For larger buildings
Output for larger buildings
With an output of up to 49.2 kW, ATTACK Condensing KT 48 is designed for apartment blocks, businesses and larger buildings. A separate DHW tank can be connected to the boiler.
30 years of development and manufacturing
ATTACK Condensing KT 48 gas condensing boiler
Wall-mounted condensing boiler for larger buildings.
Condensing boiler with an output of up to 49.2 kW and the option to connect an external domestic hot water tank. The manufacturer lists larger buildings and apartment blocks as suitable uses.
Category: Gas boilers
49.2 kWmaximum output
1:10modulation range
109.2%stated efficiency
H₂ Readymanufacturer designation
Discover ATTACK Condensing gas boilers
Condensing performance for larger buildings
A model with 49.2 kW output and the option to connect an external DHW tank.
Gas
Boiler connection
A condensing gas boiler needs a connection to natural gas. ATTACK Condensing KT 48 supports both G20 natural gas and G31 propane. Fuel conversion and adjustment must be carried out by an ATTACK service technician.
Benefits
Why choose a condensing boiler?
Why choose a gas boiler?
The initial cost is low compared with biomass boilers or heat pumps. Gas boilers are among the more affordable heating options and require little maintenance.
Fuel
H₂ Ready
The manufacturer labels ATTACK Condensing KT 48 as H₂ Ready. The available documentation for this model does not specify a hydrogen blend percentage.
Higher heating output
Wall-mounted boiler for higher heating demands
KT 48 is designed for apartment blocks, businesses and larger buildings. The manufacturer lists connection to an external DHW tank and control based on outdoor temperature as available options.Technical features of ATTACK Condensing KT 48
Discover the ATTACK Condensing KT 48 condensing boiler
Explore the intelligent combustion system, stainless-steel heat exchanger, quality hydraulic assembly and features that protect the boiler and tank.
ISC
Intelligent combustion system
The intelligent combustion system regulates combustion and adjusts settings such as gas flow to maintain the correct air-to-gas ratio.
- Reduced gas consumption
- Lower CO₂ emissions
- Less time needed to install and set up the boiler
- Modulation range of 1:10
- Fewer on/off cycles
- Longer boiler service life
Heat exchanger
Stainless-steel heat exchanger
ATTACK Condensing KT uses a stainless-steel heat exchanger with extra-wide channels, whose cross-section is up to four times larger than that of standard exchangers. This supports efficient heat transfer and helps resist the build-up of dirt. It is also a suitable option when replacing a boiler in an existing heating system.
Hydraulic assembly
Quality components
The new brass hydraulic assembly is equipped with:
- A high-efficiency pump
- A three-way valve
- A bypass
- A flow regulator with a filter
- A drain valve
- A domestic hot water temperature sensor
Protection
Frost protection
Frost protection keeps your boiler protected on cold days. If it remains connected to the gas and electricity supplies, the burner starts automatically and the pump switches on when the temperature falls below 6 °C. This function helps protect the boiler and extend its service life.
Water protection
Bacteria protection
The Anti-Legionella function automatically heats the water in the DHW tank at regular intervals. At least once a week, it heats the water to 65 °C, regardless of the thermostat setting. Legionella bacteria thrive in water at 25–55 °C, while heating it above 60 °C destroys them, so this function helps reduce the risk of their growth.
ATTACK Condensing KT 48 gas boiler options
Enjoy even greater comfort
Explore cascade connection and mobile control options for the gas boiler.
01
Cascade connection option
Can be connected in a cascade
ATTACK Condensing KT boilers are designed to support cascade connections of up to four boilers. A cascade controller, available as an accessory, is required. The cascade controller intelligently manages the connected boilers and gives you full control of the system.
02
OpenTherm control
OpenTherm control (optional accessory)
OpenTherm control does more than switch the boiler on. It compares the actual room temperature with the set temperature, allowing the boiler output to respond to the heating demand. OpenTherm control helps lower consumption, maintain a steadier temperature and improve comfort.
03
SMART control
Smart remote control
Optional accessories include the OT80 OpenTherm room thermostat and OT81 Wi-Fi modem. Together with the ATTACK Condens mobile app, they let you control the boiler remotely.
Detailed specifications
Technical data
The temporary database lists dimensions of 450 × 837 × 457 mm; the current product page lists a depth of 475 mm. The table keeps the database value and flags the difference for verification.
| Parameter | Unit | KT 48 |
|---|---|---|
| Maximum central-heating heat input | kW | 47.5 |
| Minimum central-heating heat input | kW | 5 |
| Maximum central-heating output (50/30 °C) / (80/60 °C) | kW | 49.2/46 |
| Minimum central-heating output (80/60 °C) | kW | 4.7 |
| G20 gas pressure | mbar | 20 |
| G31 gas pressure | mbar | 37 |
| NOx emissions class | — | 6 |
| Water capacity in boiler (central heating) | l | 3.5 |
| Maximum/minimum heating operating pressure | bar | 3/1 |
| Heating energy class | — | A |
| Ingress protection rating | — | IP X5D |
| Supply voltage | V/Hz | 240/50 |
| Electrical power consumption | W | 145 |
| Boiler weight without water | kg | 38.8 |
| Dimensions (W × H × D) | mm | 450 × 837 × 457 |
Product materials
Download documents
ATTACK Condensing KT 48/65/85/110/150 operating manual
PDF · Slovak
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OT80 thermostat operating manual
PDF · Slovak / English
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OT81 Wi-Fi modem operating manual
PDF · Slovak / English
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ATTACK Condensing KT 48 energy label
PDF · Slovak
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ATTACK Condensing KT declaration of conformity
PDF · Slovak
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Technical data
PDF
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Videos
Take a closer look at the boiler
Customer support
Choosing and installation support
ATTACK service partners can help design, install and maintain the heating system. Ask an expert to assess whether the boiler and chimney are suitable.
Service supportNeed advice?
Is ATTACK Condensing KT 48 suitable for your building?
An expert can help assess boiler output, controls and connection to an external tank.