Rinnai 17i 36 kW Low-NOx Natural Gas Water Heater with Flue

Rinnai 17i Natural Gas water heater

The Rinnai 17i 36 kW Low-NOx Natural Gas Water Heater is an internal, room-sealed instantaneous gas water heater designed to provide continuous hot water on demand.

The Rinnai 17i combines Low-NOx combustion technology, direct electronic ignition, electronic temperature control and a compact wall-mounted design. It is suitable for domestic and selected light-commercial applications where an instantaneous natural gas water-heating solution is required.

Rinnai’s current specification lists the 17i with 32.4/36.0 kW natural-gas input and approximately 28.4 kW output at nominal operation. Maximum flow is specified at approximately 16.3 L/min at a 25°C temperature rise.

Key Features of the Rinnai 17i

17 L-Class Continuous-Flow Hot Water

The Rinnai 17i is designed to heat water as it is required rather than relying on a conventional storage cylinder.

Rinnai specifies a maximum flow of approximately 16.3 L/min at a 25°C temperature rise, with the actual delivered flow depending on incoming water temperature, water pressure, selected outlet temperature and installation conditions.

This makes the Rinnai 17i particularly relevant to customers searching for a 17 L/min natural gas instantaneous water heater.

Natural Gas Operation

This product is configured for Natural Gas.

Rinnai’s technical documentation identifies the 17i as available in Natural Gas and LPG configurations, with the relevant product codes including W17i-NAT and W17i-LPG.

36 kW-Class Gas Input

The Rinnai 17i is commonly described as a 36 kW-class water heater.

For technical accuracy, Rinnai’s current specification gives the Natural Gas nominal input as 32.4 kW net / 36.0 kW gross, with approximately 28.4 kW output.

Low-NOx Technology

The Rinnai 17i is part of Rinnai’s Low-NOx instantaneous water-heater range.

Rinnai describes the 17i as an Ultra Low-NOx appliance designed to meet applicable Ecodesign requirements.

Internal Room-Sealed Installation

The Rinnai 17i is designed for internal wall-mounted installation.

Its room-sealed forced-flue arrangement separates the combustion process from the room environment and uses a dedicated flue system for combustion air and exhaust gases.

Direct Electronic Ignition

The appliance uses direct electronic ignition, providing electronically controlled ignition without a continuously burning pilot light.

Compact Wall-Mounted Design

Rinnai lists the 17i at approximately 541 mm high × 373 mm wide × 173 mm deep, making it a compact option where installation space is limited.

Rinnai 17i Technical Specifications

Technical values are based on Rinnai’s current and recent 17i technical documentation. Always verify the exact flue arrangement and installation limits against the supplied product documentation.

Flue System

The Rinnai 17i uses a forced room-sealed flue system.

Rinnai’s published technical information specifies an 80/125 mm flue size for the 17i and provides installation limitations for the applicable flue configuration.

If this EuroFuelSupply product is sold with a flue kit, the exact components included in the package should be listed clearly in the WooCommerce specifications.

Do not substitute non-approved flue components.

Applications

The Rinnai 17i can be considered for suitable applications including:

• Domestic properties
• Houses
• Apartments
• Kitchens
• Bathrooms
• Guest accommodation
• Small retail premises
• Glamping accommodation
• Modular buildings
• Agricultural buildings
• Temporary hot-water installations
• Event and hire applications
• Selected light-commercial premises

Rinnai specifically lists domestic properties, glamping pods, modular buildings, agricultural sites, small retail outlets, festival/event ablutions and hire applications among potential 17i applications.

Why Choose the Rinnai 17i Natural Gas Water Heater?

The Rinnai 17i combines compact installation with instantaneous natural-gas water heating.

Key features include:

• 36.0 kW gross natural-gas input
• Approximately 28.4 kW nominal output
• Up to 16.3 L/min at a 25°C temperature rise
• Low-NOx combustion
• Internal wall-mounted installation
• Room-sealed operation
• Direct electronic ignition
• Electronic temperature control
• 37–65°C temperature range
• Compact 173 mm depth
• 80/125 mm flue system
• Built-in frost protection

Rinnai also describes the 17i as suitable for applications requiring intermittent hot-water demand, including domestic and selected commercial environments.

