Rinnai N1600e 58 kW External Condensing Gas Water Heater | LPG & Natural Gas

Rinnai N1600e external condensing gas water heater

The Rinnai N1600e external condensing gas water heater is a high-output commercial continuous-flow water heating system designed for properties requiring reliable hot water during periods of high or variable demand.

Part of Rinnai’s N Series commercial water heater range, the N1600e is designed for external installation and uses condensing technology, automatic output modulation and a stainless-steel primary heat exchanger.

The N1600 commercial model is rated at approximately 58 kW, while Rinnai states that the N1600 can produce up to 37 litres per minute under standard conditions. A flow-booster setting can provide higher flow when the specified water-pressure and temperature conditions are met.

Key Features

• Rinnai N1600e external commercial water heater
• Approximately 58 kW maximum output
• Condensing instantaneous water-heating technology
• Continuous-flow hot water
• External wall-mounted installation
• Natural gas configuration available
• LPG configuration available with appropriate conversion equipment
• Stainless-steel primary heat exchanger
• Low-NOx burner technology
• Automatic output modulation
• 13:1 turndown ratio
• Electronic ignition
• Direct forced-exhaust system
• Built-in flue damper
• Cascade capability for larger installations
• Designed for high-demand commercial hot-water applications
• Rinnai N Series commercial technology

Rinnai describes the N Series as a hydrogen-blend-ready and BioLPG-ready commercial continuous-flow water-heating range, with the N1600e specifically designed for external installation.

What Is the Rinnai N1600e?

The Rinnai N1600e is an externally mounted commercial continuous-flow gas water heater.

Unlike a traditional storage water heater, the system heats water as it passes through the appliance rather than relying on a large hot-water storage tank.

This makes the N1600e particularly useful for commercial premises where hot-water demand can vary significantly throughout the day.

Typical applications include:

• Hotels
• Restaurants
• Cafés
• Sports facilities
• Gyms
• Leisure centres
• Healthcare facilities
• Schools
• Care facilities
• Commercial kitchens
• Apartment developments
• Industrial premises
• Food-production facilities
• Agricultural applications

The correct number of units should be determined from the property’s hot-water demand, incoming water temperature, desired outlet temperature and available gas supply.

58 kW Commercial Hot Water Output

The Rinnai N1600 is part of Rinnai’s high-output N Series commercial water-heater range.

Rinnai lists the N1600 at approximately 58 kW, with the N Series capable of delivering high volumes of accurately controlled hot water.

This makes the N1600e suitable for applications where a conventional small domestic water heater would not provide sufficient hot-water capacity.

For larger facilities, multiple N1600e units can also be configured in a cascade arrangement to increase overall hot-water production.

Continuous-Flow Hot Water

The N1600e uses instantaneous water-heating technology.

Water is heated as it passes through the appliance, rather than being stored in a large cylinder.

This design can provide several practical advantages for commercial users:

• Hot water available when required
• No large storage cylinder required for the appliance itself
• Reduced reliance on stored hot-water capacity
• Automatic output modulation
• High flow capability
• Suitable for variable demand
• Scalable through cascade installation

Actual performance depends on water temperature rise, inlet temperature, water pressure, gas supply and system configuration.

Water Flow Rate

Rinnai states that the N1600 can produce up to 37 litres per minute under its specified conditions. The product also has a flow-booster setting that can allow higher flow when the required dynamic water pressure and temperature conditions are met.

Therefore, the N1600e should not simply be marketed as a fixed 42 L/min appliance under every operating condition.

For professional system design, the required flow rate should be calculated from the expected water demand and temperature rise.

External Installation

The N1600e is specifically designed for external installation.

Rinnai’s technical documentation identifies:

N1600e — REU-N3237WC

as the external model, while the corresponding N1600i is the internal version.

External installation can be particularly useful for commercial buildings where internal plant-room space is limited.

