Indirectly fired Fast Horizontal Boiler Tank CAWT-500L Duplex 2205 500Liter with coil (Spiral) For heat pump

CAWT-500L Fast Boiler Tank – Indirectly Fired Stainless Steel Boiler 500 Liter with Spiral, Specially for Heat Pumps

The CAWT-500L Fast Boilertank is a powerful, high-quality and future-oriented solution for modern heating systems where sustainability, reliability and hot water comfort are central. This 500 liter horizontal boiler is equipped with an efficient spiral heat exchanger and is made entirely of Duplex 2205 stainless steel - an alloy that excels in strength, corrosion resistance and thermal stability.

Specially developed for combination with heat pumps and other renewable energy sources, this boiler ensures fast, efficient and stable hot water storage. Thanks to the indirect heating principle via the integrated spiral tube (coil), heat is optimally transferred, even at low supply temperatures, as is typical for heat pump systems.

The tank is equipped with a high-quality PUR hard foam insulation layer with a thickness of 50 mm, which minimizes heat losses and ensures energy-efficient operation. Due to the horizontal design , the CAWT-500L is particularly suitable for technical rooms with limited height or for situations where vertical installation is not possible.

With a robust design, multiple connection options and a long service life, this boiler is the ideal choice for professional installations in homes, apartment complexes, commercial buildings and agricultural applications.

✅ Key benefits:

• 500 liter net capacity – suitable for high hot water demand or as a buffer tank

• Duplex 2205 stainless steel – corrosion-resistant, pressure-resistant and suitable for drinking water

• Integrated spiral heat exchanger (coil) – high transfer efficiency

• Specially designed for heat pumps – also suitable for solar boilers or hybrid systems

• High-quality PUR insulation (50 mm) – very low standstill losses

• Horizontal design – installation possible in low technical areas

• Multiple connection options (top/side) – easy to integrate into any system

• Long-term reliability – resistant to condensation and temperature changes

⚙️ Technical specifications (summarized):

• Gross volume: 500 liters

• Material tank & coil: Duplex 2205 stainless steel

• Insulation: PUR hard foam, 50 mm

• Maximum working pressure tank: 10 bar

• Maximum working pressure heat exchanger: 16 bar

• Maximum tank temperature: 95 °C

• Spiral surface: 2.9 m²

• Heat exchanger capacity at 80/10/45°C: approx. 34.4 kW

• Dimensions (LxW): ± 1975 x 650 mm

• Connections: multiple (G 1¼”, G 1”, sensor inputs)

• Air/water and ground/water heat pumps

• Solar boiler systems

• Hybrid heating systems

• Residential construction (detached, apartments, villas)

• Utility construction (schools, offices, sports complexes)

• Agricultural installations or industrial applications

The CAWT-500L Fast Boilertank from Coolmark is designed for the installer who does not compromise on quality, durability and performance. The combination of high-quality Duplex steel , smart construction and optimized heat transfer makes this boiler the reliable core of any sustainable hot water system.