Solid wood back Leaf Sauna | M3 Black 16.5kW Wood Fired Heater

The Harvia M3 Black is a wood-fired sauna heater built on classical lines. Graphite black with a stainless steel air-flow spoiler, it's designed to heat small to medium saunas up to 13 cubic metres, delivering 16.5kW of even warmth. A glass door lets you watch the fire's glow without sacrificing heat efficiency, creating the heart of a proper sauna room.

Wood burning transforms the ritual. There's a particular quality to flame-heated saunas: the smell of the wood, the gentle crackle, the sense that you're part of something older than modern plumbing and electricity. The M3 delivers that. Air circulation is managed carefully to ensure even temperature throughout the space, so you're not chasing hot spots.

This is a heater for committed sauna users. Installation requires proper flue work and ventilation, but once it's set up, you have a focal point that works year after year. The engineering is Finnish, which matters.