX Size: 1/2"
Main Inlet Size: 1" FPT
Sub Inlet Size: 3/4"
Loop Thread: EK20
Temperature Range (F): 0°-185°F
Max Temp (F): 194°F
Material: Stainless Steel
Application: Heating
Fitting System Compatibility: PEX Compression
PEX-AL-PEX Compression
Tubing Compatibility: PEX-AL-PEX
Standards Met: CSA B137.5

Description for Rifeng RHM08


  • Flexible, modular and singular design system
  • Easy-to-assemble construction
  • Precise flow control and balancing
  • Fitting for both PEX and Multilayer Pipe
  • Control for the dominant heating systems like hydronic floor heating, fan coil heating or baseboard heating.
  • No Sealant or Teflon required
NOTE: Includes supply/return shut-off valves with temperature wells

This manifold requires (16) Loop Fitting Assemblies:

PEX Loop Fitting Assemblies Options
PEX-AL-PEX Loop Fitting Assemblies Options
Optional Installation Accessories:

Loop End Cap
  • MA-ACT: Thermal Actuator for Rifeng Manifolds
    If you want to use your manifold to heat multiple zones, you can purchase return side actuators that work along side thermostats. The actuators act as zone valves to allow you to use one manifold to control the temperature in different rooms independently.
Supply/Return Adapter Options

Note: Bleeder valves that come equipped with Rifeng Manifolds are 1" BSP Thread (manifold inlet) x 3/4" BSP Thread (outlet). If your application requires you to connect to a garden hose, you will need to purchase a Mr. PEX Manifold End Cap w/ Swivel Fill-Drain Valve separately which is 1" BSP x 3/4" Hose Thread

8-Loop Stainless Steel Radiant Heat Manifold


by PowerReviews

(based on 3 reviews)

Ratings Distribution

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  • 1 Stars




of respondents would recommend this to a friend.

Reviewed by 3 customers

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Solid units, work well

By Snowman

from Salt Lake City, Utah

Verified Buyer

Comments about 8-Loop Stainless Steel Radiant Heat Manifold:

I purchased 4 of these (3, 5, 7, & 8 loops) and installed them myself. I am not a plumber, but managed to get them in without too much difficulty. Do be aware that they are large (much bigger then the old INFLOOR units I replaced), but that they seem to be about the same size as other brands with similar function. They also seem to be less expensive due to the stainless steel bodies rather than brass.

The units are very solid in construction, and offer excellent bleed / flush ports, and also valves to isolate the unit completely. The also have thermo-wells which is a nice touch, but i noticed that the body of one of mine was loose on the stem so I would not be too dependent upon their accuracy.

Do be sure to check the size of your PEX hydronic heat lines (mine are 3.8" so I had to buy those fittings - the default that come with them are 1/2". Also, if you are using 3/8" PEX loops, my plumber (who I had check my work), suggested not to throttle the flow valves back at all as the flow rates are so low that any impedance could cause improper heating. He also pointed out that the manifolds themselves will distribute the flow well due to their large volume so throttling should not be necessary anyway.

You should also be sure to use a 1" male brass fitting on each of the inlets and outlets (actually the valve body) as I was unable to get seals with copper fittings (maybe just me - again I am not a plumber, but the brass units worked perfectly first time).

You should also be aware that the valve end of the manifold is a bit fiddly when it comes to leak stoppage as you have a sequence of a rubber seal, nylon seal and pipe thread all in just a few inches - but I did get them all to seal and I am sure better plumbers than I will do it without worry. You will need two large crescent wrenches (or a crescent and a pipe wrench) to tighten up this bit if you care about the final position of the valve handle and thermo-well (tough to explain - you will see what I mean when you do it yourself).

I did have one fault on the 7 loop unit, and that was a very slow leak around the seal on the flowmeter. PEX Supply replaced the unit without question and the replacement works fine.

Overall- good product, I only market the unit down due to the one leaking flow meter (which required removing the whole unit from a very tight opening in a wall cavity in my home), and the unreliable thermo-well.


I am not a plumber


from Seattle

Verified Buyer

Comments about 8-Loop Stainless Steel Radiant Heat Manifold:

First off I am not a plumber but i managed to hook up multi-zone heating with this manifold and 5/8 Pex without any issue. The compression fittings worked great and are very very easy to install. A truely great product.


Excellent manifold

By bkhitech

from Peachtree City, GA

Verified Buyer

Comments about 8-Loop Stainless Steel Radiant Heat Manifold:

The product itself is a great choice, Adjustment wrench supplied looks great and fittings for PEX tubing was also supplied. Only problem was packing both of the temp gauges were bent and when I went to straightnen one of the faces it broke off. But I would recomend this product.

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2 Questions | 2 Answers
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  • Q:

    Can this manifold be changed on the inlet/outlet piping to come in on either side?
    Asked on 1/30/2015 by Bruce from Saratoga Wy

    1 answer



      Yes, it can.

      Answered on 2/26/2015 by SupplyHouse Staff from NY
  • 8-Loop Stainless Steel Radiant Heat Manifold


    What is the width of the RHM08(with temp well installed)?
    Asked on 10/17/2012 by Patty Mayonaisse

    1 answer



      The RHM08 is 19.5" long and the ball valves add another 4" to that if you use them.

      Answered on 10/17/2012 by PexSupply Staff from NY
Displaying questions 1-2

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