Index
Figure 6: Commercial Unit with Auxiliary Booster Heater - Two Temperature (With or Without Building Recirculation)
Outlet |
| Hot Water |
Boosted |
| to Fixtures |
Temperature |
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Thermometer | ||
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| Temperature and |
Thermometer |
| Pressure Relief Valve |
Temperature and |
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Pressure Relief Valve |
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Typical | Check Valve | |
Booster |
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Heater |
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| Thermal |
| Expansion | |
| Tank | |
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Water to |
the Booster |
1 1/2” Cold water supply
Pressure 
Reducing
Valve
Note: Install a vacuum relief valve if required by local codes.
Figure 7: Commercial Unit with Auxiliary Storage Heater - Forced Circulation With or Without
Building Recirculation - Front Inlet/Outlet Connections
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| Hot Water | |
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| Outlet | |
Thermometer |
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| Storage Tank | |
| Temperature and |
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Pressure Relief Valve |
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Thermal | Temperature | ||
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| Expansion | ||
| and Pressure | ||
| Tank | ||
| Relief Valve | ||
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Heater
Pressure |
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Reducing |
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Valve |
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| 1 1/2” Cold | ||||
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| water supply | |
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Plug | Check | Note: Install a vacuum | ||
Cock | Valve | |||
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| Circulating | relief valve if required | ||
| Pump |
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| by local codes. | |
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