Wall-mounted vitrified spiral coil tank 150 litres diameter 520mm

The Mecalia 07932 DPAV/IM S1 150 wall-mounted indirect storage water heater is designed for the storage and production of domestic hot water (DHW) using solar energy or a boiler. It has a nominal capacity of 150 liters, an effective capacity of 138 liters, and an internal heat exchanger with a 1.00 m² spiral coil. Its tank is made of vitrified steel using the flow-coating process at 850 °C according to DIN 4753 and is prepared for vertical wall-mounted installation.

The unit operates with a maximum pressure of 8 bar in the DHW circuit and 6 bar in the coil, supports temperatures of up to 90 °C, and includes cathodic protection through a magnesium anode. Its HCFC-free injected rigid polyurethane foam insulation helps reduce heat losses from the stored water.

150-liter wall-mounted indirect storage water heater for DHW

Reference 07932 corresponds to Mecalia’s DPAV/IM S1 150 model, an indirect storage tank designed for installations where DHW needs to be produced and stored using an external heat generator.

Its main capacities are:

• Nominal capacity: 150 liters.
• Effective capacity: 138 liters.
• Installation: vertical wall-mounted.
• Diameter: 520 mm.

Its wall-mounted format makes it possible to make the most of available space in technical rooms and other installation areas where floor space needs to be kept free.

Vitrified steel tank

The tank is made of vitrified steel using the flow-coating method at 850 °C according to DIN 4753.

The vitrified coating protects the inner surface of the tank, which is in permanent contact with domestic water, providing a dedicated solution for DHW storage.

1.00 m² spiral coil

The Mecalia DPAV/IM S1 150 incorporates a heat exchanger with an internal spiral coil located inside the tank.

For the 150-liter model, Mecalia specifies a heat exchange surface of 1.00 m².

The manufacturer indicates that this coil is sized according to the needs of a solar thermal energy installation and is also suitable for boiler operation.

Heat exchange output of 27.09 kW

Under the test conditions established by Mecalia, the 150-liter model coil reaches a heat exchange output of 27.09 kW.

This value is obtained under the following conditions:

• Primary circuit: 90/70 °C.
• Secondary circuit: 10/45 °C.

The actual output available in an installation may vary depending on operating temperatures, flow rates, generator power, and the hydraulic conditions of the system.

DHW production of 354 liters per hour

Under the test conditions of 90/70 °C on the primary side and 10/45 °C on the secondary side, Mecalia declares a production rate of 354 l/h.

For these conditions, the manufacturer specifies a primary circuit flow rate of 733 l/h.

Coil volume of 4.50 liters

The internal coil has a volume of 4.50 liters.

The pressure drop declared by Mecalia is approximately 0.31 m.w.c., a value that must be taken into account when sizing the primary circuit and selecting the circulation pump.

Prepared for solar energy and boiler operation

Mecalia has developed this indirect storage water heater for DHW production using solar thermal energy or a boiler.

It can operate with:

• Solar thermal energy.
• Gas boiler.
• Oil boiler.
• Biomass boiler.

The heat from the generator circulates through the internal coil and is transferred to the domestic water stored in the tank.

DHW pressure up to 8 bar

The tank is designed to operate with a maximum DHW pressure of 8 bar.

The primary circuit passing through the coil supports a maximum pressure of 6 bar.

Mecalia expressly states that the corresponding safety valves must always be installed. Protective components must be sized according to the characteristics of the equipment and the installation.

Maximum temperature of 90 °C

The maximum operating temperature specified by Mecalia for this indirect storage water heater is 90 °C.

The usual operating temperature of an installation should be set according to the generator used, the control system, and the DHW requirements.

Magnesium anode included

The tank includes a magnesium cathodic protection anode supplied as standard.

This component complements the anti-corrosion protection of the vitrified tank. As it is a consumable part, its condition must be checked periodically during maintenance operations and replaced when wear requires it.

Rigid polyurethane insulation

The indirect storage water heater uses injected rigid polyurethane foam as thermal insulation.

Mecalia specifies that the insulating material is HCFC-free and that the exterior finish is made with oven-lacquered sheet metal.

