{"product_id":"rojek-ktp20-naturzugkessel-scheitholzkessel-20kw","title":"Natural draft boiler ROJEK KTP 20 log boiler 20 kW","description":"\u003ch2\u003eROJEK KTP 20 natural draft boiler for logs – 20 kW\u003c\/h2\u003e    \u003cp\u003e The \u003cstrong\u003eROJEK KTP 20\u003c\/strong\u003e is a robust, hand-fed \u003cstrong\u003eNatural draft boiler for firewood\u003c\/strong\u003e With a nominal output of 20 kW, the boiler operates without a fan, relying solely on natural chimney draft, and is suitable for the reliable heat supply of single-family homes, workshops, or small commercial units. \u003c\/p\u003e    \u003cp\u003e Unlike wood gasification boilers, the combustion in the KTP 20 is based on the classic \u003cstrong\u003enatural draft principle\u003c\/strong\u003e.  The combustion air is controlled via adjustable air dampers and a thermostatic draft regulator. This means the boiler technically operates as \u003cstrong\u003eLog-fired natural draft boiler\u003c\/strong\u003e with simple, durable technology. \u003c\/p\u003e    \u003ch3\u003eHighlights\u003c\/h3\u003e    \u003cul\u003e  \u003cli\u003e⭐ Natural draft boiler for firewood without a blower\u003c\/li\u003e  \u003cli\u003e⭐ 20 kW heating output for single-family homes and smaller buildings\u003c\/li\u003e  \u003cli\u003e⭐ Robust welded steel construction\u003c\/li\u003e  \u003cli\u003e⭐ Thermostatic draft regulator for power control\u003c\/li\u003e  \u003cli\u003e⭐ EN 303-5 certified solid fuel boiler\u003c\/li\u003e  \u003c\/ul\u003e    \u003ch2\u003eArea of ​​application \u0026amp; Target audience\u003c\/h2\u003e    \u003cp\u003e The ROJEK KTP 20 is suitable for buildings with medium heating requirements. Typical applications include: \u003c\/p\u003e    \u003cul\u003e  \u003cli\u003ePrivate households and single-family homes\u003c\/li\u003e  \u003cli\u003eWorkshops and agricultural buildings\u003c\/li\u003e  \u003cli\u003eRenovation projects with existing chimney systems\u003c\/li\u003e  \u003cli\u003eWood heating systems with buffer storage\u003c\/li\u003e  \u003c\/ul\u003e    \u003cp\u003e The operation uses untreated firewood with a recommended maximum wood moisture content of 20%. \u003c\/p\u003e    \u003ch2\u003eEveryday benefits\u003c\/h2\u003e    \u003cp\u003e The natural draft boiler operates without complex electronics or fan technology. This makes the heating system particularly robust, low-maintenance, and durable. Output is regulated mechanically via the thermostatic draft regulator, which automatically controls the air supply. \u003c\/p\u003e    \u003cp\u003e The large combustion chamber allows for longer burning times, which significantly increases comfort in daily heating operation. \u003c\/p\u003e    \u003ch2\u003eTechnology \u0026amp; equipment\u003c\/h2\u003e    \u003cp\u003e The boiler consists of a robust welded steel construction with a water-cooled grate. Combustion takes place conventionally via natural draft through the chimney. \u003c\/p\u003e    \u003cul\u003e  \u003cli\u003eadjustable primary and secondary air\u003c\/li\u003e  \u003cli\u003ethermostatic draft regulator RT3\u003c\/li\u003e  \u003cli\u003eintegrated pressure gauge and thermometer\u003c\/li\u003e  \u003cli\u003eAfter-cooling loop to protect against overheating\u003c\/li\u003e  \u003cli\u003eConnection flow\/return G 2\"\u003c\/li\u003e  \u003c\/ul\u003e    \u003cp\u003e The required chimney draft is approximately 8–12 Pa. \u003c\/p\u003e    \u003ch2\u003eEfficiency \u0026amp; Environment\u003c\/h2\u003e    \u003cp\u003e The boiler meets the requirements of the European standard. \u003cstrong\u003eEN 303-5\u003c\/strong\u003e for solid fuel boilers. \u003c\/p\u003e    \u003cul\u003e  \u003cli\u003eEfficiency: approx. 75%\u003c\/li\u003e  \u003cli\u003eEnergy efficiency class: A+\u003c\/li\u003e  \u003cli\u003eExhaust gas temperature at rated power: approx. 220–300 °C\u003c\/li\u003e  \u003c\/ul\u003e    \u003cp\u003e For efficient and low-emission operation, combination with a buffer storage system is recommended. \u003c\/p\u003e    \u003ch2\u003eTechnical data\u003c\/h2\u003e    \u003ctable\u003e  \u003ctr\u003e  \u003ctd\u003eManufacturer\u003c\/td\u003e  \u003ctd\u003eROJEK\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd\u003eModel\u003c\/td\u003e  \u003ctd\u003eKTP 20\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd\u003eBoiler type\u003c\/td\u003e  \u003ctd\u003eLog-fired natural draft boiler\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd\u003eRated power\u003c\/td\u003e  \u003ctd\u003e20 kW\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd\u003eMinimum performance\u003c\/td\u003e  \u003ctd\u003e12 kW\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd\u003ecombustion chamber volume\u003c\/td\u003e  \u003ctd\u003e47.9 liters\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd\u003eWater