KAWMET HARITA S15v S-Box ECO Freestanding Stove
KAWMET HARITA S15v S-Box ECO is a wood-burning freestanding stove from the Polish foundry KAWMET with a nominal output of 5.7 kW, sized for rooms of up to 57 m² (up to 143 m³). A flat front pane shows the firebed head-on. Thermal efficiency is 80.7 %, energy class A+.
The body is made of steel, while the parts under the greatest thermal load — the door, grate and flame guard — are cast iron. This combination heats up faster than an all-cast-iron design while keeping durability where it matters most. A built-in vermiculite baffle raises the combustion temperature and extends the path of the flue gases, and the heat-resistant Robax pane withstands temperatures up to 800 °C.
Key features — HARITA S15v S-Box
- Nominal output 5.7 kW — heats up to 57 m² (143 m³)
- Thermal efficiency 80.7 %, energy class A+
- Secondary combustion — secondary air burns off gases that would otherwise escape up the flue
- Clean glass system — air guided along the pane limits soot build-up
- Air supply adjusted through the ash pan
- Meets Ecodesign requirements
- Provision for an external combustion air supply
- Flue outlet top or rear, flue pipe Ø150 mm; door opens to the left
- Maximum log length 350 mm
- Dimensions (W × H × D): 423 × 1107 × 385 mm, weight 112 kg
- Material: cast iron + steel. Made in Poland — 5-year warranty
The S-Box pedestal — the smaller log store
In the S-Box version there is an open log store beneath the firebox, with an overall height of 1107 mm. The wood stack is within arm's reach and dries further in the stove's heat, so a separate log basket becomes unnecessary. The store is shallower than in the L-Box version — enough for an evening rather than several days.
Vermiculite lining (the “v” designation)
The letter v in the model name denotes a vermiculite lining of the firebox walls. Vermiculite reflects heat back into the firebox instead of storing it, so the chamber reaches a high temperature faster — combustion is cleaner and the pane soots up more slowly. This variant suits people who burn for shorter periods and want a quick effect.
The KAWMET Modern ECO range — a stove built from modules
HARITA S15v S-Box comes from the KAWMET Modern ECO range, in which the same body is combined with one of four bases — Basic, Leg, S-Box or L-Box — and one of two firebox linings. The stove is matched to the interior rather than the other way round.
The body is steel, while the door, grate and flame guard are cast iron. Steel heats up faster than cast iron, so the room warms up soon after lighting; the cast iron parts take over the points under the greatest thermal load. A factory-fitted heat shield allows the stove to stand just 20 cm from the wall.
Is 5.7 kW enough to heat my house?
The model is rated for roughly 57 m² with standard insulation and a ceiling height of 2.5–2.7 m. In a poorly insulated building, one with large glazed areas or a higher ceiling, the real figure will be lower. Oversizing is harmful too, however: for most of the season the appliance then runs on a low flame, which soots up the glass and the flue faster.
Does it need an external air supply?
The model is designed for it, and in an airtight building with mechanical ventilation or heat recovery it is the recommended solution — without its own air supply, ventilation can reverse the flue draught. In an older building with natural ventilation an external air supply is not essential, but it usually makes combustion more stable. The connection parts (inlet, orifice, pipe) are ordered separately — they are not part of the set.
What chimney and space does the stove require?
A flue of Ø150 mm, with the outlet at the top or rear. The stove measures 423 × 1107 × 385 mm (W × H × D) and weighs 112 kg. Required clearances to walls and combustible materials are given in the manufacturer's manual, available in the documents section on this page.
What fuel should be used?
The fuel is seasoned hardwood with a moisture content of up to 20 %. The maximum log length is 350 mm. Wet wood gives noticeably less heat, smokes up the glass and speeds up soot deposits in the flue. Chipboard, painted or impregnated timber and waste must not be burnt — they shorten the life of the cast iron and void the warranty.
KAWMET products carry a 5-year manufacturer's warranty. Your nearest representative will confirm availability and purchase terms.
