Noritz Ultra-High Efficiency Commercial-Grade Condensing Tankless Water Heater, 11.1 GPM

The Noritz GQ-C3261WZ-FF-US-NG is a commercial-grade condensing tankless water heater engineered for high-demand residential applications. Running on natural gas with a 199,900 BTU input, it delivers 96% thermal efficiency by pulling maximum heat out of exhaust gases before venting. Designed to handle high draw rates without pressure drops, this indoor unit simplifies installation for contractors through flexible, CSA-approved common venting.

Key Features

199,900 BTU Input

High-output burner delivers continuous hot water across multi-fixture residential installs without losing temp.

Up to 11.1 GPM Flow Rate

Maintains steady flow rates and consistent output temperatures during peak simultaneous household usage.

96% Thermal Efficiency

Condensing design extracts latent heat from flue gas to lower operating costs and maximize fuel efficiency.

CSA-Approved Common Venting

Certified to vent up to six units together using standard Schedule 40 PVC, CPVC, or polypropylene pipe.

ENERGY STAR Certified

Meets strict federal efficiency benchmarks, making job installs eligible for local utility rebates.

Product Details

• Fuel Type: Natural Gas (NG)
• Max Flow Rate: 11.1 GPM
• Input Rating: 199,900 BTU/h
• Thermal Efficiency: 96%
• Venting: Indoor Forced Draft / Direct Vent (Common vent up to 6 units)
• Venting Material: PVC, CPVC, Polypropylene
• Ignition: Direct Spark Ignition
• Certifications: CSA Approved, ENERGY STAR Certified

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Additional Information

• Brand: Noritz
• MPN: GQ-C3261WZ-FF-US-NG
• SKU: NORNCC199CDVNGPRO

Noritz GQ-C3261WZ-FF-US-NG FAQ

What size gas line is required for this unit?

Like most 199,900 BTU tankless units, gas line sizing depends on total run length and gas supply pressure; refer to the Noritz sizing table to determine if 1/2-inch or 3/4-inch gas pipe is required.

What venting materials are approved for installation?

This unit is approved for Schedule 40 PVC, CPVC, and polypropylene venting pipe.

Is this model rated for indoor or outdoor installation?

This model (FF) is engineered specifically for indoor direct-vent installations.

Can multiple units be manifolded together?

Yes, up to six units can be common-vented and linked together to scale up total GPM output for larger jobs.

Is this unit factory-set for Propane or Natural Gas?

The GQ-C3261WZ-FF-US-NG is factory-configured out of the box for Natural Gas only.

Weight	85.0 lb
Height	24.00 in.
Horse Power	1/3
Length	18.00 in.
Room	Utility
Type	Water Heater Only
Width	9.00 in.
Inventory Number	NORNCC199CDVNGPRO
MPN	GQ-C3261WZ-FF-US-NG