Domusa SIRENA MIX DUO HFD 30 Oil Boiler

The Domusa SIRENA MIX DUO HFD 30 oil boiler, reference TSIRM00F12, is a low-temperature combi boiler designed to provide heating and instant domestic hot water (DHW). Its cast iron body, complete hydraulic equipment and dual-pump system make it an especially suitable solution for domestic installations looking to combine heating and DHW production in a single unit.

This model offers a useful output of 28.1 kW and a nominal heat output of 29 kW. Domestic hot water production reaches 13.4 liters/min with a 30 °C temperature rise, providing instant supply without the need for a separate DHW storage tank.

Main features of the Domusa SIRENA MIX DUO HFD 30

• Oil combi boiler: provides heating and instant domestic hot water.
• Useful output: 28.1 kW.
• Nominal heat output: 29 kW.
• DHW production: up to 13.4 liters/min with ΔT of 30 °C.
• Cast iron boiler body, designed to offer robustness and resistance to the conditions typical of oil combustion.
• Low-temperature boiler with wet combustion chamber and three-pass flue gas path.
• Dual-pump hydraulic system, with heating pump and pump for the DHW primary circuit.
• Energy efficiency class B for both heating and domestic hot water production.
• ACS XL load profile.
• Sound level of 53 dB according to the manufacturer’s energy label.
• Model adapted to ErP requirements and low NOx emissions.
• Analog/electrical control on this reference, without electronic control.

Heating and instant DHW in a single unit

The SIRENA MIX DUO HFD 30 belongs to Domusa’s range of combi boilers designed to simultaneously cover heating and domestic hot water needs. The instant production system generates DHW when there is demand, avoiding the need to incorporate a storage tank exclusively for this service.

For domestic hot water production, it incorporates a heat exchanger and a specific pump for the DHW primary circuit. Together with the flow switch and flow limiter, these components allow hot water demand to be managed in an integrated way within the boiler itself.

Cast iron body and high thermal efficiency

One of the characteristic elements of the SIRENA HFD range is its boiler body made of cast iron. Domusa uses a configuration with a large heat exchange surface and a flue gas path through three passes, designed to enhance heat transfer to the heating circuit.

The cast iron construction also provides high resistance to corrosion caused by oil combustion, helping to extend the service life of the unit when installation and periodic maintenance are carried out correctly.

Dual-pump system

The Domusa SIRENA MIX DUO HFD boiler incorporates a dual-pump hydraulic circuit. One pump is dedicated to the heating circuit and the other to the primary circuit for DHW generation. This configuration separates both functions and is part of the design used by Domusa to ensure reliable operation and facilitate maintenance of the unit.

Included equipment

The SIRENA MIX DUO HFD 30 integrates most of the elements required for connection to a heating and DHW installation as standard, simplifying the installer’s work. Its equipment includes:

• Oil burner.
• Heating circulation pump.
• DHW primary pump.
• DHW production heat exchanger.
• Heating expansion vessel.
• Safety valve.
• Check valves.
• Automatic air vent.
• Filling valve.
• Drain valve.
• Flow switch.
• Flow switch.
• DHW flow limiter.
• Oil filter and burner connection hoses.

Quiet operation

Domusa designs the SIRENA HFD range as a family of sound-insulated oil boilers. The insulation applied to the boiler body and casing helps reduce noise generated during operation. The official energy label for the SIRENA MIX DUO HFD 30 declares a sound power level of 53 dB.

Easy installation

The factory integration of numerous hydraulic components makes installation easier and reduces the number of external elements that must be added to the system. The HFD 30 model uses 3/4" male connections for heating flow and return and 1/2" male connections for cold water inlet and DHW outlet.

In addition, Domusa indicates that the specific burner design of the SIRENA HFD 30 allows flue evacuation through an uninsulated 80 mm flue gas outlet system, even with certain horizontal sections, always in accordance with the manufacturer’s instructions and the regulations applicable to the installation.

Technical data of the Domusa SIRENA MIX DUO HFD 30

• Brand: Domusa Teknik.
• Range: SIRENA HFD.
• Model: SIRENA MIX DUO HFD 30.
• Reference: TSIRM00F12.
• Fuel: oil.
• Type: low-temperature boiler.
• Service: heating and instant DHW.
• Body material: cast iron.
• Nominal heat output: 29 kW.
• Useful heat output: 28.1 kW.
• Useful output at 30%: 8.9 kW.
• Seasonal heating energy efficiency: 86%.
• Energy class for heating: B.
• Energy class for DHW: B.
• DHW load profile: XL.
• DHW production: 13.4 liters/min at ΔT 30 °C.
• Maximum DHW temperature: 60 °C.
• Heating temperature regulation: 60-85 °C.
• Maximum safety temperature: 110 °C.
• Maximum heating circuit pressure: 3 bar.
• Expansion vessel capacity: 8 liters.
• Burner control: ON/OFF.
• Power supply: 220-230 V, 50 Hz.
• Electrical power: 200 W.
• Sound level: 53 dB.
• Heating connections: 3/4" male.
• DHW connections: 1/2" male.
• Approximate dimensions: 840 x 456 x 650 mm (height x width x depth).
• Gross weight: 122 kg.

A combi oil boiler for heating and hot water

Thanks to its 28.1 kW useful output, the Domusa SIRENA MIX DUO HFD 30 allows heating and instant domestic hot water production to be centralized in a single unit. Its cast iron body, dual-pump system and complete hydraulic equipment make it an alternative designed both for replacing old oil boilers and for new installations requiring a low-temperature boiler with integrated DHW.

As regulation options, the range supports accessories such as a time programmer and compatible room control solutions indicated by Domusa. The selection of accessories, hydraulic installation, flue gas evacuation and commissioning must be carried out in accordance with the manufacturer’s technical documentation and by qualified personnel.