1. Important Safety Instructions
Please read all instructions carefully before installing or operating the ACTIVA Heat-Max 25L Storage Water Heater. Retain this manual for future reference.
- Ensure water supply is connected and the tank is completely full before turning on the geyser.
- Only switch on the geyser after it is filled with water.
- Installation must be performed by a skilled electrician to ensure safety and proper functioning. Do not attempt to install the geyser yourself.
- Keep the area around the geyser clear of any flammable materials.
- Turn off the power supply to the geyser when it is not in use or during maintenance.
- Install the geyser at the appropriate height on the wall as per installation guidelines.
- The hexagonal safety valve (pressure relief valve) fitted on the inlet pipe coupling will manage any positive pressure exceeding 3.5 kg/cm² (50 p.s.i.) by opening and dripping.
- For hydro-pneumatic water pump systems or overhead tanks exceeding 18 meters, a PRESSURE REDUCING VALVE must be fitted in the inlet pipe to protect the water heater from excessive pressure.

2. Product Overview
The ACTIVA Heat-Max 25L Storage Water Heater is designed for efficient and reliable hot water supply. It features a 25-liter capacity, 2 KVA power, and a BEE 5-Star rating for energy efficiency. The unit includes a durable 0.8mm stainless steel tank with a special anti-rust coating, a digital display, and is suitable for high-rise buildings due to its multi-functional valve (MFV) capable of withstanding up to 8 bar pressure.


3. Installation
The ACTIVA Heat-Max geyser is designed for wall mounting. For safe and correct installation, it is mandatory to have the unit installed by a qualified electrician or plumber.
3.1 Included Components
- ACTIVA Heat-Max 25L Storage Water Heater Unit
- ISI Wire with Inbuilt ISI 3 Pin Plug
- Installation Kit (includes mounting bolts and flexible pipes)
3.2 Installation Steps (Summary - Professional Installation Required)
- Site Selection: Choose a suitable wall location, ensuring it can support the geyser's weight when full and is near water and power connections. Refer to product dimensions for space planning.
- Mounting: Securely mount the geyser to the wall using the provided installation kit.
- Water Connections: Connect the inlet and outlet pipes. Ensure the multi-functional valve (MFV) is correctly installed on the inlet side, especially for high-rise buildings or pressure pump applications.
- Electrical Connection: Connect the geyser to a suitable power outlet using the ISI wire and 3-pin plug. Ensure the power supply matches the geyser's requirements (220 Volts AC).
- Filling the Tank: Before switching on, open both inlet and outlet water taps to allow the geyser to fill completely. Water should flow freely from the outlet tap, indicating the tank is full and air pockets are removed.


4. Operating Instructions
Once the geyser is correctly installed and filled with water, you can begin operation.
- Initial Start-up: Ensure the water heater is completely full by opening both the inlet and outlet valves until water flows steadily from the outlet.
- Power On: Switch on the power supply to the geyser. The red indicator light will illuminate, signifying that the heating element is active.
- Temperature Setting: Use the digital display and temperature control buttons to set your desired water temperature. The display will show the actual water temperature.
- Heating Process: The geyser will begin heating the water. The red indicator light will remain on during heating.
- Temperature Achieved: Once the set temperature is reached, the thermostat will automatically switch off the power supply to the heating element. The red indicator light will turn off, and the green indicator light will illuminate, indicating that the water is hot and ready for use.
- Using Hot Water: Close the inlet valve while operating the water heater to prevent cold water from mixing with the hot water in the tank.
- Thermostat Failure: In the rare event of thermostat failure, the thermal cutout provides protection against dry heating of the element and excessive heating. The geyser includes an inbuilt service alarm system. If an alarm is triggered, immediately switch off the power supply and contact customer support for calibration.

