
The new system Gas condensing boilers for high performance TheGWSdecidedonmodernenergy-savingtechnology byELCO–theRENDAMAX3406andRENDAMAX3408 gascondensingboilers–inplaceoftheobsoleteoil-fired heatingboilers.Inaddition,amodernblock-typeheating powerstationwasinstalled,withanelectricaloutputof 49.5kWandathermaloutputof97.2kW.Takingboth componentsboilerandheatingpowerstation,into account,averyhighefficiencyofabout96%wasachieved inthefirstyearaftercommissioning. TheELCOgascondensingboilersarecharacterisedbytheir highheatoutput,lowconsumptionandlowemissionvalues. Inaddition,theyarecompactandspace-saving.Theener- geticperformanceofELCOboilersisveryhigh. Thankstotheinfiniteadjustmentofthemodulationoftheburn- erpower,theburnersadaptpreciselytotheactualheating demandsinthebuilding.Thehighmodulationshortensthe burnerrunningtimes,andtherun-upemissionsaresignifi- cantlyreduced.Thankstothewidemodulationrangeof470– 3,860kW,greatquantitiesofenergycanbesaved.Thisiseasy onthewearparts,andreducesthemaintenanceeffort.With theadvancedboilermanagementwithloadregulationand digital,automaticburnercontrols,itwouldalsobepossible toarrangeseveralboilersinacascade. Equipment Boiler Rated power Total power Total energy consumption Old system ViessmannLTboiler 1,500/1,750kW 5,000kW ≈6,205MWhperyear,oil Lossthroughwastegases15% Equipment Boilers Rated power Total power Total energy consumption New system R3406+R3408 1,189+1,456kW 2,685kW ≈5,026MWhperyear,gas Energy-supplycontractingforablockofflats Modernheatingtechnologythat convinceswithefficiency