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  • opti15 | 15kW 240V 3.0GPM 25-Year Warranty Electric Tankless Water Heater

opti15 | 15kW 240V 3.0GPM 25-Year Warranty Electric Tankless Water Heater


25-Year Warranty
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25-Year Warranty

Covers manufacture defects

COVERAGE HIGHLIGHTS

PARTS

Sensors: thermistors + transducers. Electrical: thermostats and triacs. Brains: control and power boards.

HEAT EXCHANGER

All exchangers are pressure tested to ensure NO LEAKS. Leaks at welded joints due to manufacture defect are covered.

RESOLUTIONS

Our goal is to minimize your hot water downtime. We'll ship a part, or a replacement unit depending on the issue.

Shipping

Ground shipping within the continental US is covered.

$519.00

Replace your whole-home tank heater, install at point of use, or boost a hybrid.

what’s the right heater for me?

Overview

The opti15 electric tankless water heater can replace a tank heater for the whole home, act as a point of use, or supplement a hybrid as a booster to extend hot water availability. Refer to the sizing map in the images to learn more about the model that is best for you.

With its powerful 14.5kW heating system and one-of-a-kind ultrasonic design, this water heater is engineered for energy efficiency and space savings.

Expert, in-house, customer support stands behind the industry leading 25-year warranty for reliability you deserve in a product meant to last.

Set it and forget it to the exact temperature you desire for endless hot water with an accuracy of 1°.

Product Details

technical specs:

electrical

  • 14.5 kW (15 kW rated)
  • 240V rated voltage
  • 60A max amp draw
  • 1 x 60 AMP DP breaker required
  • 2 x 6 AWG wire
  • 50/60 Hertz
  • 99% energy efficiency
  • 2 copper-sheathed heating elements

plumbing

  • 3/4" NPT inlet/outlet connections
  • 0.25 GPM activation flow rate
  • 25-150 PSI dynamic operating pressure
  • 5 GPM max allowable flow
  • Welded copper heat exchanger

technical

  • Digital temperature control
  • Temperature range: 80°F - 140°F
  • ±1°F temperature accuracy
  • LED display
  • Patented ultrasonic flow sensor

physical

  • Dimensions: 12.5"H x 11.5"W x 3.5"D
  • Weight: 7.5 lbs
  • Indoor use / Wall mounted
  • 3/4" punchout diameter

certifications + warranty

  • ETL Listed / Intertek certified
  • Conforms to UL 499 / CSA C22.2#64
  • ANSI/CAN 372:2022 compliant (lead-free)
  • 25-year residential warranty (see warranty page for details)
  • 5-year commercial warranty

Install + Care + Warranty

The opti15 includes a 25-year residential warranty and 5-year commercial warranty covering all components - heating elements, sensors, heat exchanger