Rinnai N1600i 58.4 kW Internal Condensing Gas Water Heater | LPG

Rinnai N1600i gas water heater

The Rinnai N1600i 58.4 kW Internal Condensing Gas Water Heater is a high-capacity commercial continuous-flow water heating solution designed for professionally engineered hot-water systems.

Part of the Rinnai N Series, the N1600i uses condensing technology, automatic output variation, Low-NOx burner technology and a stainless-steel primary heat exchanger. The appliance is designed for internal installation and uses a forced room-sealed flue system. Rinnai identifies the N1600i by model reference REU-N3237FFC.

Key Features

• 58.4 kW-class commercial gas water heater
• Rinnai N1600i
• Manufacturer model reference REU-N3237FFC
• Internal installation
• Condensing instantaneous operation
• Automatic output variation
• LPG and Natural Gas configurations
• Low-NOx burner technology
• Stainless-steel primary heat exchanger
• 13:1 turndown ratio
• Direct electronic ignition
• Forced room-sealed flue system
• Continuous-flow hot-water production
• Cascade capability
• Designed for commercial high-demand hot-water systems

58.4 kW Commercial Condensing Water Heater

The Rinnai N1600i is designed for commercial properties requiring substantial hot-water capacity from a compact continuous-flow appliance.

Rather than storing a large volume of hot water inside the appliance, the N1600i heats water as demand occurs. Its automatic output variation allows the appliance to adjust operation according to hot-water demand.

Rinnai lists the N1600i as a 58 kW-class internal commercial tankless water heater, with approximately 954 litres per hour at a 50°C temperature rise.

Internal Installation

The N1600i is designed for internal installation, unlike the N1600e external model.

Rinnai specifies the N1600i as an internally installed appliance using a forced room-sealed flue system. This makes the N1600i suitable for professionally designed plant rooms and other appropriate internal commercial installations where the required ventilation, flue, gas and condensate arrangements can be provided.

Low-NOx Gas Water Heater

The N1600i incorporates Rinnai’s Low-NOx burner technology.

Low-NOx combustion is an important consideration for commercial heating and hot-water projects where applicable emissions requirements need to be taken into account.

The exact emissions performance should be checked against the current technical specification for the gas configuration being installed.

Stainless-Steel Heat Exchanger

The Rinnai N Series uses a stainless-steel primary heat exchanger.

Rinnai identifies the stainless-steel heat exchanger as a key feature of its commercial N Series, designed to provide durability and support long-term continuous-flow operation.

13:1 Turndown Ratio

The N1600i features a 13:1 turndown ratio.

Automatic modulation allows the appliance to adjust its output according to changing hot-water requirements rather than simply operating continuously at maximum output.

This is particularly useful in commercial environments where hot-water demand can vary significantly during the day. Rinnai identifies the N Series 13:1 turndown ratio as one of its key features.

LPG and Natural Gas Configurations

The Rinnai N1600i range supports different gas configurations, including LPG and Natural Gas, depending on the specific appliance configuration.

This product should be sold and specified according to the exact gas configuration supplied.

Before ordering, confirm:

• Gas type
• Gas pressure
• Gas supply capacity
• Appliance configuration
• Local installation requirements
• Required conversion equipment, if applicable

Any gas conversion or commissioning must be completed by an appropriately qualified professional.

Up to 37 L/min Hot-Water Flow

The N1600 range is capable of high-volume continuous-flow hot-water production.

Rinnai’s N Series documentation identifies the N1600 range at approximately 954 L/h at a 50°C temperature rise, while product documentation and market specifications can show maximum flow figures depending on the operating configuration.

Actual flow depends on:

• Incoming cold-water temperature
• Required outlet temperature
• Water pressure
• Gas supply
• Appliance configuration
• Installation conditions

For this reason, the system should be sized according to the project’s actual peak hot-water demand rather than relying only on a maximum advertised flow figure.

Continuous-Flow Commercial Hot Water

The N1600i is designed to provide hot water as it is required.

This makes continuous-flow technology particularly useful for commercial properties where demand can change throughout the day.

Potential applications include:

• Hotels
• Restaurants
• Commercial kitchens
• Bars
• Gyms
• Leisure centres
• Healthcare facilities
• Food production
• Brewing
• Agricultural businesses
• Industrial facilities
• Commercial accommodation
• Other high-demand hot-water installations

The correct system design should always be based on peak demand, temperature rise and local installation requirements.

