Palazzetti Ecofire Dadò Idro 20 TC: 20 kW sealed hydro pellet stove

Palazzetti Ecofire Dadò Idro 20 TC is a 20 kW sealed hydro pellet stove designed to transfer almost all of its useful heat to a central-heating water circuit.

From a total nominal output of 20 kW, up to 18.9 kW is delivered to the heating water, making Dadò Idro 20 particularly suitable for systems where pellet energy is primarily required for radiators, fan coils, compatible radiant heating or thermal storage.

The stove also features an extra-large 45 kg pellet hopper, integrated hydronic components and automatic combustion and cleaning systems.

Key features of Palazzetti Dadò Idro 20 TC

• 20 kW nominal heat output.
• 18.9 kW nominal output to water.
• Minimum total output approximately 4.6 kW.
• Minimum water output approximately 3.9 kW.
• CC50 sealed combustion.
• Direct outdoor combustion-air supply capability.
• Painted-steel cladding.
• Double-door design.
• Balanced Door.
• Integrated hydronic unit.
• Integrated anti-condensation valve.
• Digital touch control panel.
• Universal Gateway ready.
• Complete Burning System.
• Self Cleaning System for burn pot and heat-exchanger tubes.
• Star pellet-feed system.
• 45 kg extra-large pellet hopper.
• Pellet consumption approximately 1 - 4.39 kg/h.
• Maximum indicative operating time of approximately 45 hours.
• A++ energy class.
• Italian 5-star environmental rating.

20 kW total output and 18.9 kW to water

When selecting a hydro pellet stove, it is essential to distinguish between total useful heat output and the amount transferred to the heating-water circuit.

Dadò Idro 20 TC operates from approximately 4.6 to 20 kW total output, while water output ranges from approximately 3.9 to 18.9 kW.

At nominal output, approximately 95% of the useful heat is therefore transferred to the hydronic heating system.

Hydro heating without a dedicated room fan

Dadò Idro 20 TC is primarily designed to heat the water of a central-heating system.

There is no dedicated room-air fan. Most of the useful heat is transferred to the water circuit, while a smaller proportion is naturally released into the installation room through the appliance body.

Depending on system design, it can be connected to radiators, fan coils, compatible radiant-heating systems, thermal storage and integrated multi-source heating systems.

Extra-large 45 kg pellet hopper

The Dadò range features an extra-large 45 kg pellet hopper, equivalent to approximately three standard 15 kg bags.

With pellet consumption ranging from approximately 1 to 4.39 kg/h, maximum indicative operating time can reach around 45 hours at minimum output.

CC50 sealed combustion: what does it mean?

Dadò Idro 20 TC is a CC50 certified sealed pellet stove.

CC50 means that combustion-chamber airtightness is verified at a pressure difference of up to 50 Pa according to EN 16510.

Combustion air can therefore be supplied directly from outdoors rather than being taken from the installation room.

This is particularly relevant in modern well-insulated, low-energy buildings and homes equipped with controlled mechanical ventilation. Installation compatibility must always be assessed by a qualified installer.

Double door and Balanced Door

Dadò TC features a double-door arrangement, with an aesthetic glass outer door and a technical combustion-chamber door.

The technical door incorporates the Balanced Door self-balancing mechanism.

Integrated hydronic unit

Dadò Idro 20 TC includes an integrated hydronic unit designed to simplify connection to the heating system.

The unit includes a circulation pump, safety valve, closed expansion vessel and pressure gauge.

Correct system design is still required, including water volume, heating emitters, operating temperatures, thermal storage and any additional safety and control components.

Integrated anti-condensation valve

An integrated anti-condensation valve assists correct management of the return-water temperature and helps limit operating conditions that could promote condensation inside the heat exchanger.

Self Cleaning System

The Self Cleaning System automatically cleans both the pellet burn pot and the heat-exchanger tubes.

This helps maintain consistent heat transfer and reduce routine manual intervention, although scheduled maintenance remains necessary.

Complete Burning System

The Complete Burning System promotes more complete combustion of residual material, helping reduce ash production and improve fuel utilisation.

Star pellet-feed system

Palazzetti's Star pellet-feed system precisely meters the fuel supplied to the burn pot, helping maintain consistent combustion at different output levels.

Controls and smart compatibility

Dadò Idro 20 TC features a digital touch control panel for the main operating parameters.

The stove is also designed for the optional Universal Gateway, providing access to compatible Palazzetti smart functions.

My Cli-Mate+ and Shape+ require Universal Gateway or MyDisplay+.

Performance and pellet consumption

Dadò Idro 20 TC provides approximately 4.6 to 20 kW total useful heat output and approximately 3.9 to 18.9 kW water output.

The 2027 Palazzetti price list specifies 94% efficiency, while detailed technical documentation reports approximately 94.7% at nominal output.

Pellet consumption ranges from approximately 1 to 4.39 kg/h.

Palazzetti Ecofire Dadò Idro 20 TC technical specifications

Installation and hydronic system sizing

Dadò Idro 20 TC must be connected to a correctly designed hydronic heating system and a suitable chimney.

Although the hydronic unit and anti-condensation valve are integrated, system design must still consider building heat demand, water volume, heating emitters, flow and return temperatures, thermal storage and any additional heat generators.

With 18.9 kW available to the water circuit, avoiding oversizing is particularly important. Selection should be based on the actual hydronic heat demand rather than floor area alone.

A++ energy class, 5-star rating and incentives

Palazzetti Ecofire Dadò Idro 20 TC is rated A++ and achieves the Italian 5-star environmental rating under D.M. 186.

Palazzetti documentation refers to Conto Termico 3.0 for Dadò Idro 20 TC. Eligibility depends on the type of project, the appliance being replaced and compliance with all applicable technical and administrative requirements.

For further information, see our guide to Conto Termico 3.0 and incentives for biomass heating appliances.