18Kw 220V-240V Bathroom Electric Instant Shower Tankless Water Heater

MR.NIU 18Kw 220V-240V Multi-Point Instant Water Heater: Full Specifications

1. General Information

• Product Type: Tankless Electric Instant Water Heater

• Model Example: (e.g., MR.NIU MN-18KW) [Note: Exact model number may vary]

• Primary Use: Providing continuous hot water for multiple outlets (bathroom sink, shower, kitchen sink) in applications like hotels, apartments, or large homes.

• Installation: Wall-mounted, indoor. Must be installed on a vertical water pipe.

2. Electrical Specifications

• Rated Power: 18,000 Watts (18 kW)

• Voltage: 220-240 Volts AC

• Phase: Single-Phase

• Current Draw: Approximately 75-82 Amps (at 220V)

• Required Circuit: Requires a dedicated 100-Amp circuit breaker (minimum) due to the high inrush current. This is a critical installation requirement.

• Wiring: Must be connected with heavy-gauge electrical cable (e.g., 6 AWG or larger copper wire) as per local electrical codes.

• IP Rating: Typically IP25 (Splash-proof from water falling at a 60° angle). This means it is safe for bathroom installation but should not be directly sprayed or submerged.

3. Water & Performance Specifications

• Water Pressure: 0.05 MPa - 0.6 MPa (approx. 7 PSI - 87 PSI)

• Minimum Flow Rate: Typically ~1.2-1.5 L/min to activate heating.

• Heating Capacity: Approximately 4.5 - 5.5 Liters per minute (varies based on inlet water temperature).

  • Example: Raising water temperature by 25°C (45°F).

• Maximum Outlet Temperature: Adjustable, usually up to 55-60°C (131-140°F).

• Inlet/Outlet Connections: Typically ½ inch or ¾ inch BSP (British Standard Pipe) or NPT (National Pipe Thread) fittings. Check product specifics.

4. Physical Specifications

• Dimensions (H x W x D): Approximately 500mm x 330mm x 155mm (19.7" x 13" x 6.1"). Size can vary slightly by model.

• Weight: Approximately 6-8 kg (13-18 lbs).

• Housing Material: Typically high-impact, heat-resistant plastic (PP).

• Heating Element: 3 x 6kW Incoloy or Stainless Steel Heating Tubes. They heat up instantly and are highly resistant to scaling and corrosion.

• Display: Usually a simple LED digital display showing set temperature and error codes.

5. Technical Features & Safety Protections

• Multi-Point Use: Can supply hot water to several outlets simultaneously (e.g., shower and sink).

• Adjustable Temperature: Digital thermostat control for precise temperature setting.

• Safety Features:

  • IP25 Splash Proof Rating: Safe for bathroom environments.

  • Thermal Overheat Protection: Automatically cuts power if temperature exceeds safe limits.

  • Dry Heating Protection: Will not activate if there is no water flow.

  • High/Low Water Pressure Protection: Safeguards the unit from pressure extremes.

  • Leakage Protection: Integrated Earth Leakage Circuit Breaker (ELCB) or requires an external one.

  • Frost Protection: Some models have an anti-freezing mode for cold climates.

• Efficiency: 99%+ Energy Efficient. Only heats water when needed, eliminating standby heat loss associated with tank heaters.

6. Installation Requirements

• Professional Installation is MANDATORY. Due to the very high electrical load and plumbing requirements, this is not a DIY product.

• Electrical: A dedicated 100A circuit from the main electrical panel is required.

• Plumbing: Must be installed by a qualified plumber. Requires correct water pressure and may need a water softener in hard water areas to prevent limescale buildup.

• Environment: Must be installed in a well-ventilated area. There must be no risk of freezing.

7. Advantages

• Endless Hot Water: Provides a continuous supply of hot water.

• Space Saving: Compact, wall-mounted design.

• Energy Saving: Only uses electricity when water is flowing.

• Multi-Outlet: Can run more than one fixture at a time.

8. Important Considerations

• High Power Demand: Requires a significant upgrade to most home electrical systems (100A dedicated circuit).

• Flow Rate Limitation: While endless, the flow rate is limited. Using two showers simultaneously may reduce the overall water temperature if the total flow exceeds the heater's capacity.

• Water Hardness: Limescale buildup can severely reduce efficiency and damage the unit in areas with hard water. A water softener is highly recommended.