Indirectly fired Fast boiler and buffer tank in 1 (housing) CDWT-500L Duplex 2205 Boiler tank 300L, Buffer tank 200 liter, with coil (spiral) Heat pump boiler

CDWT-500L – Fast Boiler Tank & Buffer Vessel in one housing – 500 Liter (300L + 200L), Duplex 2205 Stainless Steel, with Spiral for Heat Pump

The Coolmark CDWT-500L Fast Boiler & Buffertank Combination is an innovative 2-in-1 solution that combines a hot water boiler and buffer tank in one compact, robust stainless steel housing. Specially developed for use in combination with heat pumps, solar energy systems and hybrid heating systems, this unit offers maximum efficiency, space saving and ease of installation.

The tank consists of two separate compartments:

• A 300 litre boiler tank for sanitary hot water

• A 200 litre buffer tank for space heating or additional storage

Both tanks are manufactured from Duplex 2205 stainless steel, a high-quality alloy known for its exceptional resistance to corrosion, high temperatures and pressure. This makes this boiler buffer set suitable for both domestic and commercial applications with heavy use.

The integrated spiral heat exchanger (coil) has a surface area of ​​3.3 m² and is optimised for low-temperature sources, such as air-to-water heat pumps. This ensures fast and efficient transfer of heat from the heating system to the tap water.

Thanks to the high insulation value with 50 mm PUR hard foam around both compartments, heat losses are kept to a minimum, which contributes to lower energy consumption and higher system efficiency.

Key benefits:

• 2-in-1 solution: boiler (300L) + buffer tank (200L) in one compact unit

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

• Efficient spiral heat exchanger: 3.3 m² surface, high transfer capacity

• Ideal for heat pumps: optimized for low flow temperatures

• PUR insulation 50 mm: minimal downtime losses and high efficiency

• Versatile connection options: flexible integration into various systems

• Compact and space-saving design: less installation space required

Technical specifications (summary):

• Total volume: 500 liters

• Boiler tank: 300 liters

• Buffer tank: 200 liters

• Tank material: Duplex 2205 stainless steel

• Insulation: 50 mm PUR hard foam

• Spiral surface: 3.3 m²

• Max. working pressure tank: 10 bar

• Max. working pressure spiral: 16 bar

• Max. tank temperature: 95 °C

• Dimensions (h x Ø): 1800 x 650 mm

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

Applications:

• Air/water and ground/water heat pumps

• Solar boiler systems

• Hybrid heating systems

• New-build homes, apartments, commercial buildings

• Hotels, sports facilities, agricultural and commercial installations