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A1009091 - 661A0600_EN • A
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CHAPTER
2
2.11. Boiler Piping
• All PEX tubing used to connect the indirect tank wa-
ter heater to the boiler must have an oxygen barrier.
• If PEX tubing is used for boiler water piping, it must
have a maximum oxygen diffusion rate of 0.1 mg/
liter-day for boiler and water heater protection.
The MONARCH IDWH must be installed on a
closed loop type hydronic system. Failure to
provide such a system will result in premature
failure of the tank and void the warranty.
• Boiler water (including additives) must be practical-
ly non-toxic, having toxicity rating or class of 1, as
listed in
Clinical Toxicology of Commercial Prod-
ucts, 5th Edition
.
• If antifreeze is used in the boiler system, local codes
may require a backflow preventer on cold water
supply line. Use antifreeze specifically intended for
hydronic heating systems. A maximum percentage
of 50% is allowed for inhibited propylene glycol.
Do not use automotive, ethylene glycol or
petroleum-based antifreeze. Do not use any
undiluted antifreeze. This can cause substan-
tial property damage, serious injury, or death.
NOTICE
DANGER
CHAPTER 2 - INSTALLATION - PIPING