volume\u003c\/td\u003e  \u003ctd\u003e98 liters\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd\u003eMax. log length\u003c\/td\u003e  \u003ctd\u003e33 cm\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd\u003eFlue pipe diameter\u003c\/td\u003e  \u003ctd\u003e159 mm\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd\u003eMax. operating pressure\u003c\/td\u003e  \u003ctd\u003e2 bar\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd\u003eMax.Operating temperature\u003c\/td\u003e  \u003ctd\u003e90 °C\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd\u003eWeight\u003c\/td\u003e  \u003ctd\u003e261 kg\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd\u003eEnergy efficiency class\u003c\/td\u003e  \u003ctd\u003eA+\u003c\/td\u003e  \u003c\/tr\u003e  \u003c\/table\u003e    \u003ch2\u003eScope of delivery\u003c\/h2\u003e    \u003cul\u003e  \u003cli\u003eROJEK KTP 20 boiler\u003c\/li\u003e  \u003cli\u003eOperating instructions\u003c\/li\u003e  \u003cli\u003eThermostatic pull regulator RT3 with chain\u003c\/li\u003e  \u003cli\u003eHeating system outlet valve 1\/2\"\u003c\/li\u003e  \u003cli\u003eSide ceramics\u003c\/li\u003e  \u003cli\u003ealignment screws\u003c\/li\u003e  \u003c\/ul\u003e    \u003ch2\u003eAssembly and safety instructions\u003c\/h2\u003e    \u003cp\u003e Installation must be carried out by a qualified heating contractor. A safety group and a correctly installed after-cooling loop are required. \u003c\/p\u003e    \u003cp\u003e Only dry firewood may be used as fuel. The use of liquid fuels for kindling is prohibited. \u003c\/p\u003e    \u003ch2\u003eFAQ\u003c\/h2\u003e    \u003cdetails\u003e  \u003csummary\u003e\u003cstrong\u003eIs the ROJEK KTP 20 a wood gasifier?\u003c\/strong\u003e\u003c\/summary\u003e  \u003cp\u003eNo. The KTP 20 operates as a classic natural draft boiler for logs and not according to the wood gasification principle.\u003c\/p\u003e  \u003c\/details\u003e    \u003cdetails\u003e  \u003csummary\u003e\u003cstrong\u003eDoes the boiler require electricity?\u003c\/strong\u003e\u003c\/summary\u003e  \u003cp\u003eNot for the boiler operation itself. Electricity is only needed for the heating circulation pump.\u003c\/p\u003e  \u003c\/details\u003e    \u003cdetails\u003e  \u003csummary\u003e\u003cstrong\u003eWhat length of wood can be used?\u003c\/strong\u003e\u003c\/summary\u003e  \u003cp\u003eThe maximum log length is approximately 33 cm.\u003c\/p\u003e  \u003c\/details\u003e    \u003cdetails\u003e  \u003csummary\u003e\u003cstrong\u003eIs a buffer storage tank necessary?\u003c\/strong\u003e\u003c\/summary\u003e  \u003cp\u003eNot technically required, but recommended for efficient operation.\u003c\/p\u003e  \u003c\/details\u003e    \u003cdetails\u003e  \u003csummary\u003e\u003cstrong\u003eWhat chimney draft is required?\u003c\/strong\u003e\u003c\/summary\u003e  \u003cp\u003eThe recommended chimney draft is between 8 and 12 Pascals.\u003c\/p\u003e  \u003c\/details\u003e    \u003cdetails\u003e  \u003csummary\u003e\u003cstrong\u003eWhat is the optimal wood moisture content?\u003c\/strong\u003e\u003c\/summary\u003e  \u003cp\u003eA residual moisture content between 12% and 20% is recommended.\u003c\/p\u003e  \u003c\/details\u003e    \u003cdiv class=\"cross-sell\"\u003e  \u003ch3\u003eSuitable system components\u003c\/h3\u003e  \u003cul\u003e  \u003cli\u003e\u003ca href=\"https:\/\/gemashop.de\/collections\/pufferspeicher\"\u003eBuffer storage tanks for wood-fired heating systems\u003c\/a\u003e\u003c\/li\u003e  \u003cli\u003e\u003ca href=\"https:\/\/gemashop.de\/collections\/laddomat-ruecklaufanhebung\"\u003eReturn flow increase\/Laddomat\u003c\/a\u003e\u003c\/li\u003e  \u003cli\u003e\u003ca href=\"https:\/\/gemashop.de\/collections\/sicherheitsgruppen-heizung\"\u003eSafety groups for heating systems\u003c\/a\u003e\u003c\/li\u003e  \u003cli\u003e\u003ca href=\"https:\/\/gemashop.de\/collections\/heizungsregler\"\u003eHeating controllers and controls\u003c\/a\u003e\u003c\/li\u003e  \u003c\/ul\u003e  \u003c\/div\u003e","brand":"Rojek","offers":[{"title":"right \/ vertical","offer_id":49591553196380,"sku":"RKTP20TRRV","price":2851.11,"currency_code":"EUR","in_stock":true},{"title":"left \/ vertical","offer_id":49591553130844,"sku":"RKTP20TLRV","price":2851.11,"currency_code":"EUR","in_stock":true},{"title":"left \/ horizontal","offer_id":49591553163612,"sku":"RKTP20TLRH","price":2851.11,"currency_code":"EUR","in_stock":true},{"title":"right \/ horizontal","offer_id":49591553229148,"sku":"RKTP20TRRH","price":2851.11,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/7796\/6428\/files\/vergaserkessel-rojek-ktp-20-kw-holzvergaser-fur-holz-kohle-briketts-7692012.webp?v=1770692593","url":"https:\/\/nl.gemashop.de\/en\/products\/rojek-ktp20-natural-draft-boiler-firewood-boiler-20kw","provider":"GEMA Shop","version":"1.0","type":"link"}