{"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 split logs – 20 kW\u003c\/h2\u003e\n\n\u003cp\u003e\nThe \u003cstrong\u003eROJEK KTP 20\u003c\/strong\u003e is a robust hand-fed \u003cstrong\u003enatural draft boiler for split logs\u003c\/strong\u003e with a rated output of 20 kW. \nThe boiler operates without a fan, relying solely on natural chimney draft, and is suitable for reliable heat supply to \nsingle-family homes, workshops, or smaller commercial units.\n\u003c\/p\u003e\n\n\u003cp\u003e\nUnlike wood gasification boilers, combustion in the KTP 20 is based on the classic \u003cstrong\u003enatural draft principle\u003c\/strong\u003e. \nThe combustion air is controlled via adjustable air flaps and a thermostatic draft regulator. As a result, the boiler operates \ntechnically as a \u003cstrong\u003esplit log natural draft boiler\u003c\/strong\u003e with simple, durable technology.\n\u003c\/p\u003e\n\n\u003ch3\u003eHighlights\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e⭐ Natural draft boiler for log wood without a fan\u003c\/li\u003e\n\u003cli\u003e⭐ 20 kW heat output for single-family homes and smaller buildings\u003c\/li\u003e\n\u003cli\u003e⭐ Robust welded steel construction\u003c\/li\u003e\n\u003cli\u003e⭐ Thermostatic draft regulator for output control\u003c\/li\u003e\n\u003cli\u003e⭐ EN 303-5 tested solid fuel boiler\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eApplication area \u0026amp; target group\u003c\/h2\u003e\n\n\u003cp\u003e\nThe ROJEK KTP 20 is suitable for buildings with medium heat demand. Typical applications include:\n\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003ePrivate households and single-family homes\u003c\/li\u003e\n\u003cli\u003eWorkshops and agricultural buildings\u003c\/li\u003e\n\u003cli\u003eRenovation projects with an existing chimney system\u003c\/li\u003e\n\u003cli\u003eWood heating systems with buffer storage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\nOperation is carried out with untreated split logs with a recommended wood moisture content of maximum 20%.\n\u003c\/p\u003e\n\n\u003ch2\u003eEveryday advantages\u003c\/h2\u003e\n\n\u003cp\u003e\nThe natural draft boiler operates without complex electronics or fan technology. This makes the heating technology \nespecially robust, low-maintenance, and durable. The output control is mechanical via the \nthermostatic draft regulator, which automatically controls the air supply.\n\u003c\/p\u003e\n\n\u003cp\u003e\nThanks to the large combustion chamber, longer burn times are possible, which significantly increases comfort in daily \nheating operation.\n\u003c\/p\u003e\n\n\u003ch2\u003eTechnology \u0026amp; equipment\u003c\/h2\u003e\n\n\u003cp\u003e\nThe boiler consists of a sturdy welded steel construction with a water-cooled grate. \nCombustion takes place classically in natural draft mode via the chimney draft.\n\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eadjustable primary and secondary air\u003c\/li\u003e\n\u003cli\u003ethermostatic draft regulator RT3\u003c\/li\u003e\n\u003cli\u003eintegrated pressure gauge and thermometer\u003c\/li\u003e\n\u003cli\u003ecooling loop to protect against overheating\u003c\/li\u003e\n\u003cli\u003econnection flow\/return G 2\u0026quot;\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\nThe required chimney draft is approximately 8–12 Pa.\n\u003c\/p\u003e\n\n\u003ch2\u003eEfficiency \u0026amp; Environment\u003c\/h2\u003e\n\n\u003cp\u003e\nThe boiler meets the requirements of the European standard \u003cstrong\u003eEN 303-5\u003c\/strong\u003e for solid fuel boilers.\n\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eEfficiency: approx. 75%\u003c\/li\u003e\n\u003cli\u003eEnergy efficiency class: A+\u003c\/li\u003e\n\u003cli\u003eFlue gas temperature at rated output: approx. 220–300 °C\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\nFor efficient and low-emission operation, combination with a buffer storage tank is recommended.\n\u003c\/p\u003e\n\n\u003ch2\u003eTechnical data\u003c\/h2\u003e\n\n\u003ctable\u003e\n\u003ctbody\u003e\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eROJEK\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eKTP 20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBoiler type\u003c\/td\u003e\n\u003ctd\u003eLog wood natural draft boiler\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated output\u003c\/td\u003e\n\u003ctd\u003e20 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum output\u003c\/td\u003e\n\u003ctd\u003e12 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCombustion chamber volume\u003c\/td\u003e\n\u003ctd\u003e47.9 liters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater volume\u003c\/td\u003e\n\u003ctd\u003e98 liters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. log length\u003c\/td\u003e\n\u003ctd\u003e33 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlue pipe diameter\u003c\/td\u003e\n\u003ctd\u003e159 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. operating pressure\u003c\/td\u003e\n\u003ctd\u003e2 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. operating temperature\u003c\/td\u003e\n\u003ctd\u003e90 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e261 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnergy efficiency class\u003c\/td\u003e\n\u003ctd\u003eA+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\n\u003ch2\u003eScope of delivery\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eROJEK KTP 20 heating boiler\u003c\/li\u003e\n\u003cli\u003eOperating instructions\u003c\/li\u003e\n\u003cli\u003ethermostatic draft regulator RT3 with chain\u003c\/li\u003e\n\u003cli\u003eheating system outlet valve 1\/2\u0026quot;\u003c\/li\u003e\n\u003cli\u003eside ceramics\u003c\/li\u003e\n\u003cli\u003ealignment screws\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eassembly and safety instructions\u003c\/h2\u003e\n\n\u003cp\u003e\nInstallation must be carried out by a qualified heating contractor. \nConnection of a safety group and a correctly installed cooling loop is required.\n\u003c\/p\u003e\n\n\u003cp\u003e\nOnly dry split logs may be used as fuel. \nThe use of liquid fuels for lighting the fire is not permitted.\n\u003c\/p\u003e\n\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eIs the ROJEK KTP 20 a wood gasifier?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eNo. The KTP 20 operates as a classic natural draft boiler for split logs and not on the wood gasification principle.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eDoes the boiler require electricity?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eNot for the boiler operation itself. Electricity is only needed for the heating circulation pump.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat length of wood can be used?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eThe maximum split log length is about 33 cm.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eIs a buffer tank necessary?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eTechnically not mandatory, but recommended for efficient operation.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat chimney draft is required?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eThe recommended chimney draft is between 8 and 12 Pascal.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is the optimal wood moisture content?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eA residual moisture content between 12% and 20% is recommended.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdiv class=\"cross-sell\"\u003e\n\u003ch3\u003eMatching system components\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/gemashop.de\/collections\/pufferspeicher\"\u003eBuffer tanks for wood heating systems\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/gemashop.de\/collections\/laddomat-ruecklaufanhebung\"\u003eReturn temperature boost \/ Laddomat\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/gemashop.de\/collections\/sicherheitsgruppen-heizung\"\u003eSafety groups for heating systems\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/gemashop.de\/collections\/heizungsregler\"\u003eHeating controllers and controls\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Rojek","offers":[{"title":"left \/ horizontal","offer_id":49591553163612,"sku":"RKTP20TLRH","price":2910.71,"currency_code":"EUR","in_stock":true},{"title":"left \/ vertical","offer_id":49591553130844,"sku":"RKTP20TLRV","price":2910.71,"currency_code":"EUR","in_stock":true},{"title":"right \/ horizontal","offer_id":49591553229148,"sku":"RKTP20TRRH","price":2910.71,"currency_code":"EUR","in_stock":true},{"title":"right \/ vertical","offer_id":49591553196380,"sku":"RKTP20TRRV","price":2910.71,"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:\/\/ee.gemashop.de\/en\/products\/rojek-ktp20-loodusliku-tombega-katel-palkkuttekatel-20kw","provider":"GEMA Shop","version":"1.0","type":"link"}