{"product_id":"valvula-carga-termostatica-esbe-vtc500","title":"ESBE VTC500 thermostatic load valve for biomass boilers up to 150 kW","description":"\u003ch2\u003eESBE VTC500 thermostatic load valve for biomass boilers up to 150 kW\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eESBE VTC500\u003c\/strong\u003e keeps the return to the \u003cstrong\u003esolid fuel boiler\u003c\/strong\u003e hot while it loads the accumulation tank, with no electricity and no adjustment. At Q-Tech we integrate it in the \u003ca href=\"\/en-en\/pages\/pre-montaje-avanzado\"\u003epre-assembled plant room\u003c\/a\u003e, tested in our workshop before it reaches your site.\u003c\/p\u003e\n\u003ch3\u003eSummary\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\u003cth\u003eType\u003c\/th\u003e\u003ctd\u003e3-way thermostatic load valve\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eBrand and model\u003c\/th\u003e\u003ctd\u003eESBE VTC500 series (VTC511)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eUse\u003c\/th\u003e\u003ctd\u003eReturn protection of solid fuel boilers and loading of accumulation tanks, according to ESBE\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eBoiler output\u003c\/th\u003e\u003ctd\u003eUp to 150 kW\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eOpening temperature\u003c\/th\u003e\u003ctd\u003e50, 55 or 60 °C depending on the model\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eConnection\u003c\/th\u003e\u003ctd\u003eInternal thread Rp 1 (DN 25) or Rp 1¼ (DN 32)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003ePower supply\u003c\/th\u003e\u003ctd\u003eNone: an internal thermostat controls the mixing\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eQ-Tech installation\u003c\/th\u003e\u003ctd\u003eIntegrated and tested in the \u003ca href=\"\/en-en\/pages\/pre-montaje-avanzado\"\u003eQ-Tech pre-assembled plant room\u003c\/a\u003e\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch3\u003eWhat is the ESBE VTC500?\u003c\/h3\u003e\n\u003cp\u003eThe ESBE VTC500 is a cast iron 3-way thermic valve that \u003cstrong\u003eprotects boilers up to 150 kW\u003c\/strong\u003e from return temperatures that are too low, according to ESBE. It is installed in the return pipe to the boiler and works in any mounting position.\u003c\/p\u003e\n\u003ch3\u003eWhat problem does it solve?\u003c\/h3\u003e\n\u003cp\u003eWhen water returns cold to a solid fuel boiler, combustion does not reach its temperature and tar and condensation build up. ESBE states that a high return temperature, guaranteed over the whole combustion cycle, gives higher efficiency, less tarring and a longer boiler life.\u003c\/p\u003e\n\u003cp\u003eThe VTC500 has a thermostat that opens port A when its opening temperature is reached. It regulates on two ports, so it works \u003cstrong\u003ewith no adjustment valve in the bypass\u003c\/strong\u003e, according to ESBE.\u003c\/p\u003e\n\u003ch3\u003eTechnical data\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\u003cth\u003ePressure class\u003c\/th\u003e\u003ctd\u003ePN10\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eMaximum differential pressure\u003c\/th\u003e\u003ctd\u003e100 kPa (1 bar); between A and B, 30 kPa (0.3 bar)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eMedia temperature\u003c\/th\u003e\u003ctd\u003eFrom 0 to 110 °C\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eLeakage\u003c\/th\u003e\u003ctd\u003eA to AB, maximum 1% of Kvs; B to AB, maximum 3% of Kvs\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eRangeability Kv to Kv minimum\u003c\/th\u003e\u003ctd\u003e100\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eMedia\u003c\/th\u003e\u003ctd\u003eHeating water to VDI 2035, water with up to 50% glycol and water with up to 28% ethanol\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eConnections\u003c\/th\u003e\u003ctd\u003eInternal thread Rp (EN 10226-1)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eBody and cover material\u003c\/th\u003e\u003ctd\u003eNodular cast iron EN-JS 1050\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eConformity\u003c\/th\u003e\u003ctd\u003ePressure Equipment Directive (PED), article 4.3; no CE marking\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch3\u003eModels and data by variant\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\u003cth\u003eModel\u003c\/th\u003e\u003cth\u003eConnection\u003c\/th\u003e\u003cth\u003eOpening temperature\u003c\/th\u003e\u003cth\u003eKvs (m³ per hour)\u003c\/th\u003e\u003cth\u003eDimensions A, B, C and D\u003c\/th\u003e\u003cth\u003eNet