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KORAL

Eco-pea coal boiler with proven structure

KORAL is a modern eco-pea coal boiler with feeder, which is characterized by ease of use. The design solutions of the boiler refer to the highly rated MERKURY boilers by Zębiec. The boiler operation is controlled by a modern ELSTER controller with the possibility of controlling 4 pumps, a mixing valve, and as an additional option it features several independent heating circuits or an Internet module.

Up to 95.5% – high thermal efficiency

The PID algorithm used in the controller automatically regulates the amount of fuel fed and the blow-in power. Such control ensures more economical, more efficient and cleaner combustion.

Modern solutions

The boilers utilise a system preventing backflow of smoke into the feed hopper. It is possible to set a programme in the controller for disinfection of the domestic hot water tank. To increase the convenience of use, the boiler can be purchased with the right or left hand side feeder.

Ecological pea heating

The boilers meet stringent requirements of the Class 5 and Ecodesign in terms of clean exhaust, which means that KORAL boilers by ZĘBIEC meet the conditions for obtaining funding under the CLEAN AIR (CZYSTE POWIETRZE) programme.

WHERE TO BUY

Bin drying system

6 years warranty of watertightness of the welded joints of the water body

60 months warranty of watertightness of the water body

24 months warranty of efficient boiler operation

Automatic boiler operation

High thermal efficiency reaching 94.6%

Low level of harmful substances in exhaust gases

Ceramic chamber of the boiler

Mechanical fuel supply

Increased safety of use owing to application of sensors

Screw movement sensor

Certified P265GH boiler sheets

As an additional option

Boiler control via the Internet

Controlling the boiler using a room panel

ekogroszek
Pea coal type II 31.2 (8-20mm)
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LIDER PID DYNAMIC controller

The boiler operation is controlled by a modern LIDER PID DYNAMIC controller with the feature of controlling 4 pumps, a three- or four-way mixing valve. And several independent heating circuits, controlling via room panel and Internet, weather-based controlling etc.

Additional equipment

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ROOMSTER RTx room controller

Roomster is designed to stabilise the room temperature.
It features home temperature programme with a measurement accuracy of 0,1°C.
Thanks to the built-in two-way communication, messages on alarm conditions from the boiler and measured temperatures are displayed.
The main features of the Roomster RTx controller are:

  • wireless communication with the boiler
  • controlling temperature in the room
  • weekly preset temperature programme
  • displaying current temperatures from the boiler and system
  • displaying boiler and system alarm states
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ETH 100 Internet module

The device allows remote control of the heating system by the user with:

  • editing of boiler preset temperatures and heating circuits
  • editing of domestic hot water parameters
  • overview of the ongoing boiler operation and temperatures
  • overview of parameters set on the controller

The history of recorded measurements is also available, i.e.:

  • boiler coat temperature
  • domestic hot water temperature
  • outside temperature
  • calculated fuel consumption for the boiler
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LIDER RTx wireless communication module with housekeeper feature

Installing the wireless communication module allows the controller on the boiler to be moved from the boiler room into the apartment and full operation of the boiler settings and installation. In addition, it can function as a room controller with the feature of room temperature measurement. Very easy installation without the need for an installer.

koral rysunek techniczny

BOILER Height [mm] Width [mm] Depth [mm] A [mm] B [mm] C [mm] D [mm] E [mm] F [mm] G [mm]
KORAL 10 1222 1040 728 156 972 1050 159 430 743
KORAL 14 1342 1190 888 156 1095 1174 159 516 883 1258
KORAL 18 1412 1190 888 156 1165 1244 159 516 883 1328
KORAL 22 1487 1190 888 156 1239 1324 159 516 883 1402
KORAL 25 1557 1190 888 156 1309 1394 159 516 883 1472
Identification J.m. KORAL 10 KORAL 14 KORAL 18 KORAL 22 KORAL 25
Energy efficiency class B B B B B
Rated thermal power kW 10 14 18 22 25
Energy efficiency ratio 86 85 85 86 85
Scope of work kW 3,0-10 4,2-14 5,4-18 6,6-22 7,5-25
Thermal efficiency % up to 95,5 up to 94,6 up to 92,8 up to 94,0 up to 94,1
Feed hopper capacity* dm3/kg 120/95 166/133 188/150 211/169 233/186
Boiler water capacity dm3 42 80 83 93 99
Min. required natural draught Pa 20 20 20 25 25
Min. height of the chimney m 5 5 5 7,5 7,5
Min. cross section of the chimney cm x cm Φ cm 20 x 14 Φ 18 20 x 14 Φ 18 20 x 14 Φ 18 20 x 14 Φ 18 20 x 14 Φ 18
Flue diameter mm Φ 159 Φ 159 Φ 159 Φ 159 Φ 159
Water pipes outlet/return (internal threaded) mm G 1 1/2″ internal G 1 1/2″ internal G 1 1/2″ internal G 1 1/2″ internal G 1 1/2″ internal
Max. working pressure bar 1,5 1,5 1,5 1,5 1,5
Boiler weight without water kg 257 450 470 510 525
Boiler class according to 303-5:2018 5 5 5 5 5
Ecodesign yes yes yes yes yes

* For reference only; depends on bulk density, calorific value, fuel grade, etc.

Boilers „Zębiec” Thermal power Room area [m2] depending on the building’s penetration coefficient (insulation)
U > 1 [W/m2K] U ~ 0,7 [W/m2K] U ~ 0,5 [W/m2K] U ~ 0,3 [W/m2K]
without insulation ~5 cm styrofoam ~8 cm styrofoam ~10 cm styrofoam
KORAL 10 10 86 100 120 155
KORAL 14 14 120 140 165 215
KORAL 18 18 155 180 210 275
KORAL 22 22 195 220 260 340
KORAL 25 25 215 250 295 385
kocioł ekogroszek koral