NTI Boiler: Glycol limits for DHW and IWH loops
Glycol limits for DHW and IWH loops on a NTI boiler: Use only food grade propylene glycol rated GRAS for indirect water heater loops. Glycol content must not exceed 50% unless the manufacturer says otherwise. Non-GRAS glycol is only allowed in closed loop CH applications. Check glycol periodically so it does not turn acidic. Never use automotive or standard ethylene glycol.
Applies to: TRX boilers with glycol
How to fix glycol limits for dhw and iwh loops: step by step
- Use food grade propylene glycol (GRAS) for IWH loops.
- Keep glycol at or below 50% of the liquid.
- Test glycol periodically for acidity.
If the unit shows an error code, look it up: NTI Boiler codes
Models
TRX085TRX110CTRX150TRX199TRX199C
Source: NTI TRX150 manual, p. 8. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.