Continuous-Flow Hot Water

The Rinnai 17i is an instantaneous or continuous-flow water heater.

Instead of heating and storing a large volume of water in a traditional cylinder, the appliance heats water as it passes through the unit.

This configuration can be useful where customers require hot water on demand and want to minimise the space occupied by a separate storage cylinder.

Temperature Control

The Rinnai 17i uses electronic temperature control and is designed to maintain controlled hot-water delivery.

Rinnai specifies a temperature range of approximately 37°C to 65°C, with the exact available settings determined by the appliance configuration.

Frost Protection

Rinnai lists built-in frost protection among the 17i’s features.

Because the 17i is an internal appliance, installation should nevertheless follow the manufacturer’s requirements for pipework, location and protection from freezing conditions.

Installation Requirements

The Rinnai 17i is a gas appliance and must be installed and commissioned by a suitably qualified professional.

Before installation, the installer should verify:

• Natural gas supply
• Gas pressure
• Water pressure
• Water flow
• Appliance clearances
• Flue route
• Flue terminal position
• Flue length and bends
• Combustion requirements
• Electrical supply
• Local gas regulations
• National installation standards
• Appliance commissioning requirements

The flue system must be installed using the correct Rinnai-approved configuration.

Do not attempt to install, modify or commission the appliance or gas/flue system yourself.

Rinnai 17i for European Customers

The Rinnai 17i is relevant to European customers searching for a Low-NOx natural gas instantaneous water heater for domestic and selected light-commercial applications.

Gas categories, installation standards, flue requirements and regulatory requirements can vary between European countries. Customers should therefore confirm that the specific product configuration is suitable for the intended country and installation before ordering.

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

Frequently Asked Questions

What is the Rinnai 17i?

The Rinnai 17i is an internal, room-sealed instantaneous natural gas water heater designed to provide hot water on demand.

Is the Rinnai 17i a tankless water heater?

Yes. It is an instantaneous or continuous-flow gas water heater that heats water as required rather than storing a large volume in a conventional tank.

What is the gas input of the Rinnai 17i?

Rinnai specifies 32.4 kW net / 36.0 kW gross Natural Gas input at nominal operation. The approximate nominal output is 28.4 kW.

How much hot water does the Rinnai 17i deliver?

The maximum published flow is approximately 16.3 L/min at a 25°C temperature rise. At higher temperature rises, the available flow decreases. Rinnai lists approximately 13.6 L/min at ΔT 30°C and 11.6 L/min at ΔT 35°C.

Is the Rinnai 17i a natural gas water heater?

Yes. The Natural Gas version is identified as W17i-NAT in Rinnai’s technical documentation.

Is the Rinnai 17i Low-NOx?

Yes. Rinnai identifies the 17i as an Ultra Low-NOx water heater.

Is the Rinnai 17i installed indoors?

Yes. Rinnai specifies the 17i as an internal wall-mounted water heater with a forced room-sealed flue system.

What flue does the Rinnai 17i use?

Rinnai’s technical documentation specifies an 80/125 mm forced room-sealed flue system for the 17i. The allowable flue arrangement and maximum run must be checked against the exact installation configuration.

What are the dimensions of the Rinnai 17i?

The appliance is approximately 541 mm high × 373 mm wide × 173 mm deep.

Who should install the Rinnai 17i?

The appliance should be installed and commissioned by an appropriately qualified gas/heating professional in accordance with the manufacturer’s instructions and applicable local regulations.

Buy Rinnai 17i Natural Gas Water Heater in Europe

Looking to buy a Rinnai 17i Low-NOx natural gas water heater with flue?

EuroFuelSupply supplies heating and hot-water equipment to residential customers, installers, contractors and commercial buyers across Europe.

For availability, delivery information, technical questions or larger orders, contact EuroFuelSupply before purchasing.

Product: Rinnai 17i
Fuel: Natural Gas
Type: Internal instantaneous gas water heater
Nominal gross input: 36.0 kW
Approx. output: 28.4 kW
Maximum flow: 16.3 L/min at ΔT 25°C
Installation: Internal wall mounted
Flue: Forced room-sealed 80/125 mm system
Technology: Low-NOx
Brand: Rinnai