A powerful cast iron multi-fuel stove combining timeless design with modern Ecodesign performance.

The Nestor Martin Harmony III Ecodesign stove is a substantial and beautifully crafted multi-fuel stove, designed to deliver impressive warmth, long-lasting durability, and excellent control. Built entirely from premium cast iron, it offers a traditional look with the performance expected from a modern, efficient stove.

With a generous 12kW nominal heat output, the Harmony III is ideal for larger rooms, open-plan living areas, and homes that need serious heating performance. Suitable for burning seasoned wood or approved smokeless fuel, it provides flexibility, reliability, and a striking focal point for your home.

Traditional Cast Iron Craftsmanship

The Harmony III is made from high-quality cast iron, giving it excellent strength, heat retention, and classic character. Its timeless design suits a wide range of interiors, from period properties and country homes to more traditional living spaces.

The solid construction is designed for years of dependable use, while the large proportions and flame view create a welcoming fireside atmosphere.

Powerful Multi-Fuel Heating

Designed for both wood and smokeless fuel, the Harmony III gives you the freedom to choose the fuel type that best suits your home and heating needs.

Its 12kW nominal output provides strong, consistent heat, while the 76% efficiency and A energy rating help make effective use of fuel.

Precise Control with Thermostatic Damper

The Harmony III features a thermostatic damper, giving you greater control over the stove’s heat output and combustion. Combined with airwash control and adjustable air levers, this allows you to fine-tune the burn for comfort, efficiency, and fuel type.

Whether you are building a strong fire on a cold evening or maintaining a steady background warmth, the Harmony III is designed to respond to your needs.

Easier Lighting and Cleaner Burning

A direct draught slide helps warm the flue quickly, making it easier to establish the fire from cold. This supports a cleaner start-up and helps the stove reach efficient operating conditions more quickly.

The airwash system helps keep the glass clearer by directing air across the viewing window, allowing you to enjoy the flame picture with less build-up.

Practical Side-Loading Door

The Harmony III includes a side-loading door, making it easier to load longer logs of up to 500mm. This practical feature reduces the need for frequent refuelling and helps minimise ash and debris dropping onto the hearth.

Ecodesign Compliant

The Harmony III is Ecodesign compliant, meeting the emissions and efficiency standards introduced in the UK in 2022. This means it has been designed to burn more cleanly and efficiently, helping reduce environmental impact while still delivering excellent heat output.

Key Features

• 12kW nominal heat output
• Suitable for wood and approved smokeless fuel
• Ecodesign compliant
• A energy rating
• 76% efficiency
• Premium cast iron construction
• Traditional design with modern performance
• Thermostatic damper for controlled heat output
• Airwash system to help keep the glass clear
• Adjustable air controls
• Direct draught slide for easier lighting
• Side-loading door for longer logs
• Maximum log length of 500mm
• Suitable for heating areas up to 420m³

Technical Specifications

The Nestor Martin Harmony III Ecodesign Stove is a powerful, traditional cast iron multi-fuel stove with the control, efficiency, and cleaner-burning performance required for modern homes. It is an excellent choice for larger spaces where strong heat output, classic styling, and everyday practicality are equally important.