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How to Install a PEX Manifold for Radiant or Domestic Potable Water

Hot to Install a PEX Manifold with pex tubing for radiant heating and domestic Water to a Wall Hung Gas Combi Boiler like we sell. Since it's a is a combi boiler - you get domestic hot water going into a plumbing pex manifold for potable domestic water. This diagram would also be applicable for other Combination Hot Water Boilers.  The one thing wrong with this picture is that there is no Primary Loop which is required with all boilers today.

Embassy Ambassador Boiler Installation with PEX Tubing for Radiant Heating and Plumbing

The Radiant Heat Manifold is on the Left and has 8 Loops and takes heated water directly out of the boiler. You can do this because this is a Condensing boiler and boiler can be set how ever low you want. If you have 2 temperature zones, then you would set the boiler for the highest zone temperature and then add a mixing valve to reduce the PEX Tubing Loop(s).

The Plumbing Manifold is on the right and 24 Ports for cold and hot water. You can use 1/2 or 3/8 inch Plumbing PEX or a combo of the two.

The boiler, in this example, is an Embassy ONEX Condensing Combi Boiler - which means - it can heat your house and provide domestic hot water. At over 95% efficiency.

List of materials needed for a project like this (Click Link below to Purchase Product and see more Information)

Domestic Hot Water Side

Quantity X - Viega Plumbing PEX Manifold for Domestic Water (Size Depends on System)

Quantity X - HousePEX and Legend Tubing for Domestic Water

Quantity 2 to 4 - Ball Valves for Domestic Water Side

Quantity 1 to 2 - Boiler Drain and Hose Bibs

Quantity 1 - Pressure Relief Valves

Quantity 1 - Expansion Tanks for Domestic Water

Quantity 1 - Hydronic Heating Mixing Valves for Domestic Water 

Quantity X - Copper Fitting and Sharkbite Quick Connect Fittings


Hydronic Heating Side (Trim)

Quantity 1 - Hydronic Heating Mixing Valves (Optional)

Quantity 2 to 4 - Ball Valves for Hydronic Heating Side

Quantity 2 to 3 - Boiler Drain and Hose Bibs

Quantity X - Temperature Guages and Tees (Optional)

Quantity 1 - Hydronic Heating Expansion Tank (Optional - Some boilers have one built in)

Quantity 1 - Cast Iron Pump (For Heating Side and Depends on System)

Quantity 1 - Pump Flanges (For Heating Side and Most Likely 3/4 Inch)

Qunatity 1 - Hydronic Circulator Switching Relay

Quantity 1 - Hydronic Heating Thermostats and Floor Sensors

Quantity 1 - Hydronic BackFlow Preventers and Combo AutoFill Valves

Quantity X - Pipe and Fittings for Primary Loop (Not Shown)

Quantity 1 - Hydronic Air Eliminators, Air Separators, Air Scoops and Dirt Separators

Quantity 1 - Hydronic BackFlow Preventers and AutoFill Valves

Quantity ? - Hydronic Radiant Heat Pex Tubing (Depends on Systyem)


Quantity X - HousePEX PEX-A Pex Tubing for Radiant Heating

Quantity 1 - PEX Radiant Heating Manifolds (In this Example)

Quantity X - Pipe Support Accessories

Quantity X - PEX Tubing Accessories


X = Various Amounts of Product needed - dependant on actual system