{"product_id":"naturzugkessel-defro-firewood-plus-15-kw","title":"Natural Draft Boiler Defro Firewood Plus 15 kW","description":"\u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eProduct Overview \u0026 Application\u003c\/h2\u003e \u003cp\u003eThe Defro Firewood Plus 15 kW is a natural draft boiler for split logs and serves as a heat generator for hot water heating systems with a buffer tank. It is of interest to operators looking for a manually fed wood boiler with classic split log combustion, electronic primary air control, and a solid boiler construction.\u003c\/p\u003e \u003cp\u003eThe boiler is designed for operation in closed heating systems and is fueled with untreated split logs. Its power class makes it suitable for smaller to medium-sized heating systems, though the specific design must always match the heating load, buffer tank, and existing flue system.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eTechnology \u0026 Equipment\u003c\/h2\u003e \u003cp\u003eThe Firewood Plus 15 operates as a natural draft boiler with manual feeding and an electronic draft regulator. Primary air supply is controlled via the air flap, while secondary air is directed to combustion through side inlets. The construction uses convection channels and turbulators to transfer heat from the flue gases to the heating water.\u003c\/p\u003e \u003cp\u003eEquipment includes an analog boiler thermometer, a cast iron combustion grate, a steel insert in the combustion chamber, turbulators, a safety heat exchanger, and cleaning tools. The combustion and heat exchanger areas are accessible through the doors for cleaning and maintenance.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eEveryday Benefits\u003c\/h2\u003e \u003cp\u003eIn daily operation, the electronic control supports the primary air supply, making operation easier compared to purely mechanically controlled split log boilers. The analog thermometer allows for simple monitoring of the boiler temperature directly on the unit.\u003c\/p\u003e \u003cp\u003eThe side viewing windows help monitor combustion without needing to open the firebox door. Cleaning accessibility via the boiler doors and the included cleaning tools support regular maintenance of the heat exchanger and combustion chamber.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eSystem Integration \u0026 Compatibility\u003c\/h2\u003e \u003cp\u003eThe Defro Firewood Plus 15 kW is designed for integration into closed hot water heating systems. For safe and stable operation, combining it with a buffer tank is a key part of system planning.\u003c\/p\u003e \u003cp\u003eHydraulic integration must be planned with appropriate return temperature boosting, safety fittings, a thermal drain safety device, and a correctly sized flue system. Before installation, coordination with a specialist company and a chimney sweep should be carried out to ensure the boiler, buffer tank, chimney, and heating system are technically compatible.\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 technical data refers to the Defro Firewood Plus 15 kW variant.\u003c\/p\u003e \u003ctable class=\"product-th__table\"\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eRated Output\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e15 kW\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eFuel\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eUntreated split logs, 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\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e92.4%\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\"\u003eBoiler Class\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e5 according to 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\"\u003e18 Pa\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eFlue Gas Temperature\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e142 °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 159 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\"\u003eIncluded\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eBuffer Tank\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003eRequired\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eHeight\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e1350 mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003eWidth\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e555 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. 348 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\"\u003eFuse Protection\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e1.25 A\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 \u003ctr\u003e \u003ctd class=\"product-th__label\"\u003ePhases\u003c\/td\u003e \u003ctd class=\"product-th__value\"\u003e1N\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, manufacturer documentation, and the requirements of the heating system. The boiler must be placed on a suitable, load-bearing surface and requires sufficient clearances for operation, cleaning, and maintenance.\u003c\/p\u003e \u003cp\u003eHydraulically, the Firewood Plus 15 kW must be planned with a buffer tank, return temperature boosting, safety valve, expansion vessel, and thermal drain safety device. Connection to the chimney, heating system, and power supply should be carried out by qualified specialist companies.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eNotes\u003c\/h2\u003e \u003cp\u003eOnly untreated split logs with suitable residual moisture should be used for operation. Damp, treated, coated, or unsuitable fuel material can negatively affect operation, emissions, and the service life of the boiler.\u003c\/p\u003e \u003cp\u003eBefore commissioning, maintenance, and cleaning, the included manufacturer documentation must be observed. System planning must ensure that boiler output, buffer tank, return temperature, chimney draft, and heat demand are professionally matched.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv class=\"gema-section\"\u003e \u003ch2\u003eScope of Delivery\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eDefro Firewood Plus 15 kW natural draft boiler\u003c\/li\u003e \u003cli\u003eBoiler operating manual\u003c\/li\u003e \u003cli\u003eElectronic draft regulator\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 tool set\u003c\/li\u003e \u003cli\u003eCast iron combustion grate\u003c\/li\u003e \u003cli\u003eTurbulator set\u003c\/li\u003e \u003cli\u003eSafety heat exchanger\u003c\/li\u003e \u003c\/ul\u003e \u003c\/div\u003e","brand":"Defro","offers":[{"title":"Default Title","offer_id":49417939583324,"sku":"DFW15","price":2565.56,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/7796\/6428\/files\/defro-firewood-plus-15-kw-vergaserkessel-effiziente-holzheizung-6211298.webp?v=1770692623","url":"https:\/\/at.gemashop.de\/en\/products\/naturzugkessel-defro-firewood-plus-15-kw","provider":"GEMA Shop","version":"1.0","type":"link"}