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System Heating Boiler in Primary Secondary Heating Loops

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 could also use an Electric Boiler, Propane Boiler or Oil Boiler in this configuration. In the below diagram - the boiler has a buit-in pump and this pump will act as the Primary Pump for Primary Loop.

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 hydronic radiators or hydronic 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 floor heat zones at 2 different water temperatures.

Hydronic heating system boiler for different tempeature heating zones with a system boiler

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 Boilers

Quantity 2 - Hydronic Heating Mixing Valves

Quantity 5 to 7 - Ball Valves for Hydronic Heating Side

Quantity 4 to 6 - Boiler Drain and Hose Bibs

Quantity 8 - Temperature Guages and Tees

Quantity 1 - Webstone ProPal Series 5865 Primary Secondary Loop Purge Tee

Quantity 1 - Hydronic Heating Expansion Tanks (May already be in boiler)

Quantity 4 - Cast Iron Pump (For Secondary Loop - Amount of Pump Depends on System)

Quantity 4 - Pump Flanges (For Secondary Loop Side and Most Likely 3/4 Inch)

Qunatity 1+ - Hydronic Circulator Switching Relay

Quantity 4+ - Hydronic Heating Thermostats and Floor Sensors

Quantity 1 - Hydronic BackFlow Preventers and Combo AutoFill Valves

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

Quantity 1 - Hydronic Boiler Pressure Relief Valves and Water Heater Relief Valves

Quantity 1 - Taco Flo Checks Valves


Hydronic Heating Side (Distribution)

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

Quantity X - Hydronic Radiators and Convectors (Depends on System)


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