Aito
Aitokiuas Heat Storing Wood Burning Sauna/Banya Heater
Aitokiuas Heat Storing Wood Burning Sauna/Banya Heater
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Description
Description
The Aitokiuas is Narvi’s original heat-storing wood-burning sauna heater, its name taken from the Finnish aito kiuas, the genuine stove. A single firing brings the large stone mass to a red glow, and the insulated, black enamelled casing then holds that warmth, giving soft, oxygen-rich löyly for hours; one heating is enough to provide sauna until the following morning. The firebox is built from cast elements and fireproof mass, the stone compartment is lined with firebricks, and the hatch, grate and inner lid are cast iron. It is offered here as the AK-47 for steam rooms of 8–12 m³ and the AK-57 for 9–20 m³, with a through-the-wall (ST) tunnel section for the AK-47 available as an add-on so the heater can be fired from outside the sauna room. The taller AK-57K extension and the AK-57 tunnel section are sold separately, as are the ceramic and olivine sauna stones the heater requires.
Features
Technical Specification
| All models | |
| Safety clearance to sides | 500 mm |
| Safety clearance to front | 1,000 mm |
| Safety clearance to rear | 500 mm |
| Safety clearance above | 1,200 mm |
| AK-47, AK-57 & AK-57K | |
| Connective flue outer diameter | 150 mm |
| Casing | Black enamel-lined steel, insulated |
| AK-47 | |
| Steam room volume | 8–12 m³ |
| Dimensions (H × Dia.) | 1,010 × 470 mm |
| Heater weight (without stones) | 160 kg |
| Stone capacity (ceramic / olivine) | 60 kg / 90 kg |
| Total weight with stones | 220–250 kg |
| Flue connection height from floor | 1,280 mm |
| Flue centre from rear edge | 110 mm |
| Maximum firewood length | 320 mm |
| AK-57 | |
| Steam room volume | 9–20 m³ |
| Dimensions (H × Dia.) | 1,160 × 570 mm |
| Heater weight (without stones) | 240 kg |
| Stone capacity (ceramic / olivine) | 90 kg / 160 kg |
| Total weight with stones | 330–400 kg |
| Flue connection height from floor | 1,460 mm |
| Flue centre from rear edge | 120 mm |
| Maximum firewood length | 410 mm |
| AK-57K (with extension piece, sold separately) | |
| Steam room volume | 11–25 m³ |
| Dimensions (H × Dia.) | 1,380 × 570 mm |
| Heater weight (without stones) | 255 kg |
| Stone capacity (ceramic / olivine) | 140 kg / 190 kg |
| Total weight with stones | 395–475 kg |
| Flue connection height from floor | 1,730 mm |
| Flue centre from rear edge | 120 mm |
| Maximum firewood length | 410 mm |
| AK-78 (not currently sold here) | |
| Steam room volume | 18–40 m³ |
| Dimensions (H × Dia.) | 1,400 × 780 mm |
| Heater weight / stones (ceramic / olivine) | 715 kg / 260 kg / 290 kg |
| Casing | Painted, black |
| Connective flue outer diameter | 210 mm |
| Flue connection height from floor | 1,890 mm |
| AK-110 (not currently sold here) | |
| Steam room volume | 65–80 m³ |
| Dimensions (H × Dia.) | 1,580 × 1,100 mm |
| Heater weight / stones (ceramic / olivine) | 1,775 kg / 600 kg / 650 kg |
| Casing | Painted, black |
| Connective flue outer diameter | 290 mm |
| Flue connection height from floor | 2,040 mm |
Installation
The heater connects to the chimney from the top, with the flue centre set 110–120 mm from the rear edge; the connective flue has a 150 mm outer diameter. A masonry chimney must be at least a half-brick flue with a minimum length of 3 m, while a modular flue must be CE-marked to class T600 with a 150 mm diameter. The heater stands on a stable, fireproof base; the floor surface beneath it can reach 250 °C, so moisture barriers and underfloor heating must not run under the heater. Safety clearances to combustible materials are given above and can be reduced with single or double protective screens as set out in the manual, and at least 1 m should be kept clear in front of the firebox for maintenance. For the AK-57K and larger models a minimum sauna height of 2,700 mm is recommended. Installation must follow the installation manual in the Downloads tab and local building regulations, and we recommend that the heater is fitted by a suitably qualified installer.
Sauna stones
The Aitokiuas is designed for durable ceramic and olivine sauna stones, which withstand the high temperatures of a heat-storing stove; depending on model it takes 60–190 kg. Stones are sold separately, and the recommended quantities for each model are given in the installation manual.
Brand
Aito heaters are made by Narvi Oy, a Finnish manufacturer of wood-burning sauna heaters. All Aito heat-storing heaters are CE tested and carry the Finnish Key Flag, awarded to products designed and made in Finland.
Warranty
The warranty card is available in the Downloads tab.
Delivery & Returns
Delivery
We offer fast and reliable delivery to customers across the UK and beyond. For full details on shipping times and costs, please review our delivery policy.
Returns
We offer hassle-free returns within 30 days of purchase, so you can shop with complete confidence. For details, see our returns policy.
