ThermoMate 3500W 120V Tankless Electric Water Heater

Introduction

This instruction manual provides comprehensive information for the safe and efficient installation, operation, and maintenance of your ThermoMate 3500W 120V Tankless Electric Water Heater. Designed for point-of-use applications, this compact unit delivers instant hot water, making it ideal for single sink faucets in various settings. Please read this manual thoroughly before installation and use to ensure optimal performance and longevity of your appliance.

Figure 1: Front view of the ThermoMate Tankless Electric Water Heater.

Safety Information

WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death. Read this manual thoroughly before installing or servicing this equipment.

• This appliance must be installed by a qualified electrician and plumber in accordance with all local electrical and plumbing codes.
• Ensure the power supply is disconnected before performing any installation or maintenance.
• The unit requires a 3.5kW 120V ONLY Hardwired connection, necessitating a 32A Double Pole Circuit Breaker and a minimum 10AWG wire size.
• Water connections are standard 1/2" NPT. Ensure all connections are watertight to prevent leaks.
• Do not operate the water heater if it is damaged or malfunctioning.
• This unit is designed for indoor use only and must be protected from freezing temperatures.
• The appliance features overheat protection and a leak-proof heating chamber for enhanced safety.

Product Overview

Key Features:

• Instant Hot Water: Provides on-demand hot water in seconds for point-of-use applications.
• Self-Modulating Power: Regulates energy consumption efficiently, heating water only when needed with 99.8% efficiency.
• Durable Construction: Features a cast aluminum heating element separated from the water line to reduce scale and corrosion, and a SUS 304 stainless steel water tube.
• Compact Design: Small footprint (7.9" x 6.4" x 2.5") allows for installation in tight spaces like under cabinets or sinks.
• User-Friendly Interface: Touch control panel with a digital temperature display for precise temperature adjustments (86°F - 131°F).
• ETL Certified: Ensures compliance with safety standards.
• IP25 Waterproof: Provides protection against water splashes.

Figure 2: Key features and certifications.

Figure 3: Compact design for point-of-use applications.

Specifications

Figure 4: Product dimensions and key specifications.

Installation

Installation of the ThermoMate tankless water heater requires both electrical and plumbing expertise. It is highly recommended that installation be performed by a licensed professional to ensure safety and compliance with all local codes.

Pre-Installation Checklist:

• Verify that your electrical system can support a 3.5kW 120V appliance, requiring a dedicated 32A Double Pole Circuit Breaker and 10AWG minimum wire size.
• Ensure adequate space for the unit (7.9" x 6.4" x 2.5") and accessibility for future maintenance.
• Confirm water supply lines are ready for 1/2" NPT connections.
• Gather necessary tools: drill, level, measuring tape, pipe wrench, wire strippers, screwdriver.

Mounting and Connections:

1. Select a suitable wall location, preferably near the point of use (e.g., under or over a sink). The unit is designed for vertical installation.
2. Use the provided mounting kit to securely attach the unit to the wall. Ensure it is level.
3. Connect the cold water inlet (blue marking) and hot water outlet (red marking) to your plumbing system using 1/2" NPT fittings.
4. Perform electrical hardwiring according to local codes, connecting the unit to the dedicated 32A double pole circuit breaker with 10AWG wire.
5. Before powering on, flush the system to remove any air and check for leaks.

Figure 5: Under/Over Sink Vertical Installation examples.

Figure 6: Sizing guide and technical specifications for installation planning.

Operation

Once properly installed and powered, your ThermoMate tankless water heater is ready for use. The unit operates on a self-modulating system, adjusting power consumption based on demand to provide consistent hot water.

Setting Temperature:

• The digital display on the front of the unit shows the current outlet water temperature.
• Use the touch control panel to adjust the desired temperature within the range of 86°F to 131°F. Adjustments can be made in 1° increments.
• The unit will maintain the set temperature as water flows through it, provided the flow rate is within the specified range of 0.4 GPM to 0.66 GPM.
• The unit has a 24-hour standby mode for immediate hot water availability.

Figure 7: Applications for instant hot water.

Maintenance

The ThermoMate tankless water heater is designed for low maintenance. Its cast aluminum heating element is separated from the water line, which significantly reduces the buildup of scale, corrosion, and minerals, contributing to a longer service life and leak-free operation.

Recommended Maintenance:

• Periodic Inspection: Annually inspect the unit and all connections for any signs of leaks, corrosion, or damage.
• Cleaning: Wipe the exterior of the unit with a soft, damp cloth. Do not use abrasive cleaners or solvents.
• Water Quality: In areas with hard water, consider installing a water softener to further minimize mineral buildup, although the unit's design already mitigates this issue.
• Winterization: If the unit is installed in an unheated area subject to freezing temperatures, it must be drained completely to prevent damage.

Figure 8: Internal design for reduced maintenance.

Troubleshooting

This section provides solutions to common issues you might encounter with your ThermoMate tankless water heater. For problems not listed here, or if solutions do not resolve the issue, please contact customer support.

Figure 9: Quick Sizing Guide for temperature rise based on flow rate and inlet water temperature.

Warranty and Support

The ThermoMate 3500W 120V Tankless Electric Water Heater comes with a 2-year warranty from the date of purchase, covering defects in materials and workmanship under normal use and service.

For warranty claims, technical assistance, or any questions regarding your product, please contact ThermoMate customer support. Ensure you have your model number (ET035N) and proof of purchase readily available when contacting support.

Manufacturer: ThermoMate

For the most up-to-date contact information, please refer to the official ThermoMate website or the contact details provided with your product packaging.