Condensing gas boiler MCR4 24/35 BIC with integrated DHW heater. 7857050

Condensing boiler with integrated DHW heater

Wall-mounted gas boiler with a built-in 45 liter stainless steel DHW tank equipped with an exchanger coil. This tank does not require an external heater – the installation is compact, and hot water preparation takes place directly within the boiler, without additional components.

The air-gas module allows for power modulation from 10% to 100%, enabling precise power adjustment to current demand. The non-return valve allows operation with C43p pressure flue gas discharge systems – ideal for modern installations with forced ventilation. The Ø60/100 mm air-flue connection is supplied as standard, and the boiler is homologated for connection to both a chimney (B23p, C93) and to distribution (C53) or collector (C43P) systems.

The stainless steel toroidal heat exchanger – covered by a 5-year warranty – ensures durability and high efficiency. Efficiency at full load reaches up to 105.8%, and nitrogen oxide emissions are below 21 mg/kWh, corresponding to the highest ecological class.

Control system and gas adaptation

The boiler is equipped with the Gas Adaptive System – an electronic system that automatically adjusts combustion parameters to the type of gas: E, Lw, Ls, or propane/butane. When operating on Ls gas, an additional conversion kit is required – there are no technical limitations, only the necessity for proper configuration.

Control is managed via the E-Pilot console with an intuitive interface and weather compensation function. An AF60 outdoor temperature sensor is required for operation (available as an accessory). It is possible to connect a Smart TC modulating thermostat, which enables remote control via smartphone or tablet – the application works on Android and iOS and signals faults in real time.

Hydraulic design and safety

The brass hydraulic module contains an A-class modulated pump with an energy efficiency index EEI < 0.23 – which is the highest available class for pumps in this category. The diverter valve between the heating and DHW circuits is mounted on the supply side – minimizing heat loss and ensuring rapid response.

Safety features:

• safety valve for the heating circuit at 3 bar
• safety valve for the DHW circuit at 8 bar

Expansion vessels:

• 10 liters for the heating circuit
• 2 liters for the DHW circuit

Additionally, the SCB-17B board is available, which allows for direct integration and management of an additional heating circuit without the need to install an external controller.

Future-proofing

The boiler is designed to operate with gas containing up to 20% hydrogen blend – requiring no modifications when switching to more ecological fuel. This is not just a solution for today, but an investment for the coming years.