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Polski Producent KotłówPolish manufacturer
D E F R O *
360 Defro

Optima Komfort Plus NZ

Availability: Discontinued
Boiler type: fill opening
Available powers: 12, 15, 20, 25, 30, 35 kW
Controller: S3P with support for 2 pumps (central heating and domestic hot water) and a PID algorithm to maintain a constant boiler temperature. Adjustable control panel position.
Standard equipment: S3P controller (standard ST-28 OPTI with PID for 8KW), built-in cooling coil, safety fittings, reinforced construction.
Optional equipment - for an additional fee: K3P controller with support for a mixing valve, DEFRO MZ mixing valve controller with a weather sensor and return protection, GSM module*, and internet module.
Polish product, manufactured within the European Union. Polish product, manufactured within the European Union.

4 years of warranty for the heat exchanger's tightness, 2 years for other components, and the boiler's proper functioning.

Heat exchanger made of certified, high-grade boiler steel.

High thermal efficiency reaching 85% thanks to increased heat recovery from exhaust gases.

Boiler designed for installation in a closed system, in the OPTIMA COMFORT PLUS NZ version.

Large combustion chamber.

Multipoint system for delivering air to the fuel loading zone.

Water grate.

Door closing force adjustment.

PID control - boiler operation regulation based on exhaust gas temperature.

A manually loaded boiler in which the fuel combustion process is electronically controlled based on the exhaust gas temperature. The controller also regulates the operation of the central heating pump and the domestic hot water pump. Air for the fuel combustion process is forced by a blower fan using a multipoint direct feed system into the fuel combustion zone, significantly improving the process parameters.
The high efficiency of the device is ensured by the proven heat exchanger design with horizontal flue gas passages, and a fixed water grate that accelerates the heat uptake from the combustion chamber.
Efficient fuel loading is facilitated by a large, slanted loading opening, and the device’s extended working hours are made possible by a capacious loading chamber.

The NZ version with a reinforced construction, built-in cooling coil, and complete safety fittings allows for installation in a closed system. The NZ version is subject to an additional fee as per the Boiler Equipment Price List.

(*) – additional paid option, installed upon customer’s request.

Nominal power. kW 12 15 20 25 30 35
Minimal power. kW 3,6 4,5 6,0 7,5 9,0 10,5
Power range kW 3,6-12 4,5-15 6,0-20 7,5-25 9,0-30 10,5-35
Energy efficiency class D D D D D D
Heated area*. m2 Up to 120 Up to 150 Up to 200 Up to 250 Up to 300 Up to 350
Single fuel load. kg ~21 ~30 ~41 ~51 ~65 ~75
Fuel consumption**. kg/h 1,8 2,2 2,9 3,7 4,4 5,1
Optimum thermal efficiency % 85,0-85,8
Max. permissible working pressure % 2,5
Required exhaust gas draft Pa 22 23 26 28 30 31
Exhaust gas temperature for nominal power °C 197-248
Flue gas mass flow for nominal power. g/s 8,5 10,4 11,6 15,4 18,5 20,8
Water temperature at supply min./max. °C 65/85
Water temperature at return min. °C 55
Temperature adjustment range °C 45-85
Chimney dimensions. cm x cm 14×14 14×14 14×14 16×16 17×17 18×18
Chimney dimensions. Ø mm 160 160 160 180 190 200
Minimum height of the chimney m 6 6 7 7 8 8
Heating surface m2 1,7 2,1 2,5 2,8 3,4 3,8
Boiler water capacity l 67 77 92 104 121 141
Boiler weight *****. kg 282 315 352 400 466 494
Width mm 616 666 666 716 816 816
Maximum depth. mm 875 875 945 975 975 1045
Maximum height***. mm 1350 1400 1460 1460 1460 1460
Loading opening dimensions. mm 258×188 258×188 308×188 358×188 458×188 458×188
Diameter of supply and return connections. 1½”
Drain port diameter ½”
Power supply V/Hz ~230V/50Hz
Maximum power consumption. W 44
Operating pressure of the coil min/max****. bar 2/6

 

 

*The maximum heated area has been estimated for an individual heat demand of q = 80 W/m².
**Fuel consumption for anthracite coal with a heating value of 28,997±300 kJ/kg.
***The height of the OPTIMA KOMFORT PLUS NZ boiler can be further adjusted using the included feet. The feet have an adjustment range of 28-40mm.
****In case of higher pressure, use a pressure reducer.

*****The weight of the boiler depends on the equipment.

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