Expansion/Pressure Vessel Reflex DE 18L (domestic hot water) model 7303013

Reflex DE 18L (domestic hot water) model 7303013 is a diaphragm expansion and pressure vessel designed for closed domestic hot water systems. With an 18-litre nominal volume, the vessel absorbs thermal expansion from heating of potable water, helps maintain steady system pressure and reduces cycling of pumps and valves. The compact steel body with internal elastomer diaphragm separates the water circuit from the pre-charged gas cushion, providing reliable pressure compensation and protection against overpressure in domestic hot water applications.

Advantages

The Reflex DE 18L offers stable pressure control and hydraulic buffering in domestic hot water installations without introducing contaminants into the potable water circuit thanks to its diaphragm separation. Its 18-litre capacity is suited to typical residential systems, limiting pressure peaks and reducing wear on fittings and pumps. Constructed for corrosion resistance and long service life, the vessel requires minimal maintenance and is compatible with standard connection sizes used in domestic installations.

Suitable for

• Residential domestic hot water systems requiring thermal expansion compensation
• Hydraulic buffering and pressure stabilization in single- or multi-point potable water circuits
• Installations aiming to reduce pump cycling and protect valves and fittings

Key specifications

• Nominal volume: 18 litres
• Type: Diaphragm expansion/pressure vessel for domestic hot water
• Internal separation: Elastomer diaphragm separating water and gas chamber
• Function: Absorbs thermal expansion, maintains system pressure, prevents overpressure
• Materials: Steel pressure shell with internal elastomer diaphragm
• Mounting: Fixed standing or bracket-mounted installation typical for domestic plant rooms

How to use

Install the Reflex DE 18L in the cold-water return line or close to the hot-water supply circuit where thermal expansion occurs, following local regulations and installation practices. Ensure the vessel is mounted on a stable base or secured with appropriate brackets, with piping designed to minimize strain on connections. Before commissioning, check and set the pre-charge gas pressure in the vessel to correspond with the static system pressure, then fill and vent the potable water circuit. Perform leak checks and confirm that the vessel accepts expansion during system heat-up.

Usage recommendations

Verify compatibility of operating and maximum allowable temperatures and pressures with the domestic hot water system. Periodically inspect connections and verify the pre-charge pressure, especially after major maintenance. For safe and reliable operation follow local plumbing codes and manufacturer installation guidelines.