Indirectly fired Fast boiler and buffer tank in 1 (housing) CDWT-300L Duplex 2205 Boiler tank 200L, Buffer tank 100 liter, with coil (spiral) Heat pump boiler

CDWT-300L – Fast Boiler Tank & Buffer Tank in one housing – 300 Liter (200L + 100L), Duplex 2205 Stainless Steel, with Spiral for Heat Pump

The Coolmark CDWT-300L Fast Boiler & Buffer Tank Combination is a compact 2-in-1 boiler solution, specifically designed for the latest generation of heat pump systems. This unit combines a 200-liter boiler tank and a 100-liter buffer tank in a single, robust stainless steel housing, resulting in a space-saving and efficient total solution for hot water and heating.

The tank is made of Duplex 2205 stainless steel , a high-quality material known for its extreme corrosion resistance, strength, and hygienic properties. This makes the boiler suitable for both drinking water systems and low-temperature heating in combination with heat pumps, solar water heaters, and hybrid systems.

At the heart of the design is a powerful spiral heat exchanger (coil) with a surface area of ​​2.1 m². Optimized for low supply temperatures, such as those found in air-to-water heat pumps, this coil ensures fast, efficient transfer of thermal energy to domestic hot water.

The entire unit is fully insulated with 50 mm rigid PUR foam with excellent insulation values, significantly reducing heat loss and minimizing energy consumption. Thanks to its well-thought-out design and versatile connection options, this boiler is easy to integrate into both new installations and renovation projects.

Key Benefits:

• 2-in-1: 200L boiler tank + 100L buffer tank in one compact housing

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

• Efficient spiral heat exchanger: 2.1 m² surface area, high transfer capacity

• Optimized for heat pumps: maximum efficiency at low temperatures

• 50 mm PUR insulation: excellent thermal protection, minimal heat loss

• Compact design: space-saving and easy to install

• Multiple connection options: flexible integration into any system

Technical specifications (summary):

• Total volume: 300 liters

• Boiler tank: 200 liters

• Buffer tank: 100 liters

• Tank material: Duplex 2205 stainless steel

• Insulation: 50 mm PUR hard foam

• Spiral surface: 2.1 m²

• Heat exchanger capacity at 80/10/45 °C: approx. 21.9 kW

• Max. working pressure tank: 10 bar

• Max. working pressure spiral: 16 bar

• Max. tank temperature: 95 °C

• Dimensions (h x Ø): 1500 x 650 mm

• Connections: G 1¼", G 1", temperature sensor inputs

Applications:

• Heat pump systems (air/water & ground/water)

• Solar boiler and buffer tank combinations

• Hybrid heating systems

• Residential construction, apartments, commercial construction

• Renovations, technical rooms with limited space

The CDWT-300L is designed for installers who don't want to compromise on quality, performance, or efficiency. Thanks to the combination of high-quality stainless steel, an advanced spiral heat exchanger, and smart insulation, this boiler-buffer tank combination offers a sustainable solution for modern installations with a minimal environmental footprint.