Every Noritz manual is published on noritz.com under the model number's product page. Printed installation manuals ship in the box with new units.
Where to download
- noritz.com — search by model number; download Installation & Operation Manual plus Owner Manual
- Noritz customer service — 1-877-986-6748 will email any manual within minutes if you have the serial number
- Cascade Installation Manual — separate document for NCC commercial cascade installs
Documents you might need
- Installation Manual — for the installer. Gas line sizing, venting tables, condensate plumbing, electrical, commissioning checklist
- Owner Manual — controller operation, temperature, basic troubleshooting
- Parts Diagram — exploded view with every part numbered. Required for ordering replacement parts
- Spec Sheet — single-page summary used for permits
- Cascade Manual — for NCC commercial cascade installs. Manifold piping, controller wiring, Quick Connect cord routing
- TWA Manual — Twin Pipe Adaptor for venting conversions
Manuals by line
- NRC residential — single master manual for NRC66, NRC83, NRC98, NRC1111
- EZTR series — EZTR40, EZTR50, EZTR75, EZTR111 share one manual
- EZ classic — EZ98, EZ111 (legacy controller)
- NRCB combi — NRCB180, NRCB199 plus separate Hydronic Piping Guide
- NCC commercial — separate manuals for stand-alone NCC1991 and cascade NCC1991/NCC300 configurations
Bottom line
Always use the model-specific Installation Manual — Noritz's venting requirements and gas line sizing are specific to each chassis. For commercial cascade installs, the Cascade Installation Manual is mandatory reference; generic plumber experience isn't a substitute.