5. Key Features
The ACTIVA Heat-Max 25L Storage Water Heater incorporates several advanced features for performance, durability, and safety:
- Advanced Capillary Thermostat: Equipped with multiple temperature control settings, allowing users to adjust the heat level according to comfort and seasonal requirements.
- Digital Display: A stylish digital display panel shows the actual water temperature, providing precise control and monitoring.
- Multi-Functional Valve (MFV) for High-Rise Buildings: Specifically designed with an MFV that can withstand pressure up to 8 bar, making it suitable for high-rise buildings and pressure pump applications.
- BEE 5-Star Rated: Certified energy-efficient product (valid from 1st Jan 2023 to 31st Dec 2025), ensuring trusted performance and verified energy-saving compliance.
- Extra Thick Sacrificial Magnesium Anode: The magnesium anode rod acts as an additional layer of protection against corrosion, prolonging the water heater's lifespan.
- Powerful Extra Thick Heating Element: A 2000 Watt high-quality, extra-thick heating element ensures fast water heating, providing hot water efficiently.
- Seven Tank Processed Sheet Metal Body: The geyser features a seven-tank processed sheet metal powder-coated body with ABS top and bottom, protecting it from rust and corrosion.
- Glassline Tank for Longer Durability: The inner tank is constructed with a glassline coating, which protects the geyser from the effects of hard water and ensures a longer operational life.





6. Specifications
| Feature | Specification |
|---|---|
| Brand | ACTIVA |
| Model Number | Heat-Max |
| Capacity | 25 Litres |
| Wattage | 2000 Watts (2 KVA) |
| Voltage | 220 Volts (AC) |
| Energy Efficiency | BEE 5-Star Rated |
| Maximum Operating Pressure | 8 Bars |
| Tank Material | 0.8 mm Heavy-Duty Stainless Steel with Glassline Coating |
| Body Material | Seven Tank Processed Sheet Metal Powder Coated Body with ABS Top and Bottom |
| Special Features | Digital Display Panel, High Rise Building Compatible (MFV), Special Anti-Rust Coating, Advanced Capillary Thermostat, Sacrificial Magnesium Anode |
| Mounting Type | Wall |
| Colour | White |
| Product Dimensions (LxWxH) | 36 x 39 x 50 cm |
| Item Weight | 9.01 kg |
| Included Components | ISI Wire With Inbuilt ISI 3 Pin, Installation kit |
| Country of Origin | India |
7. Maintenance
Regular maintenance ensures the longevity and efficient operation of your ACTIVA Heat-Max water heater.
- Regular Cleaning: Periodically wipe the exterior of the geyser with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Anode Rod Inspection: The sacrificial magnesium anode rod should be inspected annually by a qualified technician and replaced if significantly depleted. This protects the tank from corrosion.
- Pressure Relief Valve Check: Periodically check the pressure relief valve for any blockages or leaks. Ensure it is functioning correctly.
- Drainage: If the geyser is not to be used for an extended period, it is advisable to drain the tank to prevent water stagnation and potential damage. Consult a technician for proper drainage procedures.
- Professional Servicing: It is recommended to have the geyser professionally serviced at least once every two years to ensure all components are in good working order.
8. Troubleshooting
If you encounter any issues with your ACTIVA Heat-Max water heater, refer to the following common troubleshooting steps. For complex problems, contact customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| No hot water / Water not heating | No power supply, thermostat setting too low, heating element failure, thermal cutout activated. | Check power connection and circuit breaker. Adjust thermostat to a higher temperature. If problem persists, contact service. |
| Water is not hot enough | Thermostat set too low, insufficient heating time, excessive hot water usage. | Increase thermostat setting. Allow more time for heating. Reduce simultaneous hot water usage. |
| Water leakage | Loose connections, faulty pressure relief valve, tank damage. | Immediately turn off power and water supply. Check pipe connections for tightness. If leakage continues, contact service. |
| Digital display not working | Electrical fault, display unit malfunction. | Check power supply. If display remains off, contact service. |
| Red/Green indicator lights not working | Indicator bulb failure, electrical issue. | While the geyser may still function, contact service for repair of indicator lights. |
9. Warranty and Support
The ACTIVA Heat-Max 25L Storage Water Heater comes with a 5-year warranty, ensuring peace of mind regarding product quality and performance.
9.1 Warranty Claims and Product Support
For warranty claims, technical assistance, or any product-related issues, please contact ACTIVA customer support:
- Email: info@activaappliances.com
- Phone: 9999427599
- Manufacturer: TECHVISION INTERNATIONAL PVT. LTD. INDIA
Please have your product model number (Heat-Max) and purchase details ready when contacting support to facilitate quicker service.





