Palazzetti Ecofire Tiffany Idro V21 TC US: 20.5 kW slim hydro pellet stove with top coaxial connection

Palazzetti Ecofire Tiffany Idro V21 TC US is a 20.5 kW sealed fan-assisted hydro pellet stove designed to transfer most of its useful heat to a central-heating water circuit while also providing direct room heating.

The TC US – Upper Smoke configuration uses a top coaxial connection for flue-gas evacuation and combustion-air intake.

At rated output, the stove delivers up to 19 kW to the heating-water circuit from a total nominal output of 20.5 kW.

With a depth of only 36 cm, Tiffany Idro TC US is particularly suitable for narrow rooms, hallways and installations where rear space is limited.

Key features of Palazzetti Tiffany Idro V21 TC US

• 20.5 kW nominal heat output.
• 19 kW nominal output to water.
• CC50 sealed combustion.
• Top coaxial flue and combustion-air connection.
• Hydronic heating plus fan-assisted room heating.
• Only 36 cm deep.
• Painted-steel cladding.
• Double-glazed door with black tempered aesthetic glass.
• Balanced Door.
• Integrated hydronic unit.
• Integrated anti-condensation valve.
• Digital control display.
• Universal Gateway ready.
• Complete Burning System.
• Self Cleaning System for burn pot and heat-exchanger tubes.
• Speedy Clean.
• 30 kg pellet hopper.
• Pellet consumption from 0.91 to 4.51 kg/h.
• A++ energy class.
• Italian 5-star environmental rating.

20.5 kW total output and 19 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.

Tiffany Idro V21 TC US provides 20.5 kW total nominal output, of which approximately 19 kW is transferred to water.

This makes it particularly suitable for central-heating systems with relatively high heat demand.

TC US top coaxial connection

The US – Upper Smoke configuration places the chimney connection at the top of the appliance.

The coaxial arrangement integrates flue-gas evacuation and combustion-air intake into the same upper connection system.

This is particularly useful on a slim appliance because it helps minimise rear installation space.

Slim 36 cm design

Tiffany Idro V21 TC US measures approximately 101 × 36 × 116 cm.

Its shallow body allows installation in narrow rooms and passage areas, subject to the manufacturer's required safety clearances.

CC50 sealed combustion

Tiffany Idro V21 TC US 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.

Hydro heating with fan-assisted room heating

Tiffany Idro V21 TC US heats the technical water of a compatible central-heating system while also distributing warm air into the installation room.

Depending on system design, it can be integrated with radiators, fan coils, compatible radiant heating, thermal storage and other heat generators.

Domestic hot-water production requires a separate correctly designed system with a suitable cylinder, storage tank or heat exchanger.

Integrated hydronic unit

The appliance includes an integrated hydronic unit with circulation pump, safety valve, closed expansion vessel and pressure gauge.

The complete system must nevertheless be correctly designed according to heat demand, water volume, emitters, operating temperatures and any thermal storage.

Integrated anti-condensation valve

An integrated anti-condensation valve helps manage return-water temperatures and reduce 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, helping maintain consistent heat transfer and reduce routine manual intervention.

Complete Burning System

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

Speedy Clean and Balanced Door

The large ash collection drawer and Speedy Clean system simplify routine cleaning operations.

The Balanced Door self-balancing mechanism is designed to maintain correct combustion-chamber closure during temperature changes.

Performance and pellet consumption

Tiffany Idro V21 TC US delivers a 20.5 kW nominal heat output, with approximately 19 kW transferred to water.

The 2027 Palazzetti price list specifies approximately 94% efficiency.

Pellet consumption ranges from approximately 0.91 to 4.51 kg/h, while the hopper holds 30 kg of pellet.

Palazzetti Ecofire Tiffany Idro V21 TC US technical specifications

Installation and coaxial chimney system

Tiffany Idro V21 TC US must be connected to a correctly designed hydronic heating system and a chimney suitable for its certified coaxial configuration.

With approximately 19 kW delivered to water, correct system sizing is especially important, including water volume, heating emitters, return temperatures, control strategy and any thermal storage.

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

Palazzetti Ecofire Tiffany Idro V21 TC US is rated A++ and achieves the Italian 5-star environmental rating under D.M. 186.

Palazzetti documentation refers to Conto Termico for Tiffany Idro V21 TC US. Eligibility for Conto Termico 3.0 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.