Hot to Install a PEX Manifold with pex tubing for radiant heating and domestic Water to a Wall Hung Gas Boiler like our Embassy ONEX Boiler. 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 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.