{"product_id":"valvula-carga-termostatica-esbe-vtc300","title":"ESBE VTC300 thermostatic load valve for biomass boilers","description":"\u003ch2\u003eESBE VTC300 thermostatic load valve for biomass boilers up to 30 kW\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eESBE VTC300\u003c\/strong\u003e keeps the return temperature to the \u003cstrong\u003esolid fuel boiler\u003c\/strong\u003e high while it loads the accumulation tank, with no electricity and no adjustment. At Q-Tech we fit 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 VTC300 series (VTC311 and VTC312)\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 30 kW\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eOpening temperature\u003c\/th\u003e\u003ctd\u003e45, 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 ¾ (VTC311) or external thread G 1 (VTC312), DN 20\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 VTC300?\u003c\/h3\u003e\n\u003cp\u003eThe ESBE VTC300 is a 3-way thermic valve that \u003cstrong\u003eprotects the boiler from cold return water\u003c\/strong\u003e, 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, stable return temperature gives higher efficiency, less tarring and a longer boiler life.\u003c\/p\u003e\n\u003cp\u003eThe VTC300 starts to open port A when the water at outlet AB reaches its opening temperature, and fully closes port B when port A exceeds it by 10 °C, according to ESBE. It regulates on two ports, so it works \u003cstrong\u003ewith no adjustment valve in the bypass\u003c\/strong\u003e.\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) mixing; 30 kPa (0.3 bar) diverting\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eMedia temperature\u003c\/th\u003e\u003ctd\u003eFrom 0 to 100 °C\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eLeakage\u003c\/th\u003e\u003ctd\u003eA to AB, tight sealing; 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) and external thread G (ISO 228-1)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eMaterial\u003c\/th\u003e\u003ctd\u003eDZR brass CW625N, resistant to dezincification\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eDimensions\u003c\/th\u003e\u003ctd\u003eA 70 mm, B 42 mm, C 42 mm, D 46 mm\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\u003eNet weight\u003c\/th\u003e\u003cth\u003eReference\u003c\/th\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eVTC311\u003c\/td\u003e\u003ctd\u003eRp ¾ internal\u003c\/td\u003e\u003ctd\u003e45 °C ±2 °C\u003c\/td\u003e\u003ctd\u003e3.2\u003c\/td\u003e\u003ctd\u003e0.53 kg\u003c\/td\u003e\u003ctd\u003e51000100\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eVTC311\u003c\/td\u003e\u003ctd\u003eRp ¾ internal\u003c\/td\u003e\u003ctd\u003e55 °C ±2 °C\u003c\/td\u003e\u003ctd\u003e3.2\u003c\/td\u003e\u003ctd\u003e0.53 kg\u003c\/td\u003e\u003ctd\u003e51000200\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eVTC312\u003c\/td\u003e\u003ctd\u003eG 1 external\u003c\/td\u003e\u003ctd\u003e45 °C ±2 °C\u003c\/td\u003e\u003ctd\u003e3.2\u003c\/td\u003e\u003ctd\u003e0.51 kg\u003c\/td\u003e\u003ctd\u003e51001500\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eVTC312\u003c\/td\u003e\u003ctd\u003eG 1 external\u003c\/td\u003e\u003ctd\u003e55 °C ±2 °C\u003c\/td\u003e\u003ctd\u003e3.2\u003c\/td\u003e\u003ctd\u003e0.51 kg\u003c\/td\u003e\u003ctd\u003e51001600\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eVTC312\u003c\/td\u003e\u003ctd\u003eG 1 external\u003c\/td\u003e\u003ctd\u003e60 °C ±2 °C\u003c\/td\u003e\u003ctd\u003e3.2\u003c\/td\u003e\u003ctd\u003e0.51 kg\u003c\/td\u003e\u003ctd\u003e51001700\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 30 kW\u003c\/strong\u003e, according to ESBE.\u003c\/li\u003e\n\u003cli\u003eMaximum differential pressure of 1 bar when mixing and 0.3 bar when diverting.\u003c\/li\u003e\n\u003cli\u003eWith 30 to 50% glycol, the maximum valve output drops by 30 to 40%, according to ESBE.\u003c\/li\u003e\n\u003cli\u003eThe circulation pump is not included; ESBE asks for it to be sized with the pressure drop of the valve and the rest of the system.\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-vtc931-replacement-thermostat\"\u003eESBE VTC931 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-vtc500-thermostatic-load-valve\"\u003eESBE VTC500 load valve\u003c\/a\u003e\u003c\/td\u003e\u003ctd\u003eIf your boiler is above 30 kW\u003c\/td\u003e\u003ctd\u003e150 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 opening temperature should I choose?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe one your boiler manufacturer requires for the return: 45, 55 or 60 °C. If you tell us your boiler model, we will tell you which valve you need.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between the VTC311 and the VTC312?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOnly the connection: the VTC311 has an internal Rp ¾ thread and the VTC312 an external G 1 thread. Both are DN 20 with Kvs 3.2.\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 VTC931 of another temperature. The ESBE video in the Documentation section shows the change.\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\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 VTC300 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:\/\/www.esbe.eu\/storage\/1D348AEF194AD994B56CDAE7A4A681B1F2221C7FE7DB02EB5E97726AA111ED01\/2bbfa67ef86a4f4e808b843ae1d5c90a\/pdf\/media\/e472b88e91e44ab28c09285d29cda3c9\/VTC300_es_L_LR.pdf\" target=\"_blank\" rel=\"noopener\"\u003eESBE VTC300 series data sheet (in Spanish)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/esbe.eu\/storage\/ADADAEC99CE88932F594075653E0425D26146213BEED97456BB0C3BE0956E42B\/026a28f58e4c49db8798cc82b3336257\/pdf\/media\/0948f002312e4e91b1d482853f3b0e0f\/Anv_VTC300_VTC400_98140286_ver%20F_lr.pdf\" target=\"_blank\" rel=\"noopener\"\u003eVTC300 installation instructions (multilingual)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/esbe.eu\/storage\/DB8EE6B4827C2C3B3443C4E69EA55E84828A6E0A48C98B6D85100C53B792C128\/62eb6d015ed249258e563f8268834a69\/pdf\/media\/2f4a127d805447aab67b407a147d4660\/DoC_VTC300_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\/mLzVHvq8khU\" title=\"Replacing the thermostat of the ESBE VTC300 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":"VTC311 Rp ¾ · apertura 45 °C (51000100)","offer_id":59045841240408,"sku":"SE-CO10240","price":248.44,"currency_code":"EUR","in_stock":true},{"title":"VTC311 Rp ¾ · apertura 55 °C (51000200)","offer_id":59045841273176,"sku":"SE-CO10241","price":248.44,"currency_code":"EUR","in_stock":true},{"title":"VTC312 G 1 · apertura 45 °C (51001500)","offer_id":59045841305944,"sku":"SE-CO10340","price":248.44,"currency_code":"EUR","in_stock":true},{"title":"VTC312 G 1 · apertura 55 °C (51001600)","offer_id":59045841338712,"sku":"SE-CO10341","price":248.44,"currency_code":"EUR","in_stock":true},{"title":"VTC312 G 1 · apertura 60 °C (51001700)","offer_id":59045841371480,"sku":"SE-CO10342","price":248.44,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0015\/4592\/8792\/files\/esbe-vtc300-vtc312-valvula-carga-g1.webp?v=1793877748","url":"https:\/\/q-tech.es\/en-int\/products\/esbe-vtc300-thermostatic-load-valve","provider":"Q-Tech ® ","version":"1.0","type":"link"}