The installer must ensure that the selected installation location satisfies Rinnai’s clearance, ventilation, flue, gas, condensate and weather-exposure requirements.

Natural Gas and LPG

The N1600e is available in configurations for natural gas and LPG, subject to the exact supplied model and conversion requirements.

Your product configuration should clearly distinguish between:

• Natural gas version
• LPG version / LPG conversion configuration

The current EuroFuelSupply page offers a natural-gas option and an LPG option supplied with an LPG conversion kit.

Always confirm the actual gas type and supplied configuration before installation.

Condensing Technology

The Rinnai N1600e uses condensing water-heating technology.

The system is designed to recover additional heat from combustion gases, helping improve thermal efficiency compared with conventional non-condensing water-heating technology.

Actual efficiency depends on operating temperatures, inlet-water temperature, installation conditions, gas type and system design.

Stainless-Steel Heat Exchanger

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

Rinnai highlights the stainless-steel heat exchanger as a durability feature and states that the N Series is supported by extended warranty options depending on the applicable product and warranty terms.

This makes the N1600e particularly suited to commercial environments where the water heater may experience frequent operation.

Low-NOx Burner Technology

The N Series uses advanced Low-NOx burner technology.

Rinnai states that the N Series incorporates patented burner technology and identifies the range as designed to meet modern emissions requirements.

The current EuroFuelSupply product page lists the N1600e at less than 20 ppm NOx.

Actual emissions depend on the exact configuration and applicable operating conditions.

13:1 Turndown Ratio

The Rinnai N Series uses a 13:1 turndown ratio.

This allows the appliance to modulate its output in response to changing hot-water demand rather than simply operating at one fixed output.

Rinnai identifies the 13:1 turndown ratio as one of the key features of its N Series commercial water heaters.

This is particularly useful for commercial applications where demand can vary throughout the day.

Accurate Hot-Water Temperature Control

Rinnai states that its N Series can deliver hot water with temperature accuracy of approximately ±1°C of the heater set point under the specified conditions.

This type of temperature control can be valuable in applications where consistent hot-water delivery is important.

The actual outlet temperature will depend on the controller, selected set point, inlet temperature, flow rate and system configuration.

Temperature Settings

Rinnai’s technical documentation lists temperature settings for the N1600 system ranging from approximately 37°C to 85°C, depending on the control method and configuration.

The installer should configure the appliance according to the intended application and applicable safety requirements.

Long Flue Flexibility

The N Series incorporates a powerful fan motor and built-in flue damper.

Rinnai states that the system can achieve flue runs of up to 46 metres when using the specified 80/125 concentric flue arrangement, subject to the applicable installation requirements.

Flue length, fittings, termination and installation configuration must always be checked against the current Rinnai installation manual.

Cascade Installation for High-Demand Applications

One of the major advantages of the N1600e for commercial projects is the ability to install multiple units in a cascade configuration.

Multiple Rinnai N Series water heaters can be combined to increase hot-water capacity for larger applications.

Cascade installations can be considered for:

Hotels

High simultaneous demand from showers, kitchens and guest facilities can require scalable hot-water production.

Gyms and Leisure Centres

Multiple showers and changing-room facilities can create significant peak demand.

Care and Healthcare Facilities

Reliable hot-water availability can be important across multiple outlets and service areas.

Restaurants and Commercial Kitchens

Kitchen sinks, dishwashing and cleaning operations can create substantial intermittent demand.

Apartment Developments

Multiple N1600e units can be considered where a central commercial hot-water system is required.

Technical Specifications for Rinnai N1600e external condensing gas water heater

Rinnai’s current technical documentation confirms the N1600e external configuration, while the current EuroFuelSupply page provides additional product-specific installation data.

Dimensions

The current EuroFuelSupply page lists the N1600e dimensions as approximately:

670 mm × 470 mm × 222 mm

with a listed weight of approximately 28 kg.

Rinnai documentation lists the N1600 at approximately 29 kg, so the final product page should use the exact dimensions and weight from the supplied model’s current technical sheet.

