Stûv S6 Insert

A compact modern wood insert designed to upgrade an existing masonry fireplace – the Stûv 6-in is built for homeowners who want to turn an older open fireplace into something cleaner, more efficient, and far more useful without losing the charm of a real wood fire. Stûv positions the 6-in family as a solution for small spaces and masonry hearths, with a compact overall footprint and a generous flame view.
Built to keep the fire front and center – one of the biggest strengths of the Stûv 6-in is that it manages to feel sleek and minimal while still offering a strong visual connection to the flames. Stûv also uses a factory-configured air intake system designed to automatically calibrate combustion air, which helps simplify operation compared with inserts that require more manual damper fiddling.
A major advantage is how easily it fits where an old fireplace used to fall short – instead of leaving a masonry hearth as a drafty decorative feature, the Stûv 6-in gives that space a real working purpose again. It is a strong fit for customers who want a cleaner look, better efficiency, and a more environmentally responsible way to enjoy wood heat in an existing fireplace opening.

Starting at $5759.00

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The Stûv 6-in is built for homeowners who want to get more out of an existing masonry fireplace. This is a clean, modern upgrade for spaces where an old open hearth may have looked good, but did very little in terms of efficiency, control, or real heating performance. Instead of abandoning that fireplace altogether, the 6-in gives it a new job — and does it with a lot more style than many traditional inserts.

What makes the Stûv 6-in stand out is its balance of compact size and strong fire view. Stûv designed this insert family to fit smaller hearth openings while still keeping the flames as the focus. That makes it especially appealing in renovations, older homes, or projects where the customer wants a wood insert that feels refined and intentional instead of bulky and forced into the opening.

Another major strength is its simple, controlled operation. The Stûv 6-in uses calibrated combustion air and is designed to produce little ash while being easy to light, which fits nicely for buyers who want the experience of wood heat without a lot of unnecessary complication. Across the lineup, Stûv offers three sizes — 66×50, 76×55, and 76×60 — giving some flexibility depending on the size of the existing fireplace and the heating goals of the space.

For homeowners who want a premium wood insert that feels modern, efficient, and purpose-built for an existing masonry hearth, the Stûv 6-in lands in a very strong spot. It keeps the soul of a real wood fire, but turns an underperforming fireplace into something far more practical and enjoyable.

Technical Specifications

Appliance Type: Contemporary wood insert for existing masonry hearths.
Available Sizes: 66×50, 76×55, 76×60.
Maximum Log Length: 16″ / 20″ / 20″ depending on size.
EPA Efficiency: 68.4% / 67.6% / 68.3% depending on size.
Particulate Emissions: 1.93 / 1.86 / 1.89 g/h depending on size.
Maximum Heat Output: 49,000 / 58,000 / 64,000 BTU/h depending on size.
Firebox Size: 1.08 ft³ / 1.58 ft³ depending on model family grouping in the technical sheet.
Weight: 165 lb / 200 lb depending on size grouping.
Glass Size: 20 9/16″ x 12 1/16″ or 24 1/2″ x 16″ depending on size grouping.
Outside Air: 4″ duct.
Flue Diameter: 6″–7″.