{"product_id":"naturzugkessel-defro-firewood-plus-24-kw","title":"Natural Draft Boiler Defro Firewood Plus 24 kW","description":"\u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eProduct Overview \u0026 Application\u003c\/h2\u003e \u003cp\u003eThe Defro Firewood Plus 24 kW is a hand-fed natural draft boiler for split logs, designed for use as a central heat source in hot water heating systems. With a nominal output of 24 kW, the boiler is suitable for heating systems where a log boiler with a buffer tank is professionally integrated into a closed heating system.\u003c\/p\u003e \u003cp\u003eThe boiler is designed for operation with natural split logs and combines a robust boiler construction with controlled combustion air supply. The specific output selection should always be based on the actual heat demand of the building.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eTechnology \u0026 Equipment\u003c\/h2\u003e \u003cp\u003eThe Firewood Plus 24 operates as a natural draft boiler with a hand-fed firebox, cast iron grate, steel insert in the combustion chamber, and multi-pass flue gas routing. Heat transfer occurs via a steel heat exchanger with vertical and horizontal convection channels.\u003c\/p\u003e \u003cp\u003ePrimary air is supplied through the air flap in the ash door and regulated by the electronic draft controller. Secondary air enters the combustion zone through side air inlets. The equipment includes, among other things, an analog boiler thermometer, turbulators, a safety heat exchanger, and cleaning tools.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eEveryday Benefits\u003c\/h2\u003e \u003cp\u003eThe separate arrangement of the loading door, ignition door, and ash door facilitates access to the combustion chamber, ash pan, and heat exchanger area. For cleaning and maintenance, the relevant boiler areas are accessible so that routine care tasks can be performed systematically.\u003c\/p\u003e \u003cp\u003eInspection windows on the boiler sides allow flame observation without unnecessarily opening the door. The thermal insulation of the boiler body reduces heat losses from the boiler surface and supports quiet system operation in the boiler room.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eSystem Integration \u0026 Compatibility\u003c\/h2\u003e \u003cp\u003eThe natural draft boiler is intended for closed hot water heating systems and must be operated with a suitable buffer tank. For safe and stable system operation, return temperature boosting, chimney connection, safety devices, and hydraulic integration must be coordinated with the overall system.\u003c\/p\u003e \u003cp\u003ePlanning and installation should be carried out by a qualified specialist company. Before installation, the flue gas system must be coordinated with the responsible chimney sweep, particularly regarding chimney draft, flue pipe routing, and cross-section.\u003c\/p\u003e \u003c\/div\u003e \u003cstyle\u003e .product-th{margin-top:2rem}.product-th h2{margin:0 0 1rem}.product-th__table{width:100%;border-collapse:separate;border-spacing:0}.product-th__table td{padding:.95rem 1rem;vertical-align:top}.product-th__label{font-weight:700;width:38%;color:#213670}.product-th__value{color:#1f2937}.product-th__table tr:nth-child(odd) td{background:#f4f7fb}.product-th__table tr:nth-child(even) td{background:#fafbfd} \u003c\/style\u003e \u003cdiv class=\"product-th\"\u003e \u003ch2\u003eTechnical Specifications at a Glance\u003c\/h2\u003e \u003cp\u003eThe following values summarize the key technical data of the Defro Firewood Plus 24 kW.\u003c\/p\u003e \u003ctable class=\"product-th__table\"\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eNominal Output\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e24 kW\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eFuel\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eSplit logs, preferably birch, residual moisture 12–20%\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eCombustion Technology\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eNatural draft\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eEfficiency at Nominal Output\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e92.3%\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eEnergy Efficiency Class\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eA+\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMax. Flow Temperature\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e90 °C\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eMax. Operating Pressure\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e3.0 bar\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eLog Length\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003emax. 400 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eBoiler Class\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eClass 5 per EN 303-5:2012\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eDraft Requirement\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e20 Pa\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eFlue Gas Temperature at Nominal Output\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e154 °C\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eFlue Pipe Connection\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eØ 178 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eSafety Heat Exchanger\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eYes\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eBuffer Tank Recommended\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eYes, min. 55 liters per kW\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eConnection Size\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eFlow and return female thread 1 ½ inch\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eHeight\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e1460 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eWidth\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e655 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eDepth\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e1035 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eWeight\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eapprox. 429 kg\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eVoltage\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e230 V\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eFrequency\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e50 Hz\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003ePower Consumption\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003emax. 5 W\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eInstallation\u003c\/h2\u003e \u003cp\u003eThe boiler must be installed in accordance with applicable regulations and manufacturer specifications. The boiler must be placed on a suitable, load-bearing, and non-combustible base and positioned to allow easy operation, cleaning, and maintenance.\u003c\/p\u003e \u003cp\u003eFor operation, a professionally dimensioned chimney, suitable return temperature boosting, and a buffer tank are required. The electrical connection of the draft controller must be carried out by an electrician or appropriately qualified personnel.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eNotes\u003c\/h2\u003e \u003cp\u003eThe boiler may only be operated with the fuels specified in the manufacturer's documentation. For operation with split logs, attention must be paid to suitable wood quality, appropriate residual moisture, and correct log length.\u003c\/p\u003e \u003cp\u003eThe output specification serves for technical classification and does not replace a heat load calculation. Maintenance, cleaning, water quality, return temperature, and chimney draft affect the operational safety and service life of the entire heating system.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eScope of Delivery\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eDefro Firewood Plus 24 kW natural draft boiler\u003c\/li\u003e \u003cli\u003eBoiler operating manual\u003c\/li\u003e \u003cli\u003eElectronic draft controller\u003c\/li\u003e \u003cli\u003eAnalog boiler thermometer\u003c\/li\u003e \u003cli\u003eSteel insert for the combustion chamber\u003c\/li\u003e \u003cli\u003ePrimary air flap\u003c\/li\u003e \u003cli\u003eCleaning tools\u003c\/li\u003e \u003cli\u003eCast iron grate\u003c\/li\u003e \u003cli\u003eTurbulators\u003c\/li\u003e \u003cli\u003eSafety heat exchanger\u003c\/li\u003e \u003c\/ul\u003e \u003c\/div\u003e","brand":"Defro","offers":[{"title":"Default Title","offer_id":49417986146652,"sku":"DFW24","price":3156.26,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/7796\/6428\/files\/defro-firewood-plus-24-kw-naturzugkessel-kompakt-effizient-robust-5704745.webp?v=1770692600","url":"https:\/\/fi.gemashop.de\/en\/products\/naturzugkessel-defro-firewood-plus-24-kw","provider":"GEMA Shop","version":"1.0","type":"link"}