Mecalia DPAC/DI/MCL 100-Liter Wall-Mounted Buffer Tank

The Mecalia DPAC/DI/MCL 100-liter wall-mounted buffer tank, reference 12508, is designed to store cold or hot water from the primary circuit of heating and HVAC systems. Made of carbon steel, it operates at a maximum pressure of 6 bar and a temperature of up to 90 °C, making it a particularly suitable solution for installations with heat pumps, boilers, solar energy, or chilled water production equipment.

Its main function is to provide volume and thermal inertia to the hydraulic circuit, helping to stabilize generator operation and temporarily store thermal energy. The 100-liter model has a compact format of Ø440 mm and is designed for vertical wall-mounted installation, although the mini range also allows vertical floor-standing installation according to the manufacturer's instructions.

100-liter buffer tank for heating and HVAC

The Mecalia DPAC/DI/MCL 100 belongs to the manufacturer's range of compact buffer tanks, available in capacities from 30 to 100 liters.

It is intended to work with primary circuit water in systems where it is advisable to increase the available hydraulic volume, temporarily store energy, or partially decouple heat or cold production from the system demand.

It can be used with both hot and cold water, making it suitable for installations of:

• Air source heat pumps and heat pumps.
• Boilers.
• Heating with radiators or underfloor heating.
• HVAC systems.
• Water chillers.
• Solar thermal installations.

Not suitable for domestic hot water

The manufacturer expressly states that this buffer tank is not suitable for DHW.

It is designed exclusively to operate in a closed hydraulic circuit for heating or HVAC. For this reason, it must not be used as a potable water storage tank or as a domestic hot water tank for human consumption.

Made of carbon steel

The tank is made of carbon steel, a material suitable for closed primary circuits in thermal installations.

As it is intended for the technical circuit and not for sanitary water, it does not include the internal vitrified coating characteristic of DHW storage tanks.

Working pressure of 6 bar

The compact DPAC/DI/MCL range from 30 to 100 liters is designed to operate at a maximum pressure of 6 bar.

This operating pressure allows integration into many domestic and professional heating and HVAC systems. The system must always include the corresponding safety valves and components sized according to the characteristics of the installation.

Maximum operating temperature of 90 °C

The Mecalia DPAC/DI/MCL supports a maximum operating temperature of 90 °C.

This wide thermal range allows the tank to be used in both heating installations and hydraulic cooling systems, always within the limits established by Mecalia and the rest of the circuit components.

Ideal for heat pump installations

Buffer tanks are especially common in air source heat pump and heat pump installations, where they help increase the amount of water available in the circuit.

Incorporating a properly sized buffer volume can help reduce generator start-stop cycles, stabilize hydraulic flow, and provide a temporary thermal reserve.

The final tank sizing must be carried out according to the heat pump power, the existing water volume, the generator manufacturer's minimum flow requirements, and the specific characteristics of the installation.

Suitable for heating and cooling circuits

The tank can store cold or hot water from the primary circuit, so it is not limited to heating applications only.

It can also be used in HVAC systems with a chiller or reversible heat pump to provide inertia to the circuit when the system is operating in cooling mode.

Rigid polyurethane thermal insulation

The tank incorporates insulation with injected rigid polyurethane foam, designed to reduce unwanted heat exchange between the stored water and the surrounding environment.

The insulation used by Mecalia is HCFC-free.

In this compact range, the manufacturer also uses an exterior finish with oven-lacquered sheet metal, providing mechanical protection for the insulation and a suitable finish for indoor technical installations.

Vertical wall-mounted format

Reference 12508 is included by Mecalia among the wall-mounted installation models in the DPAC/DI/MCL range.

Its reduced diameter of 440 mm makes it easier to place in technical rooms and other spaces where limiting the footprint of hydraulic components is important.

The manufacturer's current price list indicates the following commercial dimensions for this reference:

• Diameter: 440 mm.
• Height: 913 mm.

1½" threaded hydraulic connections

The dimensional sheet for the DPAC/DI/MCL 100 shows different connections distributed vertically on both sides of the tank to facilitate hydraulic integration.

In the 100-liter model, the connections indicated in the technical drawing are 1½" female threads.

The design provides specific points for:

• Connections to the installation.
• Connections to the generator or boiler.
• Vent or sensor installation.
• Tank draining.

The arrangement of several connections at different heights provides flexibility to adapt the hydraulic layout to the needs of each installation.

Connections for installation and generator

According to Mecalia's technical drawing, the tank has several ports specifically identified as installation connections and boiler connections.

This configuration makes it easier to use as an inertia element placed between the thermal generator and the distribution circuit.

The specific choice of connections to be used will depend on the hydraulic scheme, flow rates, and the generator manufacturer's recommendations.

Top connection for venting or sensor

The upper part includes a connection intended for venting or sensor installation.

This port can facilitate the removal of air accumulated in the upper part of the tank or allow the installation of a compatible measuring element according to the system design.

Bottom connection for draining

At the bottom, there is a connection identified for draining, making maintenance and circuit drainage operations easier when necessary.

Weight of 29 kg

The Mecalia DPAC/DI/MCL 100 has an approximate empty weight of 29 kg.

It should be noted that, once filled, the assembly increases significantly in weight. The wall fixing system and structural support must be sized to safely support the total weight of the full tank and the loads from the connected piping.

Helps stabilize system operation

Adding a buffer tank increases the amount of water available within the circuit. This thermal reserve helps smooth rapid temperature variations and can reduce how often the generator needs to start and stop.

In systems with multiple circuits or variable demands, the additional volume can also help provide more stable hydraulic conditions.

The exact function and connection scheme must be determined during system design, as a buffer tank can be used in different ways depending on the generator, emitters, and control system.

Technical specifications of Mecalia 12508

• Brand: Mecalia.
• Reference: 12508.
• Model: DPAC/DI/MCL 100.
• Type: buffer tank.
• Capacity: 100 liters.
• Application: heating and HVAC.
• Fluid: cold or hot water from the primary circuit.
• Suitable for DHW: no.
• Circuit type: closed.
• Material: carbon steel.
• Installation: vertical wall-mounted.
• Maximum working pressure: 6 bar.
• Maximum working temperature: 90 °C.
• Connections: female threaded.
• Connection size for the 100 L model: 1½".
• Vent/sensor connection: yes.
• Drain connection: yes.
• Connections to installation: yes.
• Connections to generator/boiler: yes.
• Insulation: injected rigid polyurethane foam.
• HCFC-free insulation: yes.
• Exterior finish: oven-lacquered sheet metal.
• Diameter: 440 mm.
• Current commercial height: 913 mm.
• Weight: approximately 29 kg.
• Compatible with heat pump: yes.
• Compatible with boiler: yes.
• Compatible with solar energy: yes.
• Usable in cooling: yes.

Compact buffer tank for heat pump and HVAC

The Mecalia DPAC/DI/MCL 100 provides 100 additional liters of hydraulic volume in a compact wall-mounted format, making it a particularly useful solution for air source heat pump, heating, and cooling systems where increased thermal inertia in the circuit is required.

Its carbon steel construction, maximum pressure of 6 bar, operating temperature of up to 90 °C, polyurethane insulation, and multiple 1½" connections make it easy to integrate into different professional hydraulic schemes.

As it is intended exclusively for primary circuit water, it must always be used in a closed circuit and not as a domestic hot water storage tank.