Indirect 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

Coolmark's CDWT-215L Fast Boiler and Buffer Tank is a compact 2-in-1 total solution for installations where energy efficiency, space savings and high performance are essential. With a capacity of 150 liters for domestic hot water and 65 liters of buffer volume for low-temperature heating, this unit is perfect for applications with heat pumps, solar 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 potable water use as well as applications in humid or aggressive environments.

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

The tank is surrounded by 50 mm PUR rigid foam insulation with a very low thermal conductivity. This minimizes downtime 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 losses

• Space-saving design: fits in small engineering spaces 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 rigid foam

• Spiral surface area: 1.7 m²

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

• Max. working pressure tank: 10 bar

• Max. working pressure coil: 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-to-water and soil-to-water heat pumps

• Solar water heating systems

• Hybrid heating setups (e.g., central heating + WP)

• New construction, renovations, tiny houses and apartments

• Technical rooms with limited set-up space

• Small utility projects, vacation homes, agricultural use

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