Indirectly fired Fast boiler and buffer tank in 1 (housing) CDWT-215L Duplex 2205 Boiler tank 150 liters, Buffer tank 65 liters, with coil (spiral) Heat pump boiler

CDWT-215L – Fast Boiler Tank & Buffer Tank in one housing – 215 Liter (150L + 65L), Duplex 2205 Stainless Steel, with Spiral Heat Exchanger for Heat Pump

The Coolmark CDWT-215L Fast Boiler and Buffer Tank is a compact 2-in-1 total solution for installations where energy efficiency, space saving and high performance are essential. With a capacity of 150 litres for domestic hot water and 65 litres of buffer volume for low-temperature heating, this unit is perfectly suited for applications with heat pumps, solar energy or hybrid heating systems .

Both tanks are separately integrated into a single robust housing made of Duplex 2205 stainless steel – a high-quality alloy known for its excellent corrosion resistance , pressure resistance and hygienic properties. Thanks to this choice of material, the CDWT-215L is not only durable and low-maintenance, but also suitable for drinking water use and applications in humid or aggressive environments.

The spiral heat exchanger (coil) with a surface area of ​​1.7 m² is fully integrated in the boiler tank and ensures a powerful and efficient heat transfer, even at low supply temperatures. This makes this unit perfect for use in combination with air/water heat pumps or systems with low temperature regimes.

The tank is equipped with 50 mm PUR rigid foam insulation all around with a very low thermal conductivity coefficient. This minimizes standstill losses and maximizes the energy efficiency of the entire heating system. Thanks to its compact design and smart connections, the CDWT-215L is easy to integrate into small technical spaces, such as built-in cupboards, storage rooms or under stairs.

Key benefits:

• Compact 2-in-1 system: 150L boiler + 65L buffer tank in one housing

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

• 1.7 m² spiral heat exchanger: high transfer efficiency, optimized for heat pumps

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

• Space-saving design: fits in small technical rooms or renovation projects

• Easy installation: flexible connections and sensor inputs for control technology

• Energy efficient and low maintenance: suitable for sustainable applications

Technical specifications (summary):

• Total volume: 215 liters

• Boiler tank: 150 liters

• Buffer tank: 65 liters

• Tank material: Duplex 2205 stainless steel

• Insulation: 50 mm PUR hard foam

• Spiral surface: 1.7 m²

• Heat exchanger capacity at 80/10/45 °C: approx. 18.7 kW

• Max. working pressure tank: 10 bar

• Max. working pressure spiral: 16 bar

• Max. tank temperature: 95 °C

• Dimensions (h x Ø): 1280 x 650 mm

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

Applications:

• Air/water and ground/water heat pumps

• Solar boiler systems

• Hybrid heating systems (e.g. central heating + WP)

• New construction, renovation, tiny houses and apartments

• Technical rooms with limited installation space

• Small utility projects, holiday homes, agricultural use

The CDWT-215L is designed for installers and end users looking for a sustainable, compact and intelligent boiler solution with high performance and maximum flexibility. The combination of advanced materials, well thought-out design and efficient heat transfer makes this unit an absolute added value for any future-oriented energy system.