ELIZ EURO 300 S1

Product detailed description

The ELIZ EURO 300 S1 is commonly used in residential and commercial buildings where a reliable hot water supply is required alongside a central heating system. Installers often integrate this unit into systems with boilers, solar collectors or heat pumps. The tank’s dual heating options allow for flexible operation depending on available energy sources. The model is particularly suited for applications where a high-capacity hot water reserve is needed, such as in multi-bathroom homes, small hotels or commercial kitchens. The unit is designed for floor installation and requires sufficient space for access and maintenance.

Its modular design allows for seamless integration with existing heating infrastructure. The unit is also suitable for off-grid or hybrid systems where renewable energy sources are used. The combination of electric heating and thermal input ensures continuous hot water supply even when primary heating sources are offline or under maintenance. The model is ideal for installations where hot water demand exceeds standard instantaneous systems and where storage capacity is required for peak usage periods.

Technical parameters

type	EURO 300 S1
power	3 x 2000 W
voltage	400 V
fusing	3 x 16 A
electrical protection	IP 24
maximum tank pressure	6 bar
water connection	3/4 inch
heating time from 12 to 65 °C	3.3 hours
heat exchanger connection	3/4 inch
heat exchanger surface area S1	1.15 m²
heat exchanger power S1	35 kW
circulation	yes
free-standing	yes
safety fuse	yes
weight	80 kg
product dimensions	width / height / depth: 670 x 1625 mm
tank warranty	5 years
product warranty	2 years
EAN	3800035732627
Code	ELZ_3332
Brand	ELIZ

The parameters indicate the unit is intended for three-phase 400 V operation with a maximum load of 3 x 16 A. The 3.3-hour heating time from 12 to 65°C is relevant for sizing in relation to expected hot water consumption patterns. The 35 kW heat exchanger capacity and 1.15 m² surface area are important for calculating thermal input efficiency when using external sources such as boilers or solar collectors. The 3/4 inch threaded connections require standard pipe fittings for installation.Installation and connection Installers should ensure the unit is placed on a stable, level surface with adequate clearance for maintenance. The 3/4 inch threaded connections for water and the heat exchanger require standard pipe fittings. A dedicated electrical circuit with a 3 x 16 A fuse and 400 V supply must be provided. The unit must be earthed and protected by a residual current device (RCD) according to local regulations. A circulation line can be connected via the central tank opening for maintaining hot water availability in large buildings. Installers should verify the correct orientation of the electric heating element, which is mounted in the lower part of the tank. Common installation errors include incorrect electrical wiring, failure to install a pressure relief valve or neglecting to secure the tank against movement. After installation, a pressure test up to 6 bar should be performed to confirm system integrity.

Compatibility and accessories

This model is compatible with a range of external heat sources including gas or oil boilers, solar thermal collectors and heat pumps. For solar integration, additional components such as a solar controller and pump may be required. A pressure relief valve and expansion vessel are essential for safe operation. When using the electric heating function, a thermostat and control panel are already included. Installers should ensure all additional components are correctly sized and compatible with the system pressure and flow rates.

Technical background for designers

The unit operates by heating water either through electric resistance or via a heat exchanger connected to an external source. The internal tank and heat exchanger are made from high-quality steel and coated with zirconium-enriched glass enamel to resist corrosion. This coating provides a smooth surface that minimises scale buildup and extends the tank’s lifespan. The double anode protection system includes two magnesium alloy rods that further reduce corrosion effects. The heat exchanger’s 1.15 m² surface area allows for efficient thermal transfer when connected to an external source. The unit’s insulation consists of high-density polyurethane foam with a thickness of 85 mm, ensuring low thermal losses and reducing operational costs. The tank’s internal design includes a central circulation port and two ports for connecting temperature sensors. These features allow for precise control and monitoring of the system, especially when integrated with automated control systems.

Service and operation

Regular maintenance includes checking the condition of the anodes and replacing them when signs of depletion are observed. The pressure relief valve should be tested periodically to ensure it operates correctly. The electric heating element should be inspected for scale buildup, which can affect efficiency. No specific service intervals are provided, but it is recommended to perform annual checks for optimal performance. Installers should monitor the tank’s pressure and temperature during operation. The IP 24 rating indicates the electrical components are protected against solid objects larger than 1 mm and splashing water, making the unit suitable for indoor installation. The safety features include a thermal cut-out to prevent overheating and a light indicator for the electric heating function.

Frequently asked questions

Can the ELIZ EURO 300 S1 be connected to a solar thermal system?
Yes, the unit includes a heat exchanger for integration with solar collectors or other external heat sources. A solar controller and circulation pump are typically required for complete system functionality.

What is the maximum pressure the tank can handle?
The tank is rated for a maximum pressure of 6 bar. A pressure relief valve must be installed to ensure system safety and prevent overpressure conditions.

Is the electric heating function adjustable?
Yes, the electric heating function includes a thermostat that allows setting the desired water temperature between 30 and 75°C. The temperature control is located under the tank cover.

What is the purpose of the two ports on the tank?
The two ports are designed for connecting temperature sensors used in the control system. They allow for monitoring and regulating the water temperature based on the selected settings.

Documents for download

• Technical specification sheet (PDF)