Ecocondens Crystal II Plus
ECOCONDENS CRYSTAL II PLUS gas condensing boilers are intended for heating small and large areas. Their characteristic feature is the ability to achieve a very wide range of modulation, e. g. thanks to the innovative BLUEJET burner, which allows to reduce the minimum power up to 3 kW. Stainless steel heat exchanger guarantees high energy efficiency and economical boiler operation. Control system enables comfortable remote control of the boiler by user and monitoring operation of the device by service personnel via laptop.
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Boiler Overview
- Easily convertible from COMBI to LPG by simple settings change
- heat exchanger made of stainless steel
- wide range of modulation: from 11% to 100%
- high efficiency circulation pump
- stepless speed regulation fan (controlled electronically)
- cylinder burner made of stainless steel – low level of NOx emission (6th class)
- domestic hot water cylinder by 3-way valve (refers to system boilers)
- complete protection system
- optimization of boiler operation is possible due to application of:
- outdoor temperature sensor
- temperature regulator: ON/OFF, Open-Therm or 0-10V,
- ROUND system for remote boiler control via smartphone,
- EVOHOME system for remote control of up to 11 heating zones
- ready-to-use multi-zone modules for controlling up to 3 SIM heating systems
- boilers can also cooperate with:
- heat pumps air/water
- solar panels

SPECS
Thermal power (at temp. 80/60°C) | 2,7-20,0 kW |
Thermal power (at temp. 50/30°C) | 3,0-22,0 kW |
Heat load | 2,8-20,4 kW |
Seasonal space heating energy efficiency ηs | 94 % |
Efficiency of the boiler at nominal load and average boiler water temperature of 70°C | 97,6 % |
Efficiency of the boiler at partial load and return water temperature of 30°C | 107,9 % |
Seasonal space heating energy efficiency class | A |
Useful heat output at rated thermal power P4 (for modulated boilers – arithmetic mean of min and max) | 20,0 kW |
Useful heat output at 30% of rated power P1 (for modulated boilers – 30% of arithmetic mean) | 6,0 kW |
Efficiency η4 | 88,0 % |
Efficiency η1 | 97,0 % |
Max water pressure | 3 bar |
Max CH temperature | 95 °C |
Standard adjustable temperature | 20-80 °C |
Pump head at 0 flow | 0,7 bar |
Nominal boiler thermal power (at temperature 80/60°C) | 2,7-25 kW |
Nominal heat load | 2,8-25,6 kW |
Efficiency of the boiler at nominal load and average boiler water temperature of 70°C | 97,6 % |
Water pressure | 0,1-6 bar |
Minimal water flow | 2,0 dm³/min |
Domestic water flow at Δt=30K | 12,0 dm³/min |
Energy efficiency class of water heating | A |
Load profile | L |
Range of water temperature regulation | 30-60 °C |
Sound power level LWA | 48 dB |
Emission of nitrogen dioxide | 21 mg/kWh |
Emission class of nitrogen dioxide (NOx) | 6 |
Expansion vessel capacity | 6 dm³ |
Standby mode power consumption PSB | 0,005 kW |
Electricity consumption at full load elmax | 0,05 kW |
Electricity consumption at partial load elmax | 0,02 kW |
Type and supply voltage | ~230-10%/50Hz V |
Protection degree | IPX4D |
Heating water and gas connection | G3/4 inch |
Dimensions | 777x400x285 mm |
Weight | 33 kg |
Domestic water connection | G1/2 inch |
Heat exchanger material | Stainless Steel |
Thermal power (at temp. 80/60°C) | 3,9-24,0 kW |
Thermal power (at temp. 50/30°C) | 4,3-26,5 kW |
Heat load | 4,0-24,6 kW |
Seasonal space heating energy efficiency ηs | 94 % |
Efficiency of the boiler at nominal load and average boiler water temperature of 70°C | 98 % |
Efficiency of the boiler at partial load and return water temperature of 30°C | 108,7 % |
Seasonal space heating energy efficiency class | A |
Useful heat output at rated thermal power P4 (for modulated boilers – arithmetic mean of min and max) | 24,0 kW |
Useful heat output at 30% of rated power P1 (for modulated boilers – 30% of arithmetic mean) | 7,2 kW |
Efficiency η4 | 87,9 % |
Efficiency η1 | 96,9 % |
Max water pressure | 3 bar |
Max CH temperature | 95 °C |
Standard adjustable temperature | 20-80 °C |
Pump head at 0 flow | 0,7 bar |
Nominal boiler thermal power (at temperature 80/60°C) | 3,9-30,0 kW |
Nominal heat load | 4,0-30,7 kW |
Efficiency of the boiler at nominal load and average boiler water temperature of 70°C | 98 % |
Water pressure | 0,1-6 bar |
Minimal water flow | 2,0 dm³/min |
Domestic water flow at Δt=30K | 14,0 dm³/min |
Energy efficiency class of water heating | A |
Load profile | XL |
Range of water temperature regulation | 30-60 °C |
Sound power level LWA | 48 dB |
Emission of nitrogen dioxide | 24 mg/kWh |
Emission class of nitrogen dioxide (NOx) | 6 |
Expansion vessel capacity | 6 dm³ |
Standby mode power consumption PSB | 0,005 kW |
Electricity consumption at full load elmax | 0,05 kW |
Electricity consumption at partial load elmax | 0,02 kW |
Type and supply voltage | ~230-10%/50Hz V |
Protection degree | IPX4D |
Heating water and gas connection | G3/4 inch |
Dimensions | 777x400x285 mm |
Weight | 34 kg |
Domestic water connection | G1/2 inch |
Heat exchanger material | stainless steel |
Rated output range | 35 kW |
Thermal power (at temp. 80/60°C) | 4,1-34,7 kW |
Thermal power (at temp. 50/30°C) | 4,5-38,2 kW |
Heat load | 4,2-35,6 kW |
Seasonal space heating energy efficiency ηs | 94 % |
Efficiency of the boiler at nominal load and average boiler water temperature of 70°C | 98 % |
Efficiency of the boiler at partial load and return water temperature of 30°C | 109,0 % |
Seasonal space heating energy efficiency class | A |
Useful heat output at rated thermal power P4 (for modulated boilers – arithmetic mean of min and max) | 34,7 kW |
Useful heat output at 30% of rated power P1 (for modulated boilers – 30% of arithmetic mean) | 10,4 kW |
Efficiency η4 | 87,8 % |
Efficiency η1 | 96,5 % |
Max water pressure | 3 bar |
Max CH temperature | 95 °C |
Standard adjustable temperature | 20-80 °C |
Pump head at 0 flow | 0,7 bar |
Nominal boiler thermal power (at temperature 80/60°C) | 4,1-40,0 kW |
Nominal heat load | 4,2-41,0 kW |
Efficiency of the boiler at nominal load and average boiler water temperature of 70°C | 98 % |
Water pressure | 0,1-6 bar |
Minimal water flow | 2,0 dm³/min |
Domestic water flow at Δt=30K | 19,0 dm³/min |
Energy efficiency class of water heating | A |
Load profile | XL |
Range of water temperature regulation | 30-60 °C |
Sound power level LWA | 48 dB |
Emission of nitrogen dioxide | 29 mg/kWh |
Emission class of nitrogen dioxide (NOx) | 6 |
Expansion vessel capacity | 6 dm³ |
Standby mode power consumption PSB | 0,005 kW |
Electricity consumption at full load elmax | 0,05 kW |
Electricity consumption at partial load elmax | 0,02 kW |
Type and supply voltage | ~230-10%/50Hz V |
Protection degree | IPX4D |
Heating water and gas connection | G3/4 inch |
Dimensions | 777x400x285 mm |
Weight | 37,0 kg |
Domestic water connection | G1/2 inch |
Heat Exchanger Material | Stainless Steel |

The mobile App Comfort Version and the mobile app Service Version diagram show just how easy it is for you to connect to and control your boiler and heating system, monitor the operation of the boiler against the service parameters and diagnose any error codes.
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