NTI Boiler: Vent insulation and material rules near the boiler
Vent insulation and material rules near the boiler on a NTI boiler: Some insulation and pipe materials are not allowed close to the boiler because they can overheat and fail.
Applies to: Exhaust vent routing and insulation
How to fix vent insulation and material rules near the boiler: step by step
- Do not insulate the first 3 linear feet of exhaust vent.
- Do not insulate PVC, CPVC or polypropylene exhaust pipe.
- Use CPVC, polypropylene or stainless steel for the first 3 linear feet if that run passes through an enclosed space longer than 6 inches, such as a wall or ceiling.
- If you use CPVC or polypropylene or stainless steel for that run, use the same material for the rest of the vent run, except CPVC can be followed by PVC.
- Do not insulate non-metallic vent pipe or fittings.
- Keep at least 8 inches from high heat sources at 100°F or more, such as flue pipes or space heaters.
- Only stainless steel exhaust pipe may be insulated, and a double-wall vent can be used in freezing climates.
Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.
If the unit shows an error code, look it up: NTI Boiler codes
Models
TRX085TRX110CTRX150TRX199TRX199C
Source: NTI TRX150 manual, p. 33. 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.