Cascade Commercial Hot-Water Systems

Multiple Rinnai N Series water heaters can be configured in cascade systems where additional hot-water capacity is required.

Rinnai states that its N Series can be cascaded to supply larger hot-water demands.

Cascade installations can be useful for larger commercial developments where a single appliance may not provide sufficient peak capacity.

A qualified heating-system designer should determine the number of units required.

Forced Room-Sealed Flue System

The N1600i uses a forced room-sealed flue system.

This is an important distinction between the N1600i internal model and the N1600e external model. Rinnai’s technical documentation specifically identifies:

• N1600i: Internal installation / Forced Room Sealed
• N1600e: External installation / Direct Forced Exhaust

The flue system must be designed and installed according to the manufacturer’s instructions and applicable local regulations.

Electronic Ignition

The N1600i uses direct electronic ignition.

This is part of the appliance’s automatic operating system and works with the heater’s control and modulation system.

Technical Specifications

Always verify the final technical specification against the manufacturer’s current documentation and the exact gas configuration before installation.

Rinnai N1600i vs N1600e

The Rinnai N1600i and N1600e are closely related commercial water-heater models but are designed for different installation environments.

N1600i:

• Internal installation
• Forced room-sealed flue
• Model reference REU-N3237FFC

N1600e:

• External installation
• Direct forced exhaust
• Model reference REU-N3237WC

Rinnai’s documentation clearly distinguishes the internal N1600i from the external N1600e.

Choose the model that matches the building’s available plant-room space, flue arrangement and installation requirements.

Rinnai N1600i for European Commercial Projects

The Rinnai N1600i 58.4 kW Internal Condensing Gas Water Heater is suitable for consideration in European commercial hot-water projects where a high-capacity continuous-flow system is required.

Its combination of condensing operation, Low-NOx technology, automatic output variation, stainless-steel heat exchanger and cascade capability makes it appropriate for professionally designed commercial hot-water systems.

EuroFuelSupply supplies heating, hot-water and energy products to customers across supported European markets.

For commercial projects, installers, developers and multi-unit requirements, contact EuroFuelSupply for product availability and project enquiries.

Professional Installation

The Rinnai N1600i is a commercial gas appliance and must be installed, commissioned and serviced by appropriately qualified professionals.

Before ordering, the installer should confirm:

• LPG or Natural Gas configuration
• Gas supply capacity
• Gas pressure
• Peak hot-water demand
• Incoming water temperature
• Required hot-water temperature
• Water pressure
• Flue configuration
• Condensate drainage
• Internal installation requirements
• Electrical supply
• Local gas regulations
• Building regulations
• Cascade requirements

Do not attempt to install, convert or commission the appliance without the appropriate professional qualifications.

Frequently Asked Questions

What is the Rinnai N1600i?

The Rinnai N1600i is an internal commercial condensing instantaneous gas water heater in the Rinnai N Series.

What is the model number of the Rinnai N1600i?

The manufacturer’s technical documentation identifies the N1600i as REU-N3237FFC.

How powerful is the Rinnai N1600i?

The N1600i is a 58 kW-class commercial gas water heater. Rinnai documentation specifies nominal operating capacities according to gas type and operating conditions.

Is the Rinnai N1600i an LPG water heater?

The N1600i range supports LPG configurations. The exact gas configuration must be confirmed before ordering and installation.

Can the Rinnai N1600i use Natural Gas?

Yes. Rinnai’s technical documentation includes Natural Gas configurations for the N1600i.

Is the Rinnai N1600i Low-NOx?

Yes. The Rinnai N Series incorporates Low-NOx burner technology.

Is the N1600i an internal water heater?

Yes. Rinnai identifies the N1600i as the internal version, while the N1600e is the external model.

Does the N1600i use a storage tank?

No. It is a continuous-flow or instantaneous water heater that heats water as demand occurs.

Can multiple N1600i units be cascaded?

Yes. Rinnai states that N Series water heaters can be cascaded for higher hot-water demand.

What is the N1600i flow rate?

Flow depends on the operating conditions and gas configuration. Rinnai lists the N1600 range at approximately 954 L/h at a 50°C temperature rise.

What type of flue does the N1600i use?

The N1600i uses a forced room-sealed flue system.

Does the N1600i require professional installation?

Yes. Gas, water, flue, condensate and electrical connections must be installed and commissioned by appropriately qualified professionals in accordance with manufacturer instructions and local regulations.