Rinnai Zen 24kW Natural Gas Combi Boiler

Rinnai Zen 24kW Natural Gas Combi Boiler

Rinnai Zen 24kW combi boiler

The Rinnai Zen 24kW is a compact wall-mounted gas condensing combination boiler designed to provide central heating and domestic hot water from a single appliance. Its flexible design allows indoor or outdoor installation, making it suitable for homes and properties where installation space or boiler location is an important consideration.

The ZEN 24 combines condensing technology with integrated smart controls, a stainless steel heat exchanger, low-NOx burner technology and instantaneous domestic hot water production. Rinnai specifications identify the ZEN 24 as a 24kW nominal model with an A-rated heating efficiency class.

24kW Condensing Boiler

The Rinnai Zen 24 has a nominal thermal input of 24.0kW for both heating and domestic hot water. Its heating modulation range is approximately 5.3–23.3kW at 80/60°C, while the domestic hot water modulation range is approximately 5.4–23.5kW.

This makes the ZEN 24 a practical option for smaller to medium-sized properties requiring a compact boiler with both heating and instantaneous hot water capability.

Instantaneous Domestic Hot Water

The Rinnai Zen 24 heats domestic hot water directly rather than storing it in a separate cylinder. At a 35°C temperature rise, the ZEN 24 provides approximately 9.6 litres per minute of domestic hot water. At a 25°C temperature rise, the delivery rate is approximately 13.5 litres per minute.

The boiler’s domestic hot water temperature range is approximately 35°C to 60°C, providing flexibility for different household hot water requirements.

A-Rated Heating Efficiency

The Rinnai Zen 24 is designed as a high-efficiency condensing boiler and carries an A energy efficiency rating for heating. Rinnai technical documentation lists efficiency of approximately 97.5% at 80/60°C and 107.4% at 50/30°C based on the applicable calculation methodology.

The condensing design allows the boiler to recover additional heat from the flue gases, helping improve efficiency when operated at suitable return-water temperatures.

Indoor or Outdoor Installation

One of the main advantages of the Rinnai Zen 24 is its installation flexibility. The appliance is designed for both indoor and outdoor installation and has an IPX5D protection rating. Rinnai documentation also specifies built-in frost protection down to approximately -20°C for the applicable configuration.

This makes the ZEN 24 particularly useful where an external boiler installation is preferred or where internal space is limited.

Compact Wall-Mounted Design

The ZEN 24 has a compact wall-mounted format measuring approximately:

• Height: 660mm
• Width: 440mm
• Depth: 285mm
• Weight: approximately 33kg

Its compact dimensions make it suitable for domestic installations where available wall space is limited.

Wi-Fi Controls and My Rinnai App

The Rinnai Zen 24 is supplied with a Wi-Fi chronothermostat and My Rinnai app functionality on the relevant European configuration. The system allows users to adjust heating settings, program operation and monitor energy consumption through compatible smart controls.

The controls also support daily and weekly programming, helping users manage heating schedules around their routines.

Stainless Steel Heat Exchanger

The Zen range uses a stainless steel primary heat exchanger, designed to provide efficient heat transfer and durability. Rinnai’s documentation also identifies an integrated condensate neutraliser and an integrated external weather sensor on the applicable ZEN configuration.

Low-NOx Condensing Technology

The Rinnai Zen uses a metal-fibre burner and is specified as a Class 6 NOx appliance in current European technical documentation. This supports lower nitrogen oxide emissions compared with older-generation gas heating appliances.

Natural Gas and LPG Options

The ZEN 24 range is available in configurations for natural gas and LPG/propane, depending on the exact model and market. For this product page, the listed configuration is the natural gas ZEN 24. Rinnai documentation identifies the natural-gas model as REB-KBI2424FF-NG, with a separate LPG version available.

Always verify the exact gas configuration and local installation requirements before ordering.

Rinnai Zen 24 Technical Specifications

Specifications can vary by market and exact model configuration, so the manufacturer’s documentation should be checked before installation or purchase.

Frequently Asked Questions

What is the Rinnai Zen 24?

The Rinnai Zen 24 is a 24kW wall-mounted gas condensing combi boiler designed to provide central heating and instantaneous domestic hot water from one compact appliance.

Is the Rinnai Zen 24 a condensing boiler?

Yes. The ZEN 24 is a gas-fired condensing boiler designed for high-efficiency heating and hot water production.

What is the hot water flow rate of the Rinnai Zen 24?

The ZEN 24 provides approximately 9.6 L/min at a 35°C temperature rise and approximately 13.5 L/min at a 25°C temperature rise.

Can the Rinnai Zen 24 be installed outdoors?

Yes. The ZEN 24 is designed for indoor or outdoor installation and has IPX5D protection.

Does the Rinnai Zen 24 require a hot water cylinder?

No. It is a combi boiler with instantaneous domestic hot water production, so a separate storage cylinder is not normally required.

Does the Rinnai Zen 24 have Wi-Fi?

Yes. The applicable ZEN 24 configuration includes a Wi-Fi chronothermostat and My Rinnai app functionality for remote heating control and programming.

What are the dimensions of the Rinnai Zen 24?

The ZEN 24 measures approximately 660mm high × 440mm wide × 285mm deep and weighs approximately 33kg.

Is the Rinnai Zen 24 A-rated?

Yes. Rinnai technical documentation lists the ZEN 24 with A-rated heating efficiency.

Can I buy the Rinnai Zen 24 from EuroFuelSupply?

EuroFuelSupply supplies boilers and heating equipment to residential, trade, commercial and wholesale customers across European markets. Customers can request pricing based on product, quantity and delivery destination.