Commercial Applications

The Rinnai N1600e can be considered for a wide range of commercial hot-water applications.

Hotels and Hospitality

Suitable for projects requiring substantial and variable hot-water demand.

Restaurants

Provides continuous-flow hot water for kitchens, washrooms and cleaning applications.

Gyms and Sports Facilities

Suitable for facilities with simultaneous shower demand.

Schools and Care Facilities

Can be used in professionally designed commercial hot-water systems.

Industrial and Agricultural Buildings

The high-output configuration can be considered where significant hot-water demand exists.

Multi-Unit Developments

Multiple N1600e appliances can be combined for larger projects.

Why Choose the Rinnai N1600e?

The Rinnai N1600e combines high output with a compact external installation format.

Key advantages include:

• Approximately 58 kW output
• Continuous-flow hot water
• External installation
• Natural gas and LPG options
• Condensing technology
• Stainless-steel heat exchanger
• Low-NOx burner technology
• 13:1 modulation
• High flow capability
• Cascade-ready design
• Long-flue capability
• Compact commercial appliance
• Suitable for demanding hot-water applications

Installation Requirements

The N1600e is a professional commercial gas appliance.

Installation should be performed by an appropriately qualified and certified gas/HVAC professional in accordance with:

• Current Rinnai installation instructions
• Local gas regulations
• European requirements
• Applicable national building regulations
• Flue requirements
• Gas-supply requirements
• Condensate-drainage requirements
• Electrical requirements
• Water-pressure requirements
• Manufacturer-specified clearances

Before purchasing, the installer should verify the exact gas type, flow requirement, inlet-water temperature, outlet temperature, pipework, flue arrangement and number of simultaneous outlets.

Gas and Water System Design

Correct system sizing is essential.

A commercial hot-water installation should be designed around:

• Number of outlets
• Peak simultaneous demand
• Required litres per minute
• Desired temperature rise
• Incoming cold-water temperature
• Dynamic water pressure
• Gas availability
• Required operating temperature
• Recirculation requirements
• Building layout

For large projects, a cascade arrangement may be more appropriate than a single water heater.

Frequently Asked Questions

What is the Rinnai N1600e?

The Rinnai N1600e is an externally installed commercial condensing instantaneous gas water heater from the Rinnai N Series. The Rinnai model reference is REU-N3237WC.

How powerful is the Rinnai N1600e?

The N1600 commercial model is rated at approximately 58 kW.

How many litres per minute does the N1600e deliver?

Rinnai states that the N1600 can deliver up to 37 L/min under standard specified conditions. A flow-booster setting can allow higher flow when the required water pressure and temperature conditions are met.

Is the Rinnai N1600e external?

Yes. The N1600e is the external version of the N1600, while the N1600i is the internal model.

Can the Rinnai N1600e use LPG?

Yes, an LPG configuration is available. The exact supplied appliance and conversion requirements should be confirmed before installation.

Can the N1600e run on natural gas?

Yes. A natural-gas configuration is available.

Is the Rinnai N1600e a condensing water heater?

Yes. Rinnai classifies the N1600e as a condensing instantaneous water heater.

Is the N1600e suitable for commercial use?

Yes. Rinnai specifically positions the N Series 1600 as a commercial high-output continuous-flow water-heating solution.

Can multiple Rinnai N1600e units be installed together?

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

Does the Rinnai N1600e have Low-NOx technology?

Yes. The N Series incorporates Low-NOx burner technology, and the current EuroFuelSupply specification lists less than 20 ppm NOx.

Is the Rinnai N1600e suitable for hotels?

It can be suitable for professionally designed hotel hot-water systems where its capacity and configuration meet the calculated demand.

What gas water heater should I use for a large commercial building?

The correct water heater depends on the building’s calculated peak demand, temperature rise, incoming water temperature, gas supply and required flow. For larger projects, multiple N1600e units in cascade may be considered.