Warranty & Quality Promise
We are committed to delivering products of the highest quality, for details surrounding warranty please contact us.
Description
The Aitokiuas is Narvi’s original heat-storing wood-burning sauna heater, its name taken from the Finnish aito kiuas, the genuine stove. A single firing brings the large stone mass to a red glow, and the insulated, black enamelled casing then holds that warmth, giving soft, oxygen-rich löyly for hours; one heating is enough to provide sauna until the following morning. The firebox is built from cast elements and fireproof mass, the stone compartment is lined with firebricks, and the hatch, grate and inner lid are cast iron. It is offered here as the AK-47 for steam rooms of 8–12 m³ and the AK-57 for 9–20 m³, with a through-the-wall (ST) tunnel section for the AK-47 available as an add-on so the heater can be fired from outside the sauna room. The taller AK-57K extension and the AK-57 tunnel section are sold separately, as are the ceramic and olivine sauna stones the heater requires.
Features
| All models | |
| Safety clearance to sides | 500 mm |
| Safety clearance to front | 1,000 mm |
| Safety clearance to rear | 500 mm |
| Safety clearance above | 1,200 mm |
| AK-47, AK-57 & AK-57K | |
| Connective flue outer diameter | 150 mm |
| Casing | Black enamel-lined steel, insulated |
| AK-47 | |
| Steam room volume | 8–12 m³ |
| Dimensions (H × Dia.) | 1,010 × 470 mm |
| Heater weight (without stones) | 160 kg |
| Stone capacity (ceramic / olivine) | 60 kg / 90 kg |
| Total weight with stones | 220–250 kg |
| Flue connection height from floor | 1,280 mm |
| Flue centre from rear edge | 110 mm |
| Maximum firewood length | 320 mm |
| AK-57 | |
| Steam room volume | 9–20 m³ |
| Dimensions (H × Dia.) | 1,160 × 570 mm |
| Heater weight (without stones) | 240 kg |
| Stone capacity (ceramic / olivine) | 90 kg / 160 kg |
| Total weight with stones | 330–400 kg |
| Flue connection height from floor | 1,460 mm |
| Flue centre from rear edge | 120 mm |
| Maximum firewood length | 410 mm |
| AK-57K (with extension piece, sold separately) | |
| Steam room volume | 11–25 m³ |
| Dimensions (H × Dia.) | 1,380 × 570 mm |
| Heater weight (without stones) | 255 kg |
| Stone capacity (ceramic / olivine) | 140 kg / 190 kg |
| Total weight with stones | 395–475 kg |
| Flue connection height from floor | 1,730 mm |
| Flue centre from rear edge | 120 mm |
| Maximum firewood length | 410 mm |
| AK-78 (not currently sold here) | |
| Steam room volume | 18–40 m³ |
| Dimensions (H × Dia.) | 1,400 × 780 mm |
| Heater weight / stones (ceramic / olivine) | 715 kg / 260 kg / 290 kg |
| Casing | Painted, black |
| Connective flue outer diameter | 210 mm |
| Flue connection height from floor | 1,890 mm |
| AK-110 (not currently sold here) | |
| Steam room volume | 65–80 m³ |
| Dimensions (H × Dia.) | 1,580 × 1,100 mm |
| Heater weight / stones (ceramic / olivine) | 1,775 kg / 600 kg / 650 kg |
| Casing | Painted, black |
| Connective flue outer diameter | 290 mm |
| Flue connection height from floor | 2,040 mm |
Installation
The heater connects to the chimney from the top, with the flue centre set 110–120 mm from the rear edge; the connective flue has a 150 mm outer diameter. A masonry chimney must be at least a half-brick flue with a minimum length of 3 m, while a modular flue must be CE-marked to class T600 with a 150 mm diameter. The heater stands on a stable, fireproof base; the floor surface beneath it can reach 250 °C, so moisture barriers and underfloor heating must not run under the heater. Safety clearances to combustible materials are given above and can be reduced with single or double protective screens as set out in the manual, and at least 1 m should be kept clear in front of the firebox for maintenance. For the AK-57K and larger models a minimum sauna height of 2,700 mm is recommended. Installation must follow the installation manual in the Downloads tab and local building regulations, and we recommend that the heater is fitted by a suitably qualified installer.
Sauna stones
The Aitokiuas is designed for durable ceramic and olivine sauna stones, which withstand the high temperatures of a heat-storing stove; depending on model it takes 60–190 kg. Stones are sold separately, and the recommended quantities for each model are given in the installation manual.
Brand
Aito heaters are made by Narvi Oy, a Finnish manufacturer of wood-burning sauna heaters. All Aito heat-storing heaters are CE tested and carry the Finnish Key Flag, awarded to products designed and made in Finland.
Warranty
The warranty card is available in the Downloads tab.
Delivery
We offer fast and reliable delivery to customers across the UK and beyond. For full details on shipping times and costs, please review our delivery policy.
Returns
We offer hassle-free returns within 30 days of purchase, so you can shop with complete confidence. For details, see our returns policy.
Warranty & Quality Promise
We are committed to delivering products of the highest quality, for details surrounding warranty please contact us.
