Nestor Martin Harmony 23 Wood Burning Stove
The Nestor Martin Harmony 23 Wood Burning Stove blends timeless styling with advanced combustion technology, delivering an efficient and environmentally conscious heating solution for modern homes. As part of the traditionally inspired Harmony range, it combines elegant cast-iron craftsmanship with innovative engineering to provide impressive performance, exceptional flame quality, and reliable day-to-day heating.
Designed exclusively for seasoned wood, the Harmony 23 is an excellent choice for homeowners who appreciate the character of a traditional stove while benefiting from cleaner, more efficient combustion. Its classic styling complements both period properties and contemporary interiors, making it equally suited to a fireplace recess or as a freestanding focal point.
Advanced Combustion Technology
The Harmony range showcases Nestor Martin’s commitment to cleaner, more efficient wood burning. At the heart of the Harmony 23, an integrated catalytic combustion system maximises heat from every log while reducing emissions and improving overall efficiency.
Working alongside Nestor Martin’s ZR Combustion Technology, the catalytic system promotes a cleaner burn with minimal user intervention, producing attractive, natural flame patterns while making better use of seasoned wood.
Plexus Air Control allows you to manage combustion air easily, delivering consistent performance throughout the burn cycle.
Nestor Martin Harmony 23 Wood Burning Stove Efficient Heating for Everyday Living
The Harmony 23 delivers a nominal heat output of 4.6kW, making it well suited to average-sized living rooms and providing comfortable warmth throughout the colder months. Its impressive efficiency rating of 86% converts more of the energy generated into usable heat, improving fuel economy while maintaining a welcoming atmosphere.
The stove comfortably heats areas of up to 96m³ and achieves an A Energy Rating, reflecting its excellent efficiency credentials.
As a DEFRA Smoke Control approved appliance, the Harmony 23 can operate in smoke control areas, making it suitable for homes across many towns and cities throughout the UK.
Thoughtful Design and Installation Flexibility
The Harmony 23 combines traditional aesthetics with practical installation options to suit a variety of homes.
You can choose either a top or rear flue outlet, allowing the stove to match your installation requirements. Selecting the correct flue configuration when ordering ensures compatibility with your intended chimney or flue system.
Nestor Martin includes a rear heat shield as standard, while an optional closed combustion connection allows the stove to connect to an external air supply where required.
Measuring 610mm wide, 659mm high, and 369mm deep, the Harmony 23 offers a generous viewing window without occupying excessive floor space. Its robust 124kg construction reflects the stove’s high-quality build and long-term durability.
If you’re planning a new installation, understanding the wood-burning stove installation process can help you position the appliance correctly for both safety and performance. We also recommend professional stove installation to achieve the best possible results.
Nestor Martin Harmony 23 Wood Burning Stove Clear Flame View and Everyday Convenience
Nestor Martin designed the Harmony 23 to make enjoying a real wood fire as effortless as possible. Double-glazed viewing glass improves efficiency while providing an excellent view of the flames, creating a warm and inviting focal point within the room.
The integrated Air Wash system directs airflow across the inside of the glass to help keep the viewing window cleaner for longer, reducing soot build-up and maintaining a clearer flame picture between cleans.
The stove accommodates logs up to 330mm long, offering practical day-to-day usability for homeowners who regularly burn seasoned wood.
A Traditional Stove with Modern Performance
The Nestor Martin Harmony 23 successfully combines classic styling with some of the brand’s most advanced combustion technologies. Its efficient catalytic system, outstanding efficiency rating, flexible flue options, and thoughtful design features make it an excellent choice for homeowners seeking reliable heating alongside the timeless appeal of a real wood-burning stove.
To find out more about what a professional installation involves, visit our installation process page. For full technical documentation directly from the manufacturer, visit the official Nestor Martin product pages for the Nestor Martin Harmony 23 Wood Burning Stove.
Nestor Martin Harmony 23 Wood Burning Stove — Technical Specifications
Core Specifications
| Specification | Detail |
|---|---|
| Brand | Nestor Martin |
| Series | Harmony |
| Category | Wood Burning Stove |
| Energy Efficiency Class | A |
| Fuel | Wood (Seasoned Wood Only) |
| Combustion Technology | ZR Combustion Technology with Catalyser |
| Air Control | Plexus Air Control |
| Glass | Double Glazed |
| Convection System | Yes |
| Airwash System | Yes |
| Rear Heat Shield | Yes |
| Flue Outlet | Top or Rear |
| Optional Closed Combustion | Yes |
| Smoke Control Approved | Yes |
| Suitable for Glass Floor Plate | Yes |
| Standard | EN 13240 |
| Dimensions | See Dimensional Download Below |
Performance Specifications
| Specification | Value |
|---|---|
| Nominal Heat Output | 4.6 kW |
| Efficiency | 86% |
| CO Emissions (13% O₂) | 0.02% |
| Maximum Log Length | 330 mm |
| Recommended Heat Area | Up to 96 m³ |
Dimensions
| Measurement | Value |
|---|---|
| Height | 659 mm |
| Width | 610 mm |
| Depth | 369 mm |
| Height to Centre of Rear Flue Outlet | 536 mm |
Weight
| Specification | Value |
|---|---|
| Weight | 124 kg |
Installation Clearances
| Specification | Value |
|---|---|
| Distance to Combustible Materials (Rear) | 450 mm |
| Distance to Combustible Materials (Side) | 300 mm |
Downloads
| 7100DC976_1_S_H (003) H33 SE MANUAL 2025.pdf |
| Catalyst Removal and Cleaning.pdf |










Reviews
There are no reviews yet.