Hot Water Boiler with Primary / Secondary Hydronic Heating Loops with 3 Temperature Heating Zone

Click on the link above for the diagram.

This is an example of how to get different temperatures from a set temperature heat source. This is an example of how to use a Gas Boiler to produce different water temperatures for 4 zones (High / Low Temperatures)..

You will notice that in this example there are 3 possible water temperatures for the heating zones. There is 1 zone for high temperature that can feed radiators or baseboard convectors at whatever the boiler temperatures is set to. There are 2 zones for a set temperature that could be used for pex radiant heat zones at 2 different water temperatures.

This is only an example. Actual layouts vary from job to job.