Ranein Electric Mini Tank Water Heater WarmCube 8 User Manual

1. Introduction

This manual provides essential information for the safe and efficient operation, installation, and maintenance of your Ranein Electric Mini Tank Water Heater, Model WarmCube 8. Please read this manual thoroughly before installation and use, and retain it for future reference.

The Ranein WarmCube 8 is an 8-gallon point-of-use electric water heater designed to provide instant hot water for various applications, including kitchens, bathrooms, and RVs. It operates on 120V with a 1440W heating element.

Figure 1: Ranein WarmCube 8 Electric Mini Tank Water Heater. This image shows the compact, white unit with a central control knob and the Ranein logo.

2. Safety Information

WARNING: Failure to follow these safety instructions could result in property damage, serious injury, or death.

• Ensure the unit is installed by a qualified professional in accordance with all local plumbing and electrical codes.
• Do not operate the water heater if it is damaged or malfunctioning.
• Always disconnect power before performing any maintenance or service.
• The unit is equipped with dry-burn protection and an advanced leakage prevention system (auto-cutoff in <0.1s) for enhanced safety. However, regular inspection is recommended.
• The maximum operating temperature is 185°F (85°C). Exercise caution to prevent scalding.
• The unit has an IPX4 waterproof rating, indicating resistance to splashing water, but it should not be submerged.
• Ensure proper grounding to prevent electrical shock.
• Do not block the pressure relief valve.

Figure 2: Multiple Protection Features. This diagram highlights the water heater's safety features, including high temperature resistance, corrosion resistance, high pressure resistance, dry burning resistance, IPX4 waterproof rating, and leakage resistance.

3. Product Overview

The Ranein WarmCube 8 is designed for efficiency and durability, featuring:

• Instant Hot Water: 8-gallon capacity provides hot water on demand, ideal for point-of-use applications.
• Durable Construction: Equipped with a stainless steel inner tank for corrosion resistance and extended lifespan.
• Efficient Heating: 1440W heating element ensures rapid water heating.
• Advanced Insulation: Triple-layer design with enamel coating, high-density insulation foam, and reinforced decarburized steel plate for superior heat preservation and reduced energy loss.
• Adjustable Thermostat: Precision control for desired water temperature up to 185°F (85°C).
• Safety Features: Includes high-temperature resistance, high-pressure resistance (up to 1.0 MPa), dry-burn protection, IPX4 waterproof rating, and an advanced leakage prevention system.

Figure 3: Key Features Summary. This graphic illustrates the water heater's 24-hour timer function, 1440W high power, multiple protection systems, 55-145°F temperature range, easy installation options, 3D foam insulation, and energy-saving design.

Figure 4: 3-Layer Inner Liner. This image shows a cross-section of the tank, detailing the enamel layer, density layer, and decarburized steel plate layer, which contribute to its durability and heat preservation.

4. Setup and Installation

The Ranein WarmCube 8 offers versatile installation options, including under-sink, wall-mounted, or floor-mounted setups. Ensure adequate clearance and proper plumbing and electrical connections.

4.1 Site Selection

• Choose a location that is easily accessible for maintenance and protected from freezing temperatures.
• Ensure the mounting surface (if wall-mounted) can support the weight of the unit when full (approximately 8 gallons of water + unit weight).
• Verify sufficient space for installation and future servicing.

Figure 5: Under-Sink Space Confirmation. This image illustrates the minimum clearance required for under-sink installation: minimum 5 inches above the unit, and minimum 2 inches on the sides.

4.2 Plumbing Connections

1. Connect the cold water inlet to the designated port on the water heater.
2. Connect the hot water outlet to your fixture's hot water line.
3. Install a temperature and pressure relief (T&P) valve as required by local codes.
4. Flush the tank with water before connecting to power to remove any air and ensure no leaks.

4.3 Electrical Connections

• The unit operates on a standard 120V outlet. Ensure the circuit can handle the 1440W load.
• Plug the water heater into a properly grounded electrical outlet.

Figure 6: Multiple Installation Options. This image displays the water heater installed under a sink and mounted on a wall, demonstrating its flexibility for various spaces.

5. Operating Instructions

Once installed and filled with water, the Ranein WarmCube 8 is ready for operation.

5.1 Initial Startup

1. Ensure the tank is completely filled with water before plugging in the unit. Open a hot water faucet to allow air to escape until water flows steadily.
2. Plug the unit into a grounded 120V outlet. The heating indicator light will illuminate.

5.2 Temperature Adjustment

The water heater features a precision adjustable thermostat. Use the control knob on the front of the unit to set your desired water temperature.

• Turn the knob clockwise to increase the temperature.
• Turn the knob counter-clockwise to decrease the temperature or turn the unit off.
• The temperature range is typically 55°F to 145°F (13°C to 63°C), with a maximum internal temperature capability of 185°F (85°C).

Figure 7: Temperature Knob Adjustment. This image shows the control knob and suggests optimal temperatures for different uses: 107°F for washing dishes, 104°F for washing vegetables, 98°F for brushing teeth, and 89°F for washing face.

5.3 Daily Use

The unit will automatically heat water to the set temperature and maintain it. Hot water will be available instantly at your point of use.

6. Maintenance

Regular maintenance ensures optimal performance and extends the lifespan of your water heater.

• Annual Flushing: Drain and flush the tank annually to remove sediment buildup. Disconnect power before draining.
• T&P Valve Check: Test the temperature and pressure relief valve at least once a year by lifting the lever. Ensure water flows freely and the valve reseats properly.
• Exterior Cleaning: Clean the exterior with a damp cloth. Do not use abrasive cleaners.
• Inspection: Periodically inspect for any signs of leaks, corrosion, or damage to the power cord.

7. Troubleshooting

Refer to the following table for common issues and their solutions.

If the problem persists after attempting these solutions, please contact customer support.

8. Specifications

Figure 8: Product Parameters. This image provides a visual representation of the water heater's dimensions and a table summarizing key specifications including capacity, voltage, power, max water pressure, weight, amperage, and waterproof grade.

9. Warranty and Support

For warranty information and customer support, please refer to the documentation included with your product or visit the official Ranein website. Keep your purchase receipt as proof of purchase for warranty claims.

For technical assistance or service inquiries, please contact Ranein customer service.