IBC VX Series Installation & Operating Manual page 54

The boilers can supply multiple heating loads with compatible supply temperature
requirements. Always ensure that loads sensitive to high temperatures are protected using
means such as mixing valves.
Supply to heating system.
Secondary loop sensor (to master boiler).
Closely-spaced tees are a maximum of four pipe diameters apart, with a minimum of
eight pipe diameters of straight piping upstream of the first tee and a minimum of four
pipe diameters of straight piping downstream of the second tee.
Return from heating system.
Figure 38 Multiple boiler piping
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Section: Installation