The insulation reduces heat transfer to the surrounding environment and helps keep the stored DHW at temperature for longer.

Energy efficiency class C

The technical data sheet for the DPAV/IM S1 150 specifies an energy efficiency class C.

The declared standing losses are 71 W, corresponding to the thermal dissipation of the tank under standardized test conditions.

Vertical wall-mounted installation

The Mecalia 07932 is specifically designed for a vertical wall-mounted installation.

This configuration frees up floor space and is especially practical in technical rooms, plant rooms, and other locations with limited available surface area.

The wall, anchors, and fixing system must be suitable to safely support the weight of the fully filled unit, as well as the loads transmitted by the piping.

520 mm diameter

The 150-liter model has an external diameter of 520 mm.

The Mecalia 2025 price list specifies commercial dimensions of Ø520 x 1,085 mm height, a particularly useful reference for checking available installation space in advance.

Weight of 70 kg

The manufacturer’s technical sheet states an empty weight of approximately 70 kg.

Once filled with water, the total weight increases significantly, so special attention must be paid to the wall strength and the anchoring system used for installation.

Hydraulic connections

The manufacturer’s technical diagram identifies the connections required to integrate the tank into the DHW and thermal production circuits.

• DHW outlet: 1/2".
• Cold water inlet: 1/2".
• Primary circuit flow: 3/4".
• Primary circuit return: 3/4".
• Thermostat pocket: included in the design.
• Magnesium anode: included.

For the 150-liter DPAV/IM S1 model, the technical table does not indicate a separate recirculation connection.

2,000 W electric resistance according to the technical sheet

The Mecalia technical table specifies a 2,000 W electric resistance at 230 V for the DPAV/IM S1 150 model.

This system provides electric backup for water heating under the conditions defined by the manufacturer.

Technical features of the Mecalia 07932

• Brand: Mecalia.
• Reference: 07932.
• Model: DPAV/IM S1 150.
• Type: DHW indirect storage water heater with spiral coil.
• Installation: vertical wall-mounted.
• Nominal capacity: 150 liters.
• Effective capacity: 138 liters.
• Tank material: vitrified steel.
• Vitrification: flow-coating at 850 °C according to DIN 4753.
• Heat exchange surface: 1.00 m².
• Heat exchange output: 27.09 kW under 90/70 °C - 10/45 °C test conditions.
• Coil volume: 4.50 liters.
• Coil pressure drop: 0.31 m.w.c.
• DHW production: 354 l/h under the manufacturer’s test conditions.
• Primary flow rate: 733 l/h.
• Maximum DHW pressure: 8 bar.
• Maximum coil pressure: 6 bar.
• Maximum operating temperature: 90 °C.
• Insulation: injected rigid polyurethane foam.
• HCFC-free: yes.
• Exterior finish: oven-lacquered sheet metal.
• Anti-corrosion protection: magnesium cathodic anode.
• Magnesium anode included: yes.
• Resistance stated in technical sheet: 2,000 W.
• Resistance voltage: 230 V.
• DHW outlet: 1/2".
• Cold water inlet: 1/2".
• Primary flow: 3/4".
• Primary return: 3/4".
• Diameter: 520 mm.
• Current commercial height: 1,085 mm.
• Empty weight: 70 kg.
• Energy class: C.
• Standing losses: 71 W.
• Application: DHW production and storage.
• Thermal sources considered: solar energy or gas, oil, or biomass boiler.

Compact indirect storage water heater for DHW with solar energy or boiler

The Mecalia DPAV/IM S1 150 combines 150 liters of nominal capacity with a 1 m² spiral coil and a vertical wall-mounted installation, providing a particularly practical solution for producing and storing DHW without taking up floor space.

Its vitrified steel tank, magnesium anode, polyurethane insulation, 8 bar DHW pressure rating, and 90 °C maximum temperature make it suitable for domestic and professional installations powered by solar thermal energy or a boiler.

Thanks to its 138 liters of effective capacity, 354 l/h production under the manufacturer’s test conditions, and Ø520 mm format, it is especially suitable for installations that need a medium-capacity wall-mounted solution with an internal heat exchanger.