Noritz 9.8 GPM 199,900 BTU Commercial Propane Direct Vent Concentric Tankless Water Heater (.82 UEF)

The Noritz NC199-DVC-LP 9.8 GPM 199,900 BTU Commercial Propane Direct Vent Concentric Tankless Water Heater is engineered to deliver dependable, continuous hot water for demanding commercial applications including restaurants, office buildings, salons, multi-family properties, and other light commercial facilities. Unlike traditional storage tank water heaters that can run out of hot water during periods of heavy demand, the NC199-DVC-LP heats water only when needed, providing an endless supply of hot water while reducing standby energy loss.

Designed for indoor installation, the NC199-DVC-LP utilizes a direct vent concentric system that supplies combustion air and exhaust through a single vent assembly, helping simplify installation while maintaining safe operation. Delivering up to 199,900 BTU of propane heating power and a maximum flow rate of 9.8 gallons per minute, this commercial-grade tankless water heater combines reliable performance, compact wall-mounted installation, and advanced temperature controls for years of dependable service.

Product Features:

• 199,900 BTU Maximum Input: Provides powerful propane heating capacity for demanding commercial hot water applications.
• Up to 9.8 GPM Flow Rate: Supplies continuous hot water to multiple fixtures simultaneously depending on incoming water temperature and required temperature rise.
• Commercial Non-Condensing Design: Engineered for dependable commercial operation with a Uniform Energy Factor (UEF) of 0.82.
• Direct Vent Concentric System: Uses a single concentric vent assembly for combustion air intake and exhaust, simplifying indoor installation.
• Commercial Copper Heat Exchanger: Heavy-duty copper heat exchanger is designed for long-lasting commercial durability.
• Multi-System Capability: Compatible with optional Noritz Quick Connect and System Controller accessories for larger commercial installations.
• Wide Temperature Adjustment: Adjustable temperature settings from 100°F to 185°F support a variety of commercial hot water applications.
• Fully Modulating Burner: Automatically adjusts firing rate between approximately 16,000 and 199,900 BTU for consistent temperatures and improved efficiency.
• Electronic Ignition: Eliminates the need for a standing pilot while improving efficiency and reliability.
• Built-In Safety Features: Includes freeze protection, flame monitoring, overheat prevention, lightning protection, and self-diagnostic monitoring.

What Is an Isolation Valve Kit?

An isolation valve kit is recommended for tankless water heater installations. These valves allow the unit to be isolated from the plumbing system for flushing, descaling, maintenance, and servicing without shutting off water to the rest of the building.

Routine flushing helps remove mineral buildup inside the heat exchanger, maintaining efficiency and extending equipment life, especially in areas with hard water.

Short vs. Long Isolation Valve Kit

Only one isolation valve kit is required for the NC199-DVC-LP depending on your installation layout.

• IK-WV-200-5-TH-S Short Isolation Valve Kit: Ideal where installation space is limited.
• IK-WV-200-5-TH-L Long Isolation Valve Kit: Provides additional clearance for easier servicing.

Both kits include 3/4" threaded isolation valves and a lead-free pressure relief valve.

Understanding Tankless Water Heater Sizing

Tankless water heaters are sized using flow rate (GPM) and temperature rise rather than tank capacity. Always size using your area's winter groundwater temperature since colder incoming water requires more heating.

For example, if your desired hot water temperature is 120°F and incoming groundwater is 50°F, the required temperature rise is:

120°F − 50°F = 70°F Temperature Rise

Consult the manufacturer's flow rate chart to determine expected hot water output at your required temperature rise.

Warranty

This product includes Noritz's commercial limited warranty featuring a 5-year heat exchanger warranty, 5-year parts warranty, and 1-year labor warranty for qualifying commercial installations. Always verify propane fuel supply, venting requirements, gas pressure, water quality, local plumbing codes, and required accessories before installation.