Heya! if you’re thinking about switching to an electric tankless water heater, you’re likely in one of two camps: either your old system is on its last legs, or you’re eyeing a more efficient, space-saving solution—maybe even planning an off-grid setup.
Off-grid cabin powered by solar panels
I’m Adam Miller, and after years of installing everything from bulky gas heaters to compact electric models, I’ve seen why the niche of choosing electric tankless water heaters is gaining ground. For folks wanting a reliable, eco-friendly option that pairs well with solar power, electric tankless heaters are worth a serious look.
Here are my top picks in no particular order:
The Premium Pick Stiebel Eltron Tempra Plus electric tankless water heater – solid efficiency, quietness and reliability
Switching to an electric tankless water heater can be a game-changer, but it’s not the right choice for everyone. Here are a few key things to keep in mind before making the switch:
Electrical Requirements
Most electric tankless water heaters require a significant amount of power. Ensure your home’s electrical panel can handle the load—many units need a 200-amp service. If your panel isn’t up to par, you might need an upgrade, which could add to your installation costs.
Water Flow and Temperature Rise
Electric units work best in areas with mild climates or where the incoming water isn’t too cold. If you live somewhere with icy winters, you might need a unit with a higher GPM (gallons per minute) or consider a hybrid solution.
Solar Compatibility
While electric tankless systems can pair with solar setups, keep in mind that powering one reliably requires a robust solar array and battery system. This can be costly, so weigh the upfront investment against long-term savings carefully.
How to Determine If an Electric Tankless Water Heater Is Right for You
Not sure? Drop me a comment below!
Electric tankless water heaters are ideal for specific scenarios. Here’s how to decide if one fits your lifestyle:
You Have Limited Space
These units are compact and can be wall-mounted, making them perfect for small homes, apartments, or even RVs.
You Want Lower Maintenance Costs
Compared to gas models, electric heaters often have fewer moving parts, leading to lower upkeep costs.
You Live in a Warm Climate
They’re most efficient in regions where incoming water temperatures don’t require a massive boost to get hot. I know folks in North Florida, near Jacksonville, who use a 40-amp electric tankless heater in a three-bed, two-bath home. They can run two showers year-round without issues, even on a 150-amp service.
You’re Looking to Lower Carbon Emissions
If your home is already running on clean electricity or you’re considering a solar setup, an electric unit can reduce your environmental footprint.
If these factors match your situation, an electric tankless water heater could be the perfect fit. Otherwise, explore other solutions like gas tankless heaters or hybrids.
Frequently Asked Questions (FAQs)
Do electric tankless water heaters require a pressure relief valve?
Unlike traditional tank systems, most electric tankless models don’t need a pressure relief valve because they don’t store hot water. However, local plumbing codes may still require one, so always double-check with a licensed plumber or your local regulations.
How do I prevent scale buildup in an electric tankless water heater?
If you live in an area with hard water, installing a water softener or a descaler system is essential. Without it, mineral deposits can clog the heating elements, reducing efficiency and lifespan. Regular flushing (every 6–12 months) with a descaling solution is also a must.
What’s the minimum flow rate needed to activate an electric tankless water heater?
Most models require a minimum flow rate of 0.3 to 0.5 gallons per minute (GPM) to activate the heating elements. If your faucets or showerheads are too low-flow, you might experience delays or inconsistent heating.
Can I install an electric tankless water heater outdoors?
It depends on the model. Some electric tankless units are rated for outdoor installation but may require weatherproof housing. If you’re considering this, make sure the unit is designed to handle freezing temperatures in your area.
How do I size an electric tankless water heater for a multi-bathroom home?
You’ll need to calculate the total GPM demand during peak usage and compare it to the unit’s output at your local groundwater temperature. In most cases, larger homes will require multiple units or a hybrid setup for sufficient hot water supply. Check out my sizing guide here.
Why is my electric tankless water heater tripping the circuit breaker?
This could indicate an undersized breaker or wiring issue. Most electric tankless heaters require dedicated circuits with the correct amperage. Consult an electrician to ensure your system is properly wired and safe.
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