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The types BK20 to BK250 –Type BK20 BK30 BK50Nominal heating output kW 15 – 21 22 – 32 33 – 49Maximum operating pressure bar 3 3 3Boiler water capacity Litres 58 70 110Flue pipe, co-axial ID/OD mm 80/125 80/125 80/125Flue pipe (for exhaust only) Ø mm 80 80 80Flue gas temperature max. ° C ca. 47 ca. 47 ca. 47Normal boiler efficiency referring to Hi according to DIN EN 303%%99 (HS)105,7 (Hi)99 (HS)105,7 (Hi)99 (HS)105,7 (Hi)Length mm 1123 1269 1548Width mm 544 580 645Height mm 1163 1148 1474Weight kg 219 261 482Type BK70 BK100 BK250Nominal heating output kW 50 – 70 71 – 120 150 – 250Maximum operating pressure bar 3 4 4Boiler water capacity Litres 110 200 480Flue pipe, co-axial ID/OD mm 110/160 110/160 160Flue pipe (for exhaust only) Ø mm 110 110 160Flue gas temperature max. ° C ca. 47 ca. 47 ca. 47Normal boiler efficiency referring to Hi according to DIN EN 303%%99 (HS)105,7 (Hi)99 (HS)105,7 (Hi)99 (HS)105,7 (Hi)Length mm 1548 1738 1807Width mm 645 850 1171Height mm 1474 1632 1991Weight kg 482 759 1392

convincing powerThe highest efficiency plusenvironmental protection?Yes, this exists.Unused energy is a waste of money andthis in times of continually rising energycosts. The incomplete burning of fuel andhigh flue gas temperatures damage andpollute our environment.The Kroll fully condensing boiler unites thehighest efficiency with high environmentalconsiderations.The residual energy of the flue gases willbe utilised via heat recovery.Sulphur, created by the combustionprocess, is bound and neutralised, andthus not transmitted through the exhaustgases, saving the environment.Heating technology for generations –a perfect heating system.The technology is both ingenious andsimple.n Extremely high efficiencythrough the recovery of the residualheat from the flue gas. By permanentcondensation, the consumption ofcombustible is minimized and theflue gas temperature is reduced toa minimum (about 47°C).This leads to efficiency degrees(according to a normal guideline DINEN 303 of Hi 105,7 % and Hs 99 %.n Permanent condensing operationEven at high temperatures of 80/60°C,the boiler is still permanently condensing.n Room sealedThe combustion air is taken in via thedouble-tube pipe system which makesthe unit room sealed.So no additional combustion air isrequired. This contributes to a positiveenergy balance of the buildingn Flue pipe systemDue to the low flue gas temperatures,plastic flue pipes can be utilised, savingon installation costs.n CombustiblesStandard combustibles (fuel oil andnatural gas) can be utilised. By usinga secondary heat exchanger for therecovery of the residual heat and bythe neutralization box, there is no needto take sulphur-free heating oil, whichsaves costs again.n Control system Conform 6.0A compact micro control to controltwo mixed heating circuits (2nd heatingcircuit optional), domestic hot water,circulation pump, burner control 1or stages, cascade control, heatmanager, modulating flue gas fan andboiler circuit pump, automatic summershutdown, pump blocking protection,operating hours counter, party mode,pavement heating mode, energyrecovery via solar tank or buffer.Display with illuminated background,easy handling. Control is extendableto 16 heating circuits via additionalcontroller, eBus, distance surveillancepossible via GSM or internet (additionaltool necessary).n Cascade control(up to 8 boilers) via a master control!n RC7000LAN interfact to eBus controllersallows distance control of allconnected TEM controls via internetand browser.– readout and change of theparametrization– readout and change of the timeprogrammes– datalogging of up to 10 freelydefinable temperatures or set valuesor exits of all connected controls;the data is put on the SD card ascsv file every day– time synchronization of the controlswith an internet time server– visualization of the plant with thefree additional software RC7000 light– visualization of the plant, datarecording, plant documentation,parametrization with the additionalsoftware RC7000 professional– optimization of the plant withRC7000 professional– registration of the RC7000 on theTEM data server– database server with the followingrange of functions:– access to the plant via DNS(e.g. access to the plant with browservia customer name.temdns.ch)– fault history– alert transmission via e-mail– access to several plants via oneaccount possible

