2.4.2 Using Propylene Glycol
Using a propylene glycol / water mixture with the boiler/ air handling unit reduces the heating capacity of
the system by up to 10%, and increases the pump head required to circulate the heating fluid. Use a
minimum of 25% to a maximum of 50% mixture.
It is important to install the system with the correct pipe size to achieve optimum heating capacity from the
air handling unit. It is equally important to choose the correct circulator.
2.5 Connecting the unit to a tankless water heater
Check local codes to ensure that piping the unit to a tankless water heater is allowed.
The air handling unit must be installed in close proximity to a tankless water heater. As a guideline, we
recommend a maximum distance of 10 feet between the unit and the tankless water heater using ¾"
copper piping.
The table below provides pipe sizing specifications for IBC's tankless water heater. Refer to other
manufacturer's manuals for correct sizing of pipes.
Note
For pipe sizing, refer to the Installation manual of the water heater manufacturer for boiler
head loss specifications.
Tankless Water Heater Head Loss - SFT 199
Flow rate (gpm) 3 4 5
Head loss @ flow (ft) 14 23 33
Table 7 Tankless water heater head loss: SFT 199
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