weight\u003c\/th\u003e\u003cth\u003eReference\u003c\/th\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eVTC511 DN 25\u003c\/td\u003e\u003ctd\u003eRp 1 internal\u003c\/td\u003e\u003ctd\u003e50 °C ±5 °C\u003c\/td\u003e\u003ctd\u003e9\u003c\/td\u003e\u003ctd\u003e93, 34, 69 and 47 mm\u003c\/td\u003e\u003ctd\u003e0.84 kg\u003c\/td\u003e\u003ctd\u003e51020100\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eVTC511 DN 25\u003c\/td\u003e\u003ctd\u003eRp 1 internal\u003c\/td\u003e\u003ctd\u003e55 °C ±5 °C\u003c\/td\u003e\u003ctd\u003e9\u003c\/td\u003e\u003ctd\u003e93, 34, 69 and 47 mm\u003c\/td\u003e\u003ctd\u003e0.84 kg\u003c\/td\u003e\u003ctd\u003e51020200\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eVTC511 DN 25\u003c\/td\u003e\u003ctd\u003eRp 1 internal\u003c\/td\u003e\u003ctd\u003e60 °C ±5 °C\u003c\/td\u003e\u003ctd\u003e9\u003c\/td\u003e\u003ctd\u003e93, 34, 69 and 47 mm\u003c\/td\u003e\u003ctd\u003e0.84 kg\u003c\/td\u003e\u003ctd\u003e51020300\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eVTC511 DN 32\u003c\/td\u003e\u003ctd\u003eRp 1¼ internal\u003c\/td\u003e\u003ctd\u003e50 °C ±4 °C\u003c\/td\u003e\u003ctd\u003e14\u003c\/td\u003e\u003ctd\u003e105, 38, 75 and 55 mm\u003c\/td\u003e\u003ctd\u003e1.4 kg\u003c\/td\u003e\u003ctd\u003e51020600\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eVTC511 DN 32\u003c\/td\u003e\u003ctd\u003eRp 1¼ internal\u003c\/td\u003e\u003ctd\u003e55 °C ±4 °C\u003c\/td\u003e\u003ctd\u003e14\u003c\/td\u003e\u003ctd\u003e105, 38, 75 and 55 mm\u003c\/td\u003e\u003ctd\u003e1.4 kg\u003c\/td\u003e\u003ctd\u003e51020700\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eVTC511 DN 32\u003c\/td\u003e\u003ctd\u003eRp 1¼ internal\u003c\/td\u003e\u003ctd\u003e60 °C ±4 °C\u003c\/td\u003e\u003ctd\u003e14\u003c\/td\u003e\u003ctd\u003e105, 38, 75 and 55 mm\u003c\/td\u003e\u003ctd\u003e1.4 kg\u003c\/td\u003e\u003ctd\u003e51020800\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch3\u003eCompatibility and limits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eFor boilers up to 150 kW\u003c\/strong\u003e, according to ESBE.\u003c\/li\u003e\n\u003cli\u003eMaximum differential pressure of 1 bar, and 0.3 bar between ports A and B.\u003c\/li\u003e\n\u003cli\u003eGlycol reduces the maximum valve output; ESBE asks for this to be considered when sizing it.\u003c\/li\u003e\n\u003cli\u003eThe circulation pump is not included.\u003c\/li\u003e\n\u003cli\u003eThe opening temperature is fixed; it is changed by replacing the thermostat with an \u003ca href=\"\/en-en\/products\/esbe-vtc951-replacement-thermostat\"\u003eESBE VTC951 thermostat\u003c\/a\u003e of another temperature.\u003c\/li\u003e\n\u003cli\u003eESBE recommends fitting shut-off valves on the connections to make maintenance easier.\u003c\/li\u003e\n\u003cli\u003eNo CE marking: it is pressure equipment under article 4.3 of the PED.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhen this product is not the right choice\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\u003cth\u003eProduct\u003c\/th\u003e\u003cth\u003eWhen to choose it\u003c\/th\u003e\u003cth\u003eMaximum boiler output\u003c\/th\u003e\u003cth\u003ePump included\u003c\/th\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003ca href=\"\/en-en\/products\/esbe-vtc300-thermostatic-load-valve\"\u003eESBE VTC300 load valve\u003c\/a\u003e\u003c\/td\u003e\u003ctd\u003eIf your boiler does not exceed 30 kW and you want a compact brass valve\u003c\/td\u003e\u003ctd\u003e30 kW\u003c\/td\u003e\u003ctd\u003eNo\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003ca href=\"\/en-en\/products\/esbe-ltc300-load-unit-with-pump\"\u003eESBE LTC300 load unit\u003c\/a\u003e\u003c\/td\u003e\u003ctd\u003eIf you want the valve and a high-efficiency pump in one unit\u003c\/td\u003e\u003ctd\u003e50 to 90 kW depending on the opening temperature\u003c\/td\u003e\u003ctd\u003eYes, 6 m\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch3\u003eFrequently asked questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhich model do I need?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt depends on the boiler output, the flow and the return temperature your boiler manufacturer requires. The DN 25 has Kvs 9 and the DN 32 Kvs 14; send us your boiler data and we will tell you which valve to choose.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the opening temperature be changed?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, by replacing the thermostat with an ESBE VTC951 of another temperature, according to ESBE.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it include the pump?