The flue gas temperature is the importantpoint – Operational descriptionSecurity flowBoiler body with heatrecovery surfacesSelf-optimizing controlHeating flowFour-way mixer with servomotorHeating returnFan burnerBoiler circuit pumpFlue gas passes,washed by the boiler waterConnection for expansionvessel and KFE cockRefeed ofthe residual heat~ 50 – 60 °CFlue gas fanCondensate drainHeat exchanger for recoveryof the residual heatNeutralization boxwith natural granulate(no disposal required)Comparison of the flue gas losses Comparison of the energy saving Comparison of the flue gas temperatures14 %12 %10 %8 %6 %4 %2 %0 %35 %30 %25 %20 %15 %10 %5 %0 %200°C175°C150°C125°C100°C75°C50°C25°C0°Cn Old boiler, 15 – 20 yearsn Modern low-temperature boiler■ Partially condensing boiler■ Kroll BKAll indications without engagement!

Heating technoloy for genereations –a perfect heating systemThe Kroll condensing boileroperates permanently,without any restrictions,in a condensing mode allyear round.n According to the condensingtable for heating gases,vapour in waste gases of oil willcondense below approximate47°C, and in waste gases ofnatural gas the dew point isunder approximate 57°C,relating to the water/CO 2content in the respective fuel.n As at the Kroll condensingboiler the flue gas temperatureis, due to the cooling of theexhaust gases by thecombustion fresh air, alwaysunder 47/57°C, a permanentcondensation is obtainedindependently from the returntemperature of your system.nThe burner is perfectlyintegrated into the nice-lookingfront cover, which gives anadditional insulation andreduces operation noises.n The combustion gases are ledthrough two heat exchangersafter they have passed thecombustion chamber.This leads to maximum energyutilisation.n The first heat exchanger isflowed by the water of the firstheating circuit (boiler) andcools the waste gas down toabout 70°C. The second, highlyefficient tube heat exchangermade of a special plastic,is precision-manufacturedand takes most of the energycontained in the exhaust gasesby cooling them down underthe relevant dew point.This condensing procedureis followed by an additionalenergy exploitation.The recovered energy is fedto the burner as pre-heatedcombustion air.nThis is why the degree ofcondensation does notdepend on the returntemperature, but predominantlyon the outside temperature.That means, that the Krollcondensing boiler reachesits highest efficiency at thattime, when highest efficiencyis needed – in winter time –and heat is required most,under full load requirements.nBy the constantly high creationof condensate, a large part ofsulphur content, contained inthe fuel, is washed out andneutralised. This “de-sulphurisation”contributes to theprotection of our environmentand also helps to reduce thecreation of acid rain.nUp to eight Kroll condensingboilers can be run in acascade via a master control.So you can run up to 2000kW around the year underpermanent condensationwith a maximum flue gastemperature of 47 °C.Further characteristics:nSecondary heat exchangerfor heat recovery made ofspecial plastic materialn Neutralisation boxn Solar controllern The standard controller cancontrol 2 heating circuits,domestic hot water and thecirculation pump.More heating circuits can becontrolled with the additionof extra control items.n Boiler circulation pumpnHigh-quality boiler insulation n Boiler casing easy to installScope of deliveryBK20/BK30– Permanently condensing boiler,including burner (oil or gas)– Cable kit for 2-stage burner– Neutralization box, including 3 kggranulate– Control, includingExternal temperature sensorFlow sensor for heating circuit 1 (4 m)DHW sensor (4 m)Plug for pump heating circuit 1Plug for mixer heating circuit 1Plug for DHW pumpPlug for circulation pumpPlug for feeding pumpPlug for solar pumpIntegrated solar control mode(temperature difference)– Boiler connection piece for flue gaspipe LAS DN80/125(LAS = air/flue gas system)– Flue gas passes brush– Boiler body brush– 4 pieces HT elbow pieces 87°/Ø 40 mmBK50 – BK100– Permanently condensing boiler,including burner (oil or gas)– Cable kit for 2-stage burner– Neutralization box, including 3 kggranulate– Control, includingExternal temperature sensorFlow sensor for heating circuit 1 (4 m)DHW sensor (4 m)Secondary flow sensor (4 m)Plug for pump heating circuit 1Plug for mixer heating circuit 1Plug for DHW pumpPlug for circulation pumpPlug for feeding pump– Flue gas fan– Brush (flue gas passes + boiler body)– 4 pieces HT elbow pieces 87°/Ø 40 mmBK250– Permanently condensing boiler,including burner (oil or gas)– Cable kit for 2-stage burner– Neutralization box, including 9 kggranulate– Control, includingExternal temperature sensorFlow sensor for heating circuit 1 (4 m)DHW sensor (4 m)Secondary flow sensor (4 m)Plug for pump heating circuit 1Plug for mixer heating circuit 1Plug for DHW pumpPlug for circulation pumpPlug for feeding pump– Flue gas fan– Brush (flue gas passes + boiler body)– 4 pieces HT elbow pieces 87°/Ø 70 mm

