This is an example of how to use a Gas Boiler to produce different water temperatures for 5 zones (High / Low Temperatures) plus a zone for the Indirect Hot Water Tank.
You will notice that in this example there are 3 possible temperatures for the heating zones. There are 3 zones for high temperature that can feed radiators or baseboard convectors at whatever the boiler water temperatures is set to. There are 2 zones for a set temperature that could be used for pex radiant heat zones at different water temperatures.
This is only an example. Actual layouts vary from job to job.
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 1 - Indirect Storage Tank
Quantity 2 - Hydronic Heating Mixing Valves
Quantity 5 to 7 - Ball Valves for Hydronic Heating Side
Quantity 5 to 7 - Boiler Drain and Hose Bibs
Quantity 1 - Temperature Guages and Pressure Gauages and Tees
Quantity 5 - Hydronic Heating Mixing Valves
Qunatity 1+ - Hydronic Circulator Switching Relay
Quantity 5+ - 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