Tankless Water Heater Installation & Use: What Homeowners Should Know
If you're considering switching to a tankless water heater, you're not alone. More homeowners across the U.S. are choosing tankless electric models like those from ThermoMate for their energy efficiency, space-saving design, and endless hot water supply.
But before you install one, it’s important to understand the basics. In this guide, we’ll walk you through everything you need to know — from installation requirements to day-to-day usage — so you can make the most of your investment.
Why Choose a Tankless Water Heater?
Unlike traditional tank water heaters that store hot water, tankless systems heat water on demand. This means:
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Lower energy bills – no standby heat loss
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Unlimited hot water – ideal for families or long showers
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Compact design – mounts easily on walls
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Longer lifespan – often 10–15 years or more with proper maintenance
A ThermoMate tankless electric water heater brings modern efficiency to your home’s plumbing system.
Installation Requirements
Before installation, there are several key factors to consider to ensure your system operates safely and efficiently.
1. Choosing the Right Location
Thanks to their compact design, ThermoMate tankless heaters can be installed in a variety of places, including:
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Bathrooms – for faster hot showers
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Kitchens – near sinks and dishwashers
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Basements or utility rooms – to keep equipment out of sight
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Exterior walls – when indoor space is limited (with proper weather protection)
Pro tip: The closer the unit is to the point of use, the less time it takes for hot water to arrive.
2. Electrical Requirements
ThermoMate electric tankless water heaters operate on 220V or 240V circuits and require specific amperage depending on the model:
| Model | Voltage | Required Amperage |
|---|---|---|
| ET110 | 240V | 50A |
| ET140 | 240V | 60A |
| ET180 | 240V | 75A |
| ET240 | 240V | 100A |
Make sure your home's electrical panel can support the chosen model. A dedicated circuit breaker is strongly recommended.
3. Water Pressure Compatibility
ThermoMate heaters are compatible with most U.S. residential plumbing systems. They typically require:
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Minimum pressure: 20 psi
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Maximum pressure: 150 psi
If your home’s water pressure falls outside this range, you may need to install a pressure regulator to ensure stable performance.
4. DIY or Professional Installation?
While installation may be possible for skilled DIYers, most homeowners should hire a licensed electrician or plumber, especially if:
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Electrical upgrades are needed
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Plumbing lines must be modified
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Local codes require a professional install for compliance
Bonus: Professional installation helps preserve your product warranty and ensures everything is set up safely.
What to Expect During Daily Use
Once your ThermoMate tankless water heater is installed, here’s what you can expect in terms of performance and experience:
1. How Quickly Does It Heat Water?
Hot water starts flowing within a few seconds of turning on the tap. There's no waiting for a storage tank to heat up — perfect for busy mornings or back-to-back showers.
2. Can It Run Continuously?
Yes! Because it heats water on demand, a tankless unit never "runs out" of hot water. You can enjoy long showers, back-to-back laundry cycles, and dishwashing without interruptions.
3. Will It Work During a Power Outage?
Since ThermoMate heaters are electric, they do require power to operate. If your area is prone to outages, consider pairing with a home generator or backup battery system.
Frequently Asked Questions
Can It Work with Solar Water Heating Systems?
Yes. ThermoMate units can be integrated with solar water heating systems as a backup — ensuring reliable hot water even when solar input is low.
Is It Suitable for Cold Weather?
Absolutely. ThermoMate heaters are designed to handle lower inlet water temperatures during winter. Just be sure to choose a model that matches your climate:
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Warmer climates: 11kW–14kW
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Moderate climates: 18kW–24kW
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Colder climates: 27kW for optimal performance
Final Thoughts
A ThermoMate tankless water heater is a smart upgrade that improves your home's comfort and energy efficiency. With proper installation and maintenance, you’ll enjoy years of reliable hot water — with no bulky tank taking up space.
Whether you're renovating, building new, or simply replacing an outdated unit, ThermoMate has a model to fit your needs.