Sophisticated condesing technology –Completely equippedWithout flue gas fanWith flue gas fann The boiler and combustionchamber consist of high-qualitysteel. With the specific profiledflue gas baffles you arrive at anoptimum of heat tranfer to theboiler water.The cleaning is simple and fastdue to the pivoted combustionchamber and flue gas door.n Modular and compactconstruction:The second, highly effectivetube heat exchanger made ofa special plastic, with fitted gapto enable easy flushing of theheat exchanger when servicingis carried out.Here, the bulk of the latentenergy will be extracted fromthe flue gas.As the incoming combustion airenters the heat exchanger,the flue gas will cool down underapprox. 47°C. n Heating also without flue gas fan:There are situations and siteswhere there is so little counterpressure on the chimney thatthe condensing boilers will alsowork perfectly without a flue gasfan. Therefore, Kroll offers theBK 20 and BK 30 also withoutflue gas fan.The following has to be observed:• Flue gas unit• Must be within the maximumlength according to the Krolldocumentations• Combustion air supply• Geodetical height• Must not be higher than1000 m above sea level

Large solar andstorage tank rangeKroll tube collectorn Frame collector with highlyselective SUNSELEKT cover onfull surface absorber with harpregister. Nice aluminium profileframe.n 4 connection tubes CU 18 mmfor horizontal or verticalmounting of upto 8 collectorsin raw (for more than 6,a compensator is necessary –see accessories).Possible ways to install: on the roofwithin the rooffor flat roofsfor free installationMinimum angle ofinclination 22°CMaximum angle ofinclination 65°CTested for hail-proofness upto 25 mm hailstones.Type flat collectorsAdvanced XLTotal area m 2 2,51Type horizontal storage tanks TSR150 TSR200Storage capacity Litres 150 200Continuous performance 80/45/10°C l/h – kW 610 – 25 610 – 25Type vertical storage tanks WSR150 WSR200 WSR300 WSR500Storage capacity Litres 150 200 300 500Continuous performance 80/45/10°C l/h – kW 480 – 25 480 – 31 890 – 45 1100 – 49,5Type solar storage tanks 300 500 800Storage capacity Litres 300 500 800Continuous performance 80/45/10°C l/h – kW 1600 – 25,22 1750 – 29,08 1700 – 31,46Type combined storage tanks 800 / 160 1000/200Storage capacity domestic hot water Litres 160 200Storage capacity heating water Litres 800 1000Continuous performance 80/45/10°C l/h – kW 1110 – 28 1860 – 30

Kroll GmbHPfarrgartenstrasse 46D - 71737 Kirchberg / Murrphone +49 (0) 7144 830 -200fax +49 (0) 7144 830 -201e-mail vertrieb@kroll.deweb www.kroll.dePermanently condensing boiler 06/13Technical data subject to change without noticeMore information on the Krollproduct range on: www.kroll.de