IBC SL 20-160 G3 - Gas Piping Requirements; Gas Pressure Regulation Notes

Optional
Domestic water, hot and cold:A thermostatic tempering valve may be required by
local code.
Indirect hot water tank
Figure 40 Indirect domestic hot water - piping concept
Optional
Thermostatic mixing valve
Figure 41 Two sided piping, DHWand space heating - piping concept
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Section: Installation