{"product_id":"aerotermo-ad-acqua-s4-3s-501kw","title":"Blow Air S4-3S Water-Heated Air Heater – 50.1 kW (3 speeds)","description":"\u003cp\u003eThe Blow Air S4-3S water fan heater offers a nominal heating output of 50.1 kW (3 speeds) \/ 38.5 kW (2 speeds) \/ 27.5 kW (1 speed), a maximum air flow of 3,350 m³\/h (3 speeds), a throw of 18 m, 2 heat exchanger rows, a water capacity of 2.0 dm³, and a powder-coated galvanized steel casing. Distributed in Italy by Krollit.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating output (speed 3\/2\/1):\u003c\/strong\u003e 50.1 \/ 38.5 \/ 27.5 kW\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating capacity range:\u003c\/strong\u003e 4.17–66.2 kW\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir flow (speed 3\/2\/1):\u003c\/strong\u003e 3,350 \/ 2,250 \/ 1,400 m³\/h\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsothermal throw:\u003c\/strong\u003e 18 m\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat exchanger rows:\u003c\/strong\u003e 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater capacity:\u003c\/strong\u003e 2.0 dm³\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCasing:\u003c\/strong\u003e Powder-coated galvanized steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e approx. 29 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWho uses the S4-3S and for what\u003c\/h3\u003e\n\u003cp\u003eThe Blow Air S4-3S water fan heater is an air heater connected to the central hydronic system: it uses hot water from the existing heating system (boiler, heat pump, combined heat and power unit) to heat the ambient air via a 2-row heat exchanger. With 50.1 kW of heating power at maximum speed and an air flow of 3,350 m³\/h, it is dimensioned for large industrial environments (over 500 m²). The 3-speed fan allows power modulation according to need. Krollit customers use it in warehouses, mechanical workshops, storage facilities, and logistics centers that already have a hydronic system and are looking for an efficient distribution terminal.\u003c\/p\u003e\n\n\u003ch3\u003eWho is the Blow Air S4-3S for\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eProfile\u003c\/th\u003e\n\u003cth\u003eCompatibility\u003c\/th\u003e\n\u003cth\u003eReason\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eHome use\u003c\/td\u003e\n\u003ctd\u003eNot suitable\u003c\/td\u003e\n\u003ctd\u003eDimensioned for industrial environments. For home use, consider wall-mounted fan coil units with lower power.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarehouse \/ workshop with hydronic system\u003c\/td\u003e\n\u003ctd\u003eIdeal\u003c\/td\u003e\n\u003ctd\u003e50.1 kW and 3,350 m³\/h air flow: dimensioned for heating large industrial environments. Connection to the existing system.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAutonomous system without hydronic\u003c\/td\u003e\n\u003ctd\u003eNot suitable\u003c\/td\u003e\n\u003ctd\u003eThe water fan heater requires an existing hydronic system (boiler or heat pump). For environments without a hydronic system, consider electric or gas fan heaters.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e environments without a central hydronic system; home use; installation without a specialized technician for the hydraulic connection.\u003c\/p\u003e\n\n\u003ch3\u003eThermal and air handling data\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal heating output (speed 3)\u003c\/td\u003e\n\u003ctd\u003e50.1 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal heating output (speed 2)\u003c\/td\u003e\n\u003ctd\u003e38.5 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal heating output (speed 1)\u003c\/td\u003e\n\u003ctd\u003e27.5 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeating capacity range\u003c\/td\u003e\n\u003ctd\u003e4.17–66.2 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum air flow (speed 3)\u003c\/td\u003e\n\u003ctd\u003e3,350 m³\/h\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum air flow (speed 2)\u003c\/td\u003e\n\u003ctd\u003e2,250 m³\/h\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum air flow (speed 1)\u003c\/td\u003e\n\u003ctd\u003e1,400 m³\/h\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsothermal throw\u003c\/td\u003e\n\u003ctd\u003e18 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eConstruction and hydraulic data\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of heat exchanger rows\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater capacity\u003c\/td\u003e\n\u003ctd\u003e2.0 dm³\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum fluid temperature\u003c\/td\u003e\n\u003ctd\u003e120 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCasing\u003c\/td\u003e\n\u003ctd\u003ePowder-coated galvanized steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFan\u003c\/td\u003e\n\u003ctd\u003e3 speeds – IP 54 – ErP 2015\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIndicative dimensions (L × W × H)\u003c\/td\u003e\n\u003ctd\u003e700 × 500 × 430 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eapprox. 29 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompliance\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFan directive\u003c\/td\u003e\n\u003ctd\u003eErP 2015\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFan protection\u003c\/td\u003e\n\u003ctd\u003eIP 54\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eLogistics\u003c\/h3\u003e\n\u003cp\u003eShipping 5–9 business days (7 days for the South). Spare parts available with 3–5 business day shipping. Customer support in Italian available.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat water temperature is needed for the S4-3S?\u003c\/summary\u003e\n\u003cp\u003eThe fan heater is designed to operate with a maximum fluid temperature of 120 °C, compatible with any standard central hydronic system (gas boiler, heat pump, district heating). The nominal heating output is usually measured at a supply\/return temperature of 80\/60 °C: at lower temperatures (e.g., 60\/40 °C with heat pumps), the effective power is proportionally reduced.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between S1, S2, S3, and S4?\u003c\/summary\u003e\n\u003cp\u003eThe four models differ in heating power and air flow: S1 (50.1 kW, 3,350 m³\/h), S2 (23.4 kW, 2,000 m³\/h), S3 (36.9 kW, 1,800 m³\/h), S4 (50.1 kW, 3,350 m³\/h). The choice depends on the room volume and thermal dispersion. A heating and plumbing technician can correctly size the model for the specific site.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the hydraulic connection require a specialized technician?\u003c\/summary\u003e\n\u003cp\u003eYes. Connection to the hydronic system (supply and return pipes, control valve, air vent) requires a qualified heating and plumbing technician. Krollit provides complete technical documentation and an installation manual in Italian. Installation is not included in the supply.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the mounting bracket included?\u003c\/summary\u003e\n\u003cp\u003eThe mounting bracket for wall or ceiling fixing is available as a dedicated accessory. Please check with Krollit for the availability of the specific bracket for the S4-3S model at the time of order.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the fan compatible with thermostats and automation systems?\u003c\/summary\u003e\n\u003cp\u003eYes. The S series fan heaters can be equipped with accessories for automated control (thermostats, speed controllers, BMS systems). Contact Krollit for available automation options for the S4-3S.\u003c\/p\u003e\n\u003c\/details\u003e","brand":"Blow Air","offers":[{"title":"Default Title","offer_id":50693173150024,"sku":"WHS4-3S-1787","price":1039.96,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0891\/2139\/0920\/files\/Aerotermo_ad_acqua_S4-3S.png?v=1751202612","url":"https:\/\/www.krollit.com\/products\/aerotermo-ad-acqua-s4-3s-501kw","provider":"Krollit","version":"1.0","type":"link"}