{"product_id":"rojek-ktp25-naturzugkessel-scheitholzkessel-25kw","title":"Natural draft boiler ROJEK KTP 25 log boiler 25 kW","description":"\u003ch2\u003eROJEK KTP 25 natural draft boiler for firewood – 25 kW\u003c\/h2\u003e\n\n\u003cp\u003e\nThe \u003cstrong\u003eROJEK KTP 25\u003c\/strong\u003e is a hand-fed \u003cstrong\u003enatural draft boiler for firewood\u003c\/strong\u003e with a nominal output of 25 kW. \nThe boiler operates without a fan, relying solely on natural chimney draft, and is suitable for reliable heat supply \nfor single-family homes, agricultural buildings, or smaller commercial units.\n\u003c\/p\u003e\n\n\u003cp\u003e\nImportant: The boiler is occasionally referred to as a wood gasifier. Technically, however, it is a \nclassic \u003cstrong\u003efirewood natural draft boiler\u003c\/strong\u003e. Combustion occurs via natural chimney draft and \nis mechanically controlled by air flaps and a thermostatic draft regulator. \nThis allows the KTP 25 to operate with simple, robust, and durable heating technology.\n\u003c\/p\u003e\n\n\u003ch3\u003eHighlights\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e⭐ Natural draft boiler for split logs without combustion fan\u003c\/li\u003e\n\u003cli\u003e⭐ 25 kW heating output for residential buildings and smaller commercial properties\u003c\/li\u003e\n\u003cli\u003e⭐ Robust welded steel construction\u003c\/li\u003e\n\u003cli\u003e⭐ Thermostatic draft regulator for automatic output control\u003c\/li\u003e\n\u003cli\u003e⭐ EN 303-5 certified 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 25 is suitable for buildings with medium heat demand. Typical applications include:\n\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eSingle-family houses and larger residential buildings\u003c\/li\u003e\n\u003cli\u003eWorkshops and agricultural buildings\u003c\/li\u003e\n\u003cli\u003eRenovation projects with existing chimney system\u003c\/li\u003e\n\u003cli\u003eWood heating systems in combination with buffer tanks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\nNaturally seasoned log wood is used as fuel. For efficient combustion, a \nwood moisture content of no more than 20% is recommended.\n\u003c\/p\u003e\n\n\u003ch2\u003eEveryday advantages\u003c\/h2\u003e\n\n\u003cp\u003e\nThanks to the simple natural draft principle, the boiler operates without complex electronics or fan technology. \nThis makes the heating technology particularly robust, durable, and low-maintenance.\n\u003c\/p\u003e\n\n\u003cp\u003e\nThe generously sized combustion chamber allows for longer burn times and reduces the number of reloading intervals \nin daily heating 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 via natural draft through 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\u003eintegrated cooling loop for overheating protection\u003c\/li\u003e\n\u003cli\u003eConnection flow \/ return G 2\u0026quot;\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\nThe recommended 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, the use of a buffer 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 25\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\u003eNominal output\u003c\/td\u003e\n\u003ctd\u003e25 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum output\u003c\/td\u003e\n\u003ctd\u003e15 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCombustion chamber volume\u003c\/td\u003e\n\u003ctd\u003e61.6 liters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater volume\u003c\/td\u003e\n\u003ctd\u003e109 liters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. log length\u003c\/td\u003e\n\u003ctd\u003e43 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\u003e301 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 25 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 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\u003eInstallation and safety instructions\u003c\/h2\u003e\n\n\u003cp\u003e\nInstallation must be carried out by a qualified heating contractor. \nThe connection 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 25 a wood gasifier?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eNo. The KTP 25 operates as a classic natural draft boiler for split logs and not according to 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 43 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 strictly required, 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 wood moisture content is optimal?\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":49592188567900,"sku":"RKTP25TLRH","price":3115.43,"currency_code":"EUR","in_stock":true},{"title":"left \/ vertical","offer_id":49592188535132,"sku":"RKTP25TLRV","price":3115.43,"currency_code":"EUR","in_stock":true},{"title":"right \/ horizontal","offer_id":49592188633436,"sku":"RKTP25TRRH","price":3115.43,"currency_code":"EUR","in_stock":true},{"title":"right \/ vertical","offer_id":49592188600668,"sku":"RKTP25TRRV","price":3115.43,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/7796\/6428\/files\/vergaserkessel-rojek-ktp-25-kw-holzvergaser-vielseitig-effizient-7489643.webp?v=1770693389","url":"https:\/\/hr.gemashop.de\/en\/products\/rojek-ktp25-kessel-s-prirodnim-propuhom-za-cjepanice-25kw","provider":"GEMA Shop","version":"1.0","type":"link"}