Bosch SST150-40 Installation And Operating Manual page 20

Installation & Operating Manual
If antifreeze is used in the boiler water, check
concentration. Boiler water (including additives) must be
practically non-toxic, having a toxicity rating or class of 1,
as listed in the "Clinical Toxicology of Commercial
Products". A maximum 50/50 mixture of inhibited
propylene glycol is recommended. Follow the antifreeze
manufacturer's instructions.
DANGER:
Do not use automotive, ethylene glycol or
petroleum-based antifreeze. These types of
antifreezes are toxic and could cause severe
personal injury or death if leakage into the
domestic hot water supply occurs. Do not
use any undiluted antifreeze. This can cause
severe personal injury, death, or substantial
property damage.
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Indirect Fired Water Heaters Installation and Operating Manual