Floor-standing vitrified spiral coil tank, 150 litres, diameter 560mm

The Mecalia 05825 DPAV/IBC 150 indirect water heater is a vertical floor-standing tank for the storage and production of domestic hot water (DHW), made of vitrified steel and equipped with a heat exchanger using a spiral coil. With a nominal capacity of 150 liters, it is specially sized to work with heat pumps, although Mecalia also considers its use with boilers and solar energy systems.

Its coil has a heat exchange surface of 1.40 m² and a declared exchange power of 18 kW under the test conditions specified by the manufacturer. The tank includes insulation made of HCFC-free injected rigid polyurethane foam, cathodic protection by magnesium anode, and an inspection opening to facilitate inspection and maintenance operations.

150-liter indirect water heater for DHW production

The Mecalia 05825 reference belongs to the DPAV/IBC range of indirect water heaters with spiral coil and is designed for installations that need to produce and store domestic hot water using an external heat source.

The model has a nominal capacity of 150 liters and a declared effective capacity of 131 liters, making it suitable for household use and small to medium storage volumes.

Typical applications include single-family homes and other domestic DHW installations.

Specially designed for heat pump systems

Mecalia has sized the internal coil of the DPAV/IBC range taking into account the needs of a heat pump installation.

This is especially important in aerothermal systems, where primary circuit temperatures are usually lower than those traditionally used with a boiler and an adequate heat exchange surface is needed to transfer energy to the stored water.

Mecalia's current commercial documentation considers the model for systems with:

• Heat pump.
• Boiler.
• Solar energy.

1.40 m² spiral coil

The DPAV/IBC 150 incorporates a spiral coil with a heat exchange surface of 1.40 m².

The internal coil volume is 8.6 liters and Mecalia declares a pressure drop of approximately 0.12 m.c.a. under the indicated test conditions.

This internal heat exchanger transfers to the stored DHW the energy coming from the primary circuit of the heat pump, boiler, or compatible solar system.

18 kW exchange power

For the 150-liter model, Mecalia declares an exchange power of 18 kW.

This value is established with primary circuit operating conditions of 55/45 °C and secondary circuit conditions of 10/45 °C, so the actual power obtained in an installation will depend on temperatures, flow rates, and effective operating conditions.

DHW production of up to 440 l/h under test conditions

Under the test conditions indicated by Mecalia, the DPAV/IBC 150 delivers a production of 440 liters per hour.

The primary flow rate used as a reference by the manufacturer is 1,550 l/h.

These data make it possible to size the indirect water heater more accurately when it is integrated with the appropriate heat generator.

Vitrified steel tank

The tank is made of vitrified steel using the flow-coating method at 850 °C, in accordance with DIN 4753.

The vitrification creates an internal coating designed to protect the steel against continuous contact with domestic water and forms part of the tank's anti-corrosion protection.

Magnesium anode included

The indirect water heater includes a standard magnesium cathodic protection anode.

The anode acts as a consumable element to complement the tank's protection against corrosion. As with vitrified storage tanks, it must be checked periodically and replaced when wear requires it.

Polyurethane thermal insulation

The DPAV/IBC uses HCFC-free injected rigid polyurethane foam as thermal insulation.

The exterior finish indicated by Mecalia is skay. The insulation helps reduce heat losses from the stored water and, therefore, the need to reintroduce energy into the tank.

Energy efficiency class C

The technical sheet for the DPAV/IBC 150 model establishes an energy efficiency class C.

The static losses declared by the manufacturer are 73 W.

Vertical floor-standing installation

The indirect water heater is designed for a vertical floor-standing installation.

Its cylindrical format makes it possible to concentrate 150 liters of nominal capacity in the following external dimensions:

• Diameter: 560 mm.
• Height: 1,070 mm.

These dimensions must be taken into account both when selecting the location and when planning the access required during installation and later maintenance tasks.

Inspection opening included

The Mecalia DPAV/IBC includes a DN110 inspection opening, facilitating access to the inside of the tank during certain inspection and maintenance operations.

This feature is especially useful for periodic maintenance of the storage tank throughout its service life.

Connection for electric heating element

The tank includes a 1½" connection intended for the installation of a compatible electric heating element.

This connection makes it possible to set up electric backup configurations when the installation design requires it. The heating element should not be considered included unless expressly stated in the supply.

DHW recirculation connection

The indirect water heater has a 3/4" recirculation connection.

This connection allows it to be integrated into DHW networks with a return circuit, which are common when hot water is needed quickly at points of use far from the storage tank.

Thermostat connections

The tank has different 1/2" connections for thermostat or temperature sensors, allowing the temperature of the stored water to be monitored and this information to be used to control the heat generator.

Hydraulic connections

According to Mecalia's technical diagram, the DPAV/IBC 150 model has the following connections:

• Magnesium anode: 1¼".
• Inspection opening: DN110.
• Drain: 1".
• Cold water inlet: 1".
• Primary circuit return: 1".
• Thermostat connections: 1/2".
• DHW recirculation: 3/4".
• Primary circuit flow: 1".
• DHW outlet: 1".
• Connection for electric heating element: 1½".
• Air vent connection: 1".

Maximum operating temperature of 90 °C

Mecalia specifies a maximum operating temperature of 90 °C for this range of indirect water heaters.

The manufacturer also indicates that the corresponding safety valves must always be installed in the system.

Weight of 70 kg

The DPAV/IBC 150 has an approximate empty weight of 70 kg.

Once filled, the total weight of the installation increases considerably, so the floor and selected location must be suitable to support the tank in service.

Technical features of the Mecalia 05825

• Brand: Mecalia.
• Reference: 05825.
• Model: DPAV/IBC 150.
• Type: DHW indirect water heater with spiral coil.
• Installation: vertical floor-standing.
• Nominal capacity: 150 liters.
• Effective capacity: 131 liters.
• Tank material: vitrified steel.
• Vitrification system: flow-coating at 850 °C according to DIN 4753.
• Coil surface: 1.40 m².
• Coil volume: 8.6 liters.
• Exchange power: 18 kW.
• DHW production: 440 l/h under the manufacturer's test conditions.
• Primary flow rate: 1,550 l/h.
• Coil pressure drop: 0.12 m.c.a.
• Primary test conditions: 55/45 °C.
• Secondary test conditions: 10/45 °C.
• Maximum operating temperature: 90 °C.
• Insulation: injected rigid polyurethane foam.
• HCFC-free: yes.
• Exterior finish: skay.
• Anti-corrosion protection: magnesium cathodic anode.
• Anode included: yes.
• Inspection opening: DN110.
• Connection for heating element: 1½".
• Recirculation connection: 3/4".
• Energy class: C.
• Static losses: 73 W.
• Diameter: 560 mm.
• Height: 1,070 mm.
• Weight: approximately 70 kg.

Indirect water heater for aerothermal systems, boilers, or solar energy

The Mecalia 05825 DPAV/IBC 150 offers a compact solution for producing and storing DHW using an external heat generator. Its 1.40 m² coil is specially sized to work with a heat pump, while Mecalia's commercial documentation also considers its use with boilers and solar energy.

The combination of a vitrified steel tank, magnesium anode protection, polyurethane insulation, inspection opening, recirculation connection, and connection for an electric heating element makes it suitable for domestic DHW installations that require a vertical 150-liter indirect water heater with good maintenance and hydraulic configuration options.