Metters Kosi 35

Metters Kosi 35. The Kosi 35 is a large-capacity freestanding wood heater designed to heat expansive, open-plan living areas while delivering long burn times and low emissions.

Kosi 35 — Overview

The Kosi 35 pairs a roomy firebox with thoughtful features that make wood heating practical and reliable. If you need steady heat for large spaces, the Kosi 35 offers performance, a no-mess ash box and robust construction backed by a long firebox warranty.

Kosi 35 — Specifications at a glance

• Overall dimensions: 694W x 534D x 864H (mm)
• Weight: 156 kg
• Heating area: up to 350 m²
• Average output: 7.8 kW
• Firebox capacity: 73 L
• Firebox dimensions: 540W x 325D x 374H (mm)
• Firebox thickness: 6 mm steel
• Maximum log length: 520 mm
• Emissions: 0.7 g/kg
• Efficiency: 68%
• Warranty: 15 year firebox warranty

Kosi 35 — Key features

• Generous firebox for longer burn times and fewer reloads.
• No-mess ash box for easier cleaning and maintenance.
• Solid 6 mm steel firebox construction for longevity.
• Low particulate emissions and high efficiency for a cleaner burn.
• Designed to heat very large open-plan homes up to 350 m².

Dimensions & portability

With overall dimensions of 694W x 534D x 864H mm and a mass of 156 kg, the this product is a substantial freestanding heater. Its size and weight make it suitable as a fixed, prominent heating appliance rather than a portable unit.

Fuel & setup

The this product is designed for seasoned hardwood and accepts logs up to 520 mm. For safe and efficient operation, follow local installation regulations and the Kosi Range owners manual for clearances and flue requirements; professional installation is recommended.

What's included

• this product freestanding wood heater
• No-mess ash collection system integrated
• 15 year firebox warranty (manufacturer firebox warranty)

Who it's for

The this product suits homeowners with large, open-plan living areas who want a traditional wood fire experience with modern combustion performance. If you need reliable heat for communal spaces and want fewer reloads thanks to a large firebox, the this product is a strong choice.

Care & maintenance

• Empty the ash box regularly to maintain airflow and efficiency.
• Use dry, well-seasoned hardwood for best heat output and low emissions.
• Inspect and service flue components annually; remove creosote build-up as required.
• Check door seals and firebricks periodically and replace as needed to protect the firebox warranty.

Choosing the right option

If you're comparing options in this range, focus on how it will fit your space, how often you’ll use it, and what matters most day-to-day. For many households, the best choice is the one that’s easy to live with — straightforward to use, simple to keep looking good, and suited to Australian conditions. When you’re weighing up your shortlist, consider your layout, traffic flow, and whether you want something that’s more entertaining-focused or more everyday practical. If you’d like a second opinion, our team can help you narrow it down based on your space, style and how you plan to use it. A quick way to decide is to ask: does “this product” describe what you’re actually trying to achieve in your outdoor area? Once you’re clear on the goal, this product becomes much easier to compare across different options and configurations. Check our entire heating range at Alfresco Outdoors and Heating

Delivery Area

Delivery is currently available to selected postcodes only.

Please check that your delivery address is within our eligible postcode delivery area before placing your order.

If your postcode is not listed, please get in touch with our team before ordering and we’ll be happy to discuss whether delivery may be available to your area.

Please note: Delivery availability is subject to the postcodes listed on our Shipping page.