ThermoMate Tankless Electric Water Heater User Manual

1. Introduction

This manual provides essential information for the safe and efficient operation, installation, and maintenance of your ThermoMate Tankless Electric Water Heater. Please read this manual thoroughly before installation and use, and retain it for future reference.

The ThermoMate ET270 is a 27kW electric tankless water heater designed to provide instant, endless hot water for residential whole-house applications. It features self-modulating power, stable water temperature control, and a compact, wall-mounted design.

Figure 1: Front view of the ThermoMate ET270 Tankless Water Heater, showing the digital display and control knob.

2. Important Safety Information

WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death. Read the installation, operating, and maintenance instructions 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.

• Do not install this unit where it may be exposed to freezing temperatures.
• Ensure proper grounding to prevent electrical shock.
• Verify that the electrical supply matches the unit's requirements (27kW, 208~240V, 114A max).
• Do not operate the unit if water is leaking from it. Disconnect power immediately.
• Always turn off power to the unit before performing any maintenance or service.

3. Specifications

Figure 2: Key dimensions and features of the ThermoMate ET270, highlighting its compact size and efficiency.

Figure 3: Examples of typical applications for ThermoMate tankless water heaters in a household setting, including kitchen, bathroom, and laundry.

4. Packing List

Verify that all components are present before beginning installation:

• ThermoMate Tankless Electric Water Heater Unit
• Instruction Manual
• Gaskets (2)
• Screws (4)
• Expansion Bolts (4)

Figure 4: Contents of the ThermoMate ET270 packaging, including the unit, manual, gaskets, screws, and expansion bolts.

5. Setup and Installation

5.1 Electrical Requirements

The ThermoMate ET270 requires a dedicated electrical circuit. Consult a qualified electrician to ensure your home's electrical system can support the unit's power demands.

• Voltage: 208~240V AC
• Amperage: Max 114A
• Breakers: 3 x Double-POLE 40AMP breakers
• Wire Gauge: 3 x 8 AWG
• Recommended Household Service: 200 Amp

Figure 5: Electrical wiring diagram for the ThermoMate ET270, showing connections for three double-pole 40A breakers and 8 AWG wire.

5.2 Plumbing Requirements

• Water Connection: 3/4" NPT
• Install shut-off valves on both hot and cold water lines for maintenance.
• Ensure proper water pressure (Max Operating Pressure: 150 PSI).
• Flush the water lines thoroughly before connecting the unit to remove debris.

5.3 Mounting the Unit

1. Choose a suitable indoor location, protected from freezing temperatures and direct sunlight.
2. Ensure adequate clearance around the unit for ventilation and service access.
3. Mark the mounting points on the wall using the unit as a template.
4. Drill holes and insert the provided expansion bolts.
5. Securely mount the unit to the wall using the provided screws.

6. Operating Instructions

6.1 Initial Startup

1. Before turning on power, ensure the unit is completely filled with water by opening a hot water faucet in your home until water flows steadily.
2. Turn on the electrical breakers supplying power to the unit.
3. The digital display will illuminate.

6.2 Temperature Adjustment

• The unit features a digital temperature display and a control knob.
• Rotate the knob to adjust the desired water temperature in 1°F increments, from 80°F to 140°F.
• The unit will automatically modulate power to maintain the set temperature based on incoming water temperature and flow rate.

Figure 6: Close-up of the user-friendly digital temperature display and control knob, allowing precise temperature adjustments.

6.3 Simultaneous Fixture Usage

The ET270 (27kW) model is designed to handle multiple fixtures simultaneously, depending on the incoming water temperature. Refer to the flow rate chart below to estimate capacity.

Figure 7: Flow rate chart for various ThermoMate models, including ET270, showing approximate usage based on inlet water temperature and desired output temperature of 105°F.

7. Maintenance

The ThermoMate tankless water heater is designed for low maintenance due to its heating element being separated from the water tube, which significantly reduces scale, corrosion, and mineral buildup.

Figure 8: Internal view of the ThermoMate ET270, illustrating the separated heating element design that contributes to reduced maintenance.

7.1 Annual Flushing (Recommended)

While designed for low maintenance, annual flushing is recommended, especially in areas with hard water, to prevent any potential mineral buildup and ensure optimal efficiency. This process typically involves:

1. Turning off power and water supply to the unit.
2. Connecting a flushing kit (not included) to the service valves.
3. Circulating a vinegar solution through the unit to dissolve mineral deposits.
4. Flushing with clear water and restoring the unit to operation.

Refer to the full instruction manual for detailed flushing procedures or consult a qualified professional.

8. Troubleshooting

This section provides solutions to common issues. For more complex problems, contact customer support.

9. Warranty and Support

For warranty information and technical support, please visit the official ThermoMate website or contact their customer service directly. Keep your purchase receipt as proof of purchase.

Visit the ThermoMate Store on Amazon for more products and information.