This is an example of a Residential Gas Boiler Install with PEX Tubing Loops going to Hydronic Radiators.
You will notice that in this example there is one two Grundfos Pumps with ball valves and 2 PEX Manifolds. The radiators temperature is set from the boiler, but you could use a mixing valve to do this if you need a higher or lower temperature for other zones. This would work simalary for PEX Radiant Systems - but you would want to have mixing valves for lowering tempeatures for radiant zones.
Picture 1: Residential Gas Boiler Install with PEX Tubing Loops going to Hydronic Radiators
List of materials needed for a project like this (Click Link below to Purchase Product and see more Information)
Hydronic Heating Side (Trim)
Quantity 1 - Gas or Electric Heating Boiler
Quantity X - Ball Valves for Hydronic Heating Side
Quantity X - Boiler Drain and Hose Bibs
Quantity X - Temperature Guages and Tees
Qunatity 1+ - Hydronic Circulator Switching Relay
Quantity X - Hydronic Heating Thermostats and Floor Sensors
Quantity 1 - Taco Flo Checks Valves
Hydronic Heating Side (Distribution)
X = Various Amounts of Product needed - dependant on actual system