At the back is a counterbalanced lift door, which can also be opened on hinges to the side. Redesigned firebox with ceramic firebox liners. The entire heat exchanger is powder-coated to ensure a long life. Replacement air can be brought from the outside under the fireplace, where there is a ready 100 mm connection stub. Secondary air is directed from above the fireplace glass door, keeping the door clean for as long as possible. Replacement air is preheated cooled in the fireplace's side channel before being fed into the firebox (see the last picture). Tertiary air is also guided into the fireplace through the cast iron back element of the firebox, whereby the air fed into the firebox afterburner air is already hot, which improves the combustion technology even further. Beneath the cast-iron grates is an ash pan with a lifting handle. The hollow stainless steel handle does not get hot during use. When the firebox is correctly loaded to the top with wood and lit from the top, a single load can produce up to 40 kWh of energy! The large glass door provides plenty of atmosphere from the fire. A 1,000 l thermal accumulator is recommended as the storage tank size. The fireplace is pre-insulated.