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. If you prefer the valve and the pump in one unit, the ESBE LTC300 load unit integrates both.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it need maintenance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNot under normal conditions, according to ESBE.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I install it myself?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt is not recommended: it should be installed by a professional, following ESBE's instructions. Q-Tech delivers it fitted in the plant room or installs it with an Expert Technician.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the delivery time?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWe have it \u003cstrong\u003ein stock in Málaga\u003c\/strong\u003e and dispatch it as soon as we confirm your order.\u003c\/p\u003e\n\u003ch3\u003eQ-Tech installation and support\u003c\/h3\u003e\n\u003cp\u003eQ-Tech fits the VTC500 in the \u003ca href=\"\/en-en\/pages\/pre-montaje-avanzado\"\u003epre-assembled plant room\u003c\/a\u003e: assembled and \u003cstrong\u003etested in our workshop\u003c\/strong\u003e, it arrives ready to connect to the boiler and the tank. You can book \u003ca href=\"\/en-en\/products\/tecnico-experto-pre-montaje-nave\"\u003eworkshop pre-assembly\u003c\/a\u003e, an \u003ca href=\"\/en-en\/products\/tecnico-experto-in-situ-horas\"\u003eon-site hourly Expert Technician\u003c\/a\u003e or a \u003ca href=\"\/en-en\/products\/expert-technician-remote-technical-call\"\u003etechnical call\u003c\/a\u003e to choose the model. See also our \u003ca href=\"\/en-en\/collections\/biomasa\"\u003ebiomass collection\u003c\/a\u003e or message us on \u003ca href=\"https:\/\/wa.me\/qtechhouses\" target=\"_blank\" rel=\"noopener\"\u003eWhatsApp\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/esbe.eu\/storage\/16A7F6153E96E7A8EFEFFFA0CA7F10FC90BD78FCF141BF3C03E9FCEC53BCA0EE\/013ca91e1880412899eec7cbcd7df738\/pdf\/media\/3f0a0a5172e14dc9956c0da6c42dfcd4\/VTC500_en_M_LR.pdf\" target=\"_blank\" rel=\"noopener\"\u003eESBE VTC500 series data sheet\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/esbe.eu\/storage\/2FA8C815A77FABF4541E49EA52F73E4E82F3A427A9F9E0773BA0102E3A55B6FD\/39f955056fa74bba86e511b946899811\/pdf\/media\/87edd02c37ce4686a4163936e05aff97\/Anv_VTC500_98140298_ver%20E_lr.pdf\" target=\"_blank\" rel=\"noopener\"\u003eVTC500 installation instructions (multilingual)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/esbe.eu\/storage\/156247B2517BE554545B6B2911478FEE95220B1781EFAD4D6423A61B6FA52EB8\/fadd130b81cc4c99b213653255387e09\/pdf\/media\/fe3b534abdc94b2dbf7528195f1a7614\/DoC_VTC500_E.pdf\" target=\"_blank\" rel=\"noopener\"\u003eDeclaration of conformity\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ciframe src=\"https:\/\/www.youtube-nocookie.com\/embed\/wxCraO7oiiY\" title=\"ESBE VTC500 load valve (ESBE video)\" width=\"560\" height=\"315\" allowfullscreen\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp class=\"qt-nota-stock\"\u003e\u003cstrong\u003eAvailability and lead times:\u003c\/strong\u003e this item is in stock at our warehouse. Occasionally, depending on the time of year, the stock update may contain an error. If no units are available when you place your order, we will order it urgently and inform you immediately of the updated delivery time.\u003c\/p\u003e","brand":"ESBE","offers":[{"title":"VTC511 Rp 1 · apertura 50 °C (51020100)","offer_id":59045867258200,"sku":"SE-CO10245","price":282.7,"currency_code":"EUR","in_stock":true},{"title":"VTC511 Rp 1 · apertura 55 °C (51020200)","offer_id":59045867290968,"sku":"SE-CO10246","price":282.7,"currency_code":"EUR","in_stock":true},{"title":"VTC511 Rp 1 · apertura 60 °C (51020300)","offer_id":59045867323736,"sku":"SE-CO10247","price":282.7,"currency_code":"EUR","in_stock":true},{"title":"VTC511 Rp 1¼ · apertura 50 °C (51020600)","offer_id":59045867356504,"sku":"SE-CO10250","price":289.84,"currency_code":"EUR","in_stock":true},{"title":"VTC511 Rp 1¼ · apertura 55 °C (51020700)","offer_id":59045867389272,"sku":"SE-CO10251","price":289.84,"currency_code":"EUR","in_stock":true},{"title":"VTC511 Rp 1¼ · apertura 60 °C (51020800)","offer_id":59045867422040,"sku":"SE-CO10252","price":289.84,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0015\/4592\/8792\/files\/esbe-vtc500-vtc511-valvula-carga-fundicion.webp?v=1793877996","url":"https:\/\/q-tech.es\/en-int\/products\/esbe-vtc500-thermostatic-load-valve","provider":"Q-Tech ® ","version":"1.0","type":"link"}