CITY Class K 25-35 kW
City Class 25 KR gas boilers
Product description
Innovative design
Excellent construction quality
Leading combustion technology
Thermal comfort with maximum economy
Features
- Stainless steel plate heat exchanger
for abundant hot water
- Electric three-way switching valve
- Automatic bypass
- Flow sensor
- Pressure relief valve 3 bar
- Low pressure piezostat
- Use water sensor NTC sensor
- Filter at the entrance of the new
use and filling routine
- Filling switch
- Pressure indicator pressure gauge
- Hydraulic connections according to DIN
Technical characteristics
Additional information
Technical characteristics
| Model | City Class 25 K | City Class 30 K | City Class 35 K |
City Class 25 KR |
City Class 35 KR |
|
|---|---|---|---|---|---|---|
| Gas type | G20 | G20 | G20 | G20 | G20 | |
| CE certification | 0476CS1134 | 0476CS1134 | 0476CS1134 | 0476CS1134 | ||
| Maximum charging power Qn 60°/80°C * | kW | 25 | 30 | 33.2 | 25 | 33,2 |
| Maximum heating charging power | kW | 20 | 24 | 28 | 20,0 | 28,0 |
| Maximum/minimum effective power 60°/80°C | kW | 19.4/2.4 | 23.3/2.8 | 27.4/3.3 | 19,4/2,4 | 27,4/3,3 |
| Maximum/minimum effective power 30°/50°C | kW | 21.0/2.7 | 25.2/3.1 | 29.5/3.7 | 21,0/2,7 | 29,5/3,7 |
| NOX class | 5 | 5 | 5 | 5 | 5 | |
| PERFORMANCE | ||||||
| Rated efficiency at 60°/80°C * | % | 96.1 | 96.0 | 96,2 | 96.1 | 96,2 |
| Rated output at 30°/50°C * | % | 105.1 | 105.2 | 106,4 | 105.1 | 106,4 |
| Performance at 30% of total power at 30/50°C | % | 106,4 | 106.0 | 106,7 | 106,4 | 106,7 |
| WARMING | ||||||
| Adjustment temperature range (min÷max) high temperature / low temperature |
°C | 35÷80 / 20÷45 | 35÷80 / 20÷45 | 35÷80 / 20÷45 | 35÷80 / 20÷45 | 35÷80 / 20÷45 |
| Expansion tank | l | 8 | 8 | 10 | 8 | 10 |
| Expansion vessel precharge | cash | 1 | 1 | 1 | 1 | 1 |
| Maximum operating pressure | cash | 3 | 3 | 3 | 3 | 3 |
| Maximum temperature | °C | 90 | 90 | 90 | 90 | 90 |
| Anti-freeze temperature on/off | °C | 5 / 30 | 5 / 30 | 5 / 30 | 5 / 30 | 5 / 30 |
| HOT WATER FOR USE | ||||||
| Supply for temperature rise 25°C | l/min | 14.8 | 17.2 | 18,7 | – | – |
| Supply for temperature rise 30°C | l/min | 12.0 | 14.0 | 16.0 | – | – |
| Minimum water supply (for activating the DHW function) | l/min | 2.8 | 2.8 | 2.8 | – | – |
| Minimum water pressure (to activate the DHW function) | cash | 0.2 | 0.2 | 0.2 | – | – |
| Maximum water inlet pressure | cash | 6 | 6 | 6 | 6 | 6 |
| DHW control temperature range (min÷max) | °C | 30÷55 | 30÷55 | 30÷55 | ||
| ELECTRICAL COMPONENTS | ||||||
| Voltage/Frequency (nominal voltage) | V/Hz | 220+240/50 (230V) | ||||
| Protection level | IPX5D | IPX5D | IPX5D | IPX5D | IPX5D | |
| DIMENSIONS | ||||||
| Width - Height - Depth | mm | 400X700X300 | ||||
| Weight | kg | 27,5 | 30 | 31,5 | 27.5 | 31.5 |
| DIMENSIONS | ||||||
| Coaxial system (Φ60/100mm (inlet/outlet), maximum length | m | 12 | 10 | 8 | 10 | 8 |
| Separation system Φ80mm (inlet/outlet), maximum length | m | 54 | 54 | 50 | 52 | 52 |
| ERP data | ||||||
| Declared profile of hot water for use | XL | XL | XXL | – | – | |
| Seasonal heating energy efficiency category | A | A | A | A | A | |
| Energy efficiency category of domestic hot water | A | A | A | – | – | |
| Seasonal heating energy efficiency grade | (ns) % | 91 | 91 | 91 | 91 | 91 |
Additional information
Condensing boiler CITY CLASS K from 25 to 35 kW
 | Innovative design Excellent construction quality Leading combustion technology Thermal comfort with maximum economy |
Compact construction
Performance, Reliability, Economy
Clean combustion means minimal pollutants and a clean environment. But clean combustion also means saving fuel. That is why all CITY CLASS boilers are equipped with the Intelligent Combustion System (ICS) with automatic power graduation 1:10. This system constantly monitors the combustion quality and coordinates the electronic gas valve and the inverter fan, so that the ideal air/gas combustion ratio is always achieved and ensures perfect clean combustion in all operating conditions.
The CITY CLASS is an extremely efficient condensing gas boiler, offering :
 |
|
Also, the smart gas valve CITY CLASS boiler can operate with all types of gas (natural gas, propane, etc.) without the need to change the boiler.
The heart of the system
The company ITALTHERM has equipped the CITY CLASS boilers with the leading new generation of high efficiency combustion chambers that he has developed and designed.
This innovative combustion chamber consists of a single coil of stainless steel pipebut with 4 times bigger internal water circulation cross-section
This design ensures low internal flow friction while the water velocity remains high, thus eliminating the formation of deposits, while the clean surface ensures the optimal heat transfer and longevity of the boiler.
In addition the single construction without connections, excludes any possibility of leakage
Due to this innovative design, the CITY CLASS boilers are the ideal solution for ideal solution for new installations but also for boiler replacement in old heating installations.
Finally, the possibility of easy access to the entire interior of the flame chamber ensures easy cleaning and quick maintenance
Quality construction for safety and efficiency
The company ITALTHERM chooses to use in City Class boilers Brass Hydraulic System, for maximum reliability, robustness and high resistance to corrosion and low temperatures.
All City Class boilers are equipped with anti-freezing protection in both the heating and hot water functions, which is activated if the boiler temperature drops below +5°C.
In addition, during periods of inactivity, the anti-blocking function of the circulator and the electric three-way valve is activated, ensuring immediate response to any request for their operation.
The new Brass Hydraulic System also includes:
- High efficiency circulator Grundfos inverter 7m
- Stainless steel plate heat exchanger for abundant hot water
- Electric three-way switching valve
- Automatic bypass
- Flow sensor
- Pressure relief valve 3 bar
- Low pressure piezostat
- Use water sensor NTC sensor
- Filter at the inlet of the use and filling water
- Filling switch
- Pressure indicator pressure gauge
- Hydraulic connections according to DIN
Brochure:
