Immergas HERCULES Condensing Boilers

HERCULES: High Sanitary Comfort and Maximum Performance

The new floor-standing boilers with integrated stainless steel tanks are designed to ensure high domestic hot water (DHW) production and immediate delivery. This makes them ideal for homes with high sanitary comfort needs.

The range offers various solutions for different system requirements:

• HERCULES MINI 35: Compact model with a 54-liter boiler.
• HERCULES 25, 35, and 35 ABT: Models with a 120-liter boiler, suitable for larger homes.
• HERCULES SOLAR 25: Features a 200-liter boiler and is "solar ready" with standard equipment for connection to solar thermal systems.

The HERCULES range meets modern family demands with highly efficient, performant, and smart solutions. They feature a wide modulation range (10% to 100% of power) for energy saving and a large-section condensing module to reduce clogging risk. All models are Class 6 (most ecological) and can achieve A+ energy classification when paired with an Immergas modulating room thermostat (e.g., SMARTECH PLUS, CARV2, or wireless room sensor + external probe).

Certified Hydrogen Ready, these boilers can operate with natural gas, LPG, propane air, and mixtures up to 20% hydrogen, offering a valid solution to reduce CO2 and greenhouse gas emissions.

New Elegant Design, High-Tech Electronics

Equipped with a closing dashboard door, a large, always-visible display, backlit touch buttons, and convenient knobs for adjustments. The display is well-illuminated and readable, and the touch buttons provide excellent tactile feedback, reflecting the product's high quality.

Ample System Flexibility and Reduced Electrical Consumption

Each circulator is low-consumption and features head regulation, allowing heating of different system zones with varying numbers of radiators or floor heating surfaces. The hydraulic compensator, present in all models, ensures maximum flow rate to each circuit.

WEB APP MYCODE

By scanning the QR code on the device's control panel with a smartphone, users can access all appliance information online: warranty expiry, authorized service center contacts, video tutorials, instruction manuals, certificates, and more. Authorized Immergas Service Centers also have access to specific post-sales technical support information.

General Features

Stainless Steel Primary Exchanger

The primary heat exchanger in the HERCULES boilers is made with a single-tube stainless steel coil. The absence of collectors and parallel circuits guarantees maximum reliability over time, as there are no welds. The single stainless steel spiral without constrictions ensures a perfectly balanced hydraulic circuit, significantly reducing pressure loss. Its large, constant internal section limits deposits, reducing clogging risks from water impurities (e.g., when replacing older boilers).

Stainless Steel Boiler

For over 30 years, Immergas has used high-performance stainless steel for its boilers, a company strength. Stainless steel ensures the boiler's resistance to water action, and the large flange optimizes cleaning and maintenance operations. The boiler's capacity, combined with excellent temperature regulation, ensures high sanitary comfort even with multiple simultaneous draws. The tank is prepared for connection to recirculation networks to provide immediate hot water to users.

Evolution in Thermoregulation

MULTI-zone Systems

In large single-family homes, system distribution can be managed by zone kits (for HERCULES and HERCULES SOLAR) or DIM ErP Multi-system Hydraulic Separators (for HERCULES MINI). Equipped with the latest generation electronics, the HERCULES range can manage up to 3 zones with the aid of a concentrator and wireless room sensors (both optional). Room temperatures and operating schedules are set directly from the boiler's control panel or remotely via app (phone, tablet, PC) with the DOMINUS V2 interface kit (optional). The boiler's circuit board includes a BMS communication port for connection to a ModBus-based home automation system.

MONO-zone Systems

These applications can be managed simply with SMARTECH PLUS (for app control) or with CARV2 or CRD PLUS (all optional).

Flue Systems

HERCULES boilers feature a dedicated series of air intake/flue exhaust kits designed for high corrosion resistance and quick, functional installation, thanks to the push-fit connection system and special sealing gaskets.

HERCULES boilers can be installed in sealed chamber/forced draft or open chamber/forced draft configurations.

Open Chamber, Forced Draft Configuration

Sealed Chamber, Forced Draft Configuration

*Further flue components (extensions, 90° bends, 45° bends, Ø 80/125 concentrics, lining systems, etc.) are available. For calculations considering offsets, bends, and special kits, refer to the boiler instruction manual.

Positive Pressure Collective Flue Ducts

Standard EN 15502 accounts for potential loss of seal in the main boiler clapet over time. A secondary safety clapet (optional code 3.031599) is required only for appliances connected to positive pressure collective flue ducts. The boiler's exit clapet prevents flue gas reflux into the room during heat exchanger module opening for maintenance.

Maximum Flue Duct Extensions for Positive Pressure Collective Flue Ducts (C10 and C12 configurations):

• Ø 80/125 flue ducts: 9 meters
• Ø 80/80 flue ducts: 10 meters

For further details, consult the appliance's instruction manual.

HERCULES 25/35/35 ABT

Floor-standing models with a 120-liter stainless steel boiler, prepared for zoned systems.

120-Liter Stainless Steel Boiler

The 120-liter boiler is entirely made of stainless steel. The double concentric spiral coils ensure maximum heat exchange, guaranteeing high volumes of domestic hot water and enabling rapid filling of bathtubs and maximum simultaneous draw-off by multiple users.

Immediate Domestic Hot Water Delivery

Boilers with tanks are prepared for connection to timed recirculation networks, which keep the DHW circulating to ensure it is immediately available at the taps.

Ideal for Solar Thermal Combination

The integrated 120-liter boiler is ready for combination with solar thermal collectors using an optional kit. This solution leverages a free renewable energy source to heat domestic water.

Sanitary Expansion Vessel Included

The capacity of the stainless steel boiler, combined with excellent temperature regulation, has earned it the *** marking according to EN 13203-1, signifying the highest sanitary performance.

Zoned and Mixed Systems

Thanks to optional kits installable directly inside the boiler, systems can be configured for up to 3 zones, with 2 being mixed-temperature zones. The HERCULES 35 ABT version is equipped as standard to manage one direct zone and one mixed zone.

• Kit Zona 2 Miscelata (Mixed Zone 2): For low-temperature and high-temperature zones. Code: 3.034699 (for HERCULES 25/35)
• Kit Zone 2 e 3 Miscelate (Mixed Zones 2 & 3): For two low-temperature and one high-temperature zone. Code: 3.034700 (for HERCULES 25/35)
• Kit Zona 3 Miscelata (Mixed Zone 3): For two low-temperature and one high-temperature zone. Code: 3.034701 (for HERCULES 35 ABT)
• Kit Zona 2 Diretta (Direct Zone 2): For two high-temperature or two direct low-temperature zones. Code: 3.034702 (for HERCULES 25/35)
• Kit Zone 2 e 3 Dirette (Direct Zones 2 & 3): For three high-temperature or three direct low-temperature zones. Code: 3.034703 (for HERCULES 25/35)

Minimum and maximum flow temperatures can be set directly from the boiler (temperature selection range: 20°C – 85°C). A single external probe (code 3.014083) can be connected for independent management of each heating zone. When the high-temperature zone circulator is off, the boiler automatically adjusts its flow temperature for the low-temperature zones.

Technical Data: HERCULES 25/35/35 ABT

Head (kPa) vs. Flow Rate (l/h) Graph

Dimensions and Connections: HERCULES 25/35

Dimensions and Connections: HERCULES 35 ABT

HERCULES MINI 35

Compact floor-standing model with a 54-liter stainless steel boiler.

Small Dimensions, Big Performance

Thanks to its compact dimensions, the HERCULES MINI 35 is easily installed in functional utility areas of the home. The hydraulic compensator ensures optimal water circulation in the heating system, making the MINI version ideal for systems with high heating circuit pressure drops and for replacements in older installations.

54-Liter Stainless Steel Boiler

Inside the boiler is a double concentric spiral stainless steel coil that ensures rapid heat exchange and allows for multiple draws. The tank is prepared for connection to timed recirculation networks, which keep the DHW circulating to ensure it is immediately available at the taps. A sanitary expansion vessel is included.

Sanitary Performance

The capacity of the stainless steel boiler, combined with excellent temperature regulation, has earned it the *** marking according to EN 13203-1, signifying the highest sanitary performance.

Technical Data: HERCULES MINI 35

Head (kPa) vs. Flow Rate (l/h) Graph

Dimensions and Connections: HERCULES MINI 35

HERCULES SOLAR 25

Floor-standing model with a 200-liter integrated stainless steel boiler and solar circuit.

Integrated Boiler-Solar Management

The hydraulic components for the solar thermal circuit (excluding the solar collector itself) are integrated within the boiler casing:

• 200-liter double-coil stainless steel boiler
• 12-liter solar expansion vessel
• 6 bar solar safety valve
• 1.6 l/min single circulation group
• 3/4" thermostatic mixing valve
• 12-liter sanitary expansion vessel
• 8 bar sanitary safety valve
• Insulated pipes between boiler and template connections for the collector

The electronic board also allows control of all parameters, eliminating the need for a dedicated control unit.

Technical Note: To complete the solar thermal system, add:

• 1 or 2 flat collectors with their connection kit.
• Support frame and fixing system for the flat collector (choose based on installation type: roof, recessed, or free-standing).
• Pre-mixed glycol for flat collectors.
• Connection pipes for collector and boiler.

Refer to specific documentation for this additional componentry. The list is indicative; always consult qualified professionals for system design and execution to ensure correct solar system sizing.

Zoned and Mixed Systems for HERCULES SOLAR 25

The HERCULES SOLAR 25 can be configured for systems up to 3 zones, with 2 being mixed-temperature zones, using optional kits installable directly inside the boiler.

• Kit Zona 2 Miscelata (Mixed Zone 2): For one low-temperature and one high-temperature zone. Code: 3.034699
• Kit Zone 2 e 3 Miscelate (Mixed Zones 2 & 3): For two low-temperature and one high-temperature zone. Code: 3.034700
• Kit Zona 2 Diretta (Direct Zone 2): For two high-temperature or two direct low-temperature zones. Code: 3.034702
• Kit Zone 2 e 3 Dirette (Direct Zones 2 & 3): For three high-temperature or three direct low-temperature zones. Code: 3.034703

Minimum and maximum flow temperatures can be set directly from the boiler (temperature selection range: 20°C – 85°C). A single external probe (code 3.014083) can be connected for independent management of each heating zone. When the high-temperature zone circulator is off, the boiler automatically adjusts its flow temperature for the low-temperature zones.

Technical Data: HERCULES SOLAR 25

Head (kPa) vs. Flow Rate (l/h) Graphs

Dimensions and Connections: HERCULES SOLAR 25

Thermoregulation Options

Pairing a thermoregulation device is an excellent investment, significantly increasing the system's seasonal energy efficiency.

Concentrator Kit with Wireless Room Sensor

Ideal for reading room temperature. Connect the concentrator via cable to the boiler and place the room sensor in the desired room. The two devices communicate via radio frequency.

• Concentrator: Code 3.030908
• Wireless Room Sensor Kit: Code 3.030906 (Dimensions: H 85 x W 105 x D 29 mm)

Expansion Sensor: Prepared to be paired with the concentrator kit, serving as an expansion for controlling additional zones.

DOMINUS V2 Interface Kit

Kit to remotely control the boiler via the DOMINUS V2 app (compatible only with wireless room sensors). The Wi-Fi transmitter kit is installed between a wireless modem/router (not supplied by Immergas) and the boiler.

• Kit DOMINUS V2: Code 3.034903 (Dimensions: H 113.5 x W 123.5 x D 33.5 mm)

CARV2 (Modulating Remote Control)

Backlit modulating chronothermostat for remote boiler control. Includes special functions like antifreeze temperature setting and anti-legionella function. Also available in WIRELESS version (code 3.021623).

• CARV2: Code 3.021395 (Dimensions: H 103 x W 142 x D 31 mm)

SMARTECH PLUS (SMART Chronothermostat)

Hi-tech wireless SMART chronothermostat with Bluetooth technology. Equipped with a gateway, wall mounting base (with integrated spirit level), table stand, and powered by 2 batteries (included). Transmission technology: Wi-Fi 802.11 b/g/n 2.4 GHz. Communication distance Thermostat - Gateway module: max 10 m*.

• SMARTECH PLUS: Code 3.030909 (Dimensions: Ø 71.5 x D 35.5 mm)
• SMARTECH PLUS Expansion Kit: For managing temperature in multiple zones (e.g., living and sleeping areas). Kit includes: additional SMART thermostat and Wi-Fi relay (requires home Wi-Fi network). Code: 3.031013
• SMARTECH PLUS Electrical Box Base Installation Kit: For covering wall holes for type 503 electrical boxes. Code: 3.034395 (Dimensions: Ø 70 x D 27 mm)

*Actual maximum distance may be shorter due to walls, ceilings, or obstacles between devices.

CRD PLUS

Modulating chronothermostat with remote boiler command functions, including antifreeze temperature setting.

• CRD PLUS: Code 3.032645 (Dimensions: H 85 x W 118 x D 30 mm)

CRONO 7

Backlit weekly ON-OFF digital chronothermostat. Also available in WIRELESS version (code 3.021624).

• CRONO 7: Code 3.021622 (Dimensions: H 103 x W 142 x D 31 mm)

External Probe

For variable temperature operation.

• External Probe: Code 3.014083 (Dimensions: H 140 x W 85 x D 44 mm)

GSM Phone Control

For buildings without a fixed telephone line.

• GSM Phone Control: Code 3.017182 (Dimensions: H 85 x W 85 x D 31 mm)

Telephone Control

For buildings with a fixed telephone line.

• Telephone Control: Code 3.013305

Zone Control Unit V2 Kit

Standard on ABT versions and zone kits. Control unit for external zone circulators/valves, managing 3 zones (2 mixed, 1 direct).

• Zone Control Unit V2 Kit: Code 3.030912

Configurable Relay Interface Kit

Installed inside the boiler, allows interface with external devices such as zone valves (with CARV2), remote alarm signals, external circulators, etc.

• Configurable Relay Interface Kit: Code 3.015350

Low Temperature Safety Thermostat Kit

For zones set to direct low temperature.

• Low Temperature Safety Thermostat Kit: Code 3.013794

Temperature Probe Kit for Solar Collector

For HERCULES SOLAR 25.

• Solar Collector Temperature Probe Kit: Code 1.028812

Optional Accessories

The extensive range of optional accessories includes specific completion items for boiler installation. Using original kits enhances product quality and reliability. Immergas accessories come with a two-year warranty through authorized service centers.

Zone System Kits (with low-consumption circulators)

• Kit Zona 2 Miscelata (Mixed Zone 2): (1 circulator, control unit, 1 three-way mixing valve, hydraulic fittings). For HERCULES 25/35 and SOLAR 25. Code: 3.034699
• Kit Zone 2 e 3 Miscelate (Mixed Zones 2 & 3): (2 circulators, control unit, 2 three-way mixing valves, hydraulic fittings). For HERCULES 25/35 and SOLAR 25. Code: 3.034700
• Kit Zona 3 Miscelata (Mixed Zone 3): (1 circulator, 1 three-way mixing valve, hydraulic fittings). Only for HERCULES 35 ABT. Code: 3.034701
• Kit Zona 2 Diretta (Direct Zone 2): (1 circulator, control unit, hydraulic fittings). For HERCULES 25/35 and SOLAR 25. Code: 3.034702
• Kit Zone 2 e 3 Dirette (Direct Zones 2 & 3): (2 circulators, control unit, hydraulic fittings). For HERCULES 25/35 and SOLAR 25. Code: 3.034703
• *Installed as standard on HERCULES 35 ABT.

Recirculation Kits (including circulator)

• For HERCULES 25/35. Note: The kit is fully contained within the boiler's dimensions. Code: 3.034707
• For HERCULES SOLAR 25. Note: The kit is fully contained within the boiler's dimensions. Code: 3.034708

Recirculation Probe Kits (without circulator)

• For HERCULES MINI 35. Code: 3.020259

Recirculation Timer Kit

For recirculation pump operation. Code: 3.015431

Electronic Anode Kit

• For HERCULES 25/35. Code: 3.030694
• For HERCULES SOLAR 25. Code: 3.029643

Condensate Drain Pump Kit

Compact condensate drain pump kit for floor-standing boilers. Use in case of adverse slope between siphon and drain. Can only be installed indoors. Dimensions: H 186 x W 110 x D 101 mm. Code: 3.026841

Condensate Neutralizer Kit

Use to neutralize condensate if not mixed with other domestic wastewater (ref. UNI 7129-5:2015). Cannot be installed outdoors. Dimensions: length 380 mm and Ø120 mm. Code: 3.019857

Polyphosphate Doser Kit

• For HERCULES 25/35. Code: 3.034709
• For HERCULES MINI 35. Code: 3.034711
• For HERCULES SOLAR 25. Code: 3.034710

Hydraulic Connection Kit

For solar collectors for HERCULES 25/35 (includes only pipes and fittings for connection to Immergas "BASIC SOL" solar packs). Code: 3.034706

Solar Connection Pipe Kit

For HERCULES SOLAR 25. For aligning the solar circuit in the template. Code: 3.021382

The HERCULES range is prepared for combination with DIM (Multi-system Hydraulic Separators), available in built-in or wall-mounted versions. For information, consult documentation downloadable from immergas.com.

10FORMULA COMFORT: Complete Warranty Up to 15 Years

With the "Passa al Nuovo" initiative, boilers with power less than 35 kW can have 10 years of warranty without activation costs. The warranty can be extended up to 15 years.

• Warranty Extension: After the initial 10 years of Formula Comfort, the warranty can be extended by another 5 years.
• Free Intervention and Labor: Fixed call-out fee is free, and labor costs are not charged in case of faults.
• 7 Days a Week Service: Free service 7 days a week, with assistance even on Sunday mornings from October to February.
• Annual Maintenance and Biennial Flue Gas Test: Ensures routine maintenance and combustion product analysis.
• Within 24 Hours: Priority for urgent calls with prompt interventions within 24 hours.
• Use of Original Spare Parts: Replacement of components with original spare parts, at no cost.

Accessing the benefits of Formula Comfort 10 Years is simple: just sign up for the maintenance program with an Authorized Immergas Technical Service Center.

Toll-free number: 800 306 306 | immergas.com

Contact and Certification

Immergas S.p.A. 42041 Brescello (RE) - Italy

Tel. 0522.689011

For specific in-depth information, industry professionals can also use the email address: consulenza@immergas.com

immergas.com

QUALITY SYSTEM CERTIFIED

UNI EN ISO 9001:2015

Design, manufacturing, and after-sales service of gas boilers, gas water heaters, and related accessories.

Immergas reserves the right to make any modifications deemed useful for product evolution to its models without prior notice.

AP.000611-000 (ver. 625) - 03/25 - Grafiche Pioppi - Scandiano (RE) aicod.it