Indirect DHW Cylinder Galmet R051007140 140 L with Spiral Heat Exchanger, ErP Class B (DWZ)

Indirect DHW Cylinder Galmet R051007140 140 L with Spiral Heat Exchanger, ErP Class B (DWZ) is a 140‑litre indirect domestic hot water storage tank with an integrated spiral heat exchanger. Designed for connection to external heat sources such as boilers or solar circuits, the tank provides buffer storage for domestic hot water and supports separation of potable water from primary heating circuits. The unit is classified ErP Class B for energy performance and intended for installation in central heating systems and combined heating installations.

Advantages

The spiral heat exchanger ensures efficient heat transfer between the primary heating circuit and the stored domestic hot water, delivering stable hot water supply while minimising mixing of fluids. With a 140‑litre capacity the cylinder suits medium domestic installations and reduces the frequency of boiler cycling. The indirect design allows integration with various external heat sources, including condensing boilers and solar thermal systems, while the ErP Class B rating describes its tested energy performance under standardised conditions.

Suitable for

• Domestic hot water storage in single‑family homes and small multifamily units
• Integration with gas or oil boilers and condensing boilers
• Combination with solar thermal collectors as a stratified storage element
• Systems requiring separation between potable water and primary heating circuit

Key specifications

• Usable volume: 140 litres
• Type: indirect domestic hot water cylinder with integrated spiral heat exchanger
• Energy efficiency class: ErP Class B
• Designed for connection to external boilers and solar thermal circuits
• Suitable for central heating and domestic hot water systems

How to use

Install the cylinder according to local plumbing and heating regulations and manufacturer's installation instructions. Connect the spiral heat exchanger to the primary heating circuit (boiler or solar loop) and the potable water inlet/outlet to the domestic water supply. Ensure appropriate safety components are fitted on the primary and hot water sides, such as pressure relief valves, expansion vessels and check valves where required. Commission the system by filling, venting and heating the cylinder while checking for leaks and correct flow through the heat exchanger.

Usage recommendations

For reliable operation, size the cylinder and the primary heat source to match hot water demand and peak draw-off. Use corrosion protection and water treatment methods appropriate for the local water quality and follow recommended maintenance intervals to inspect connections, valves and insulation. When combining with solar thermal collectors, incorporate appropriate control and stratification measures to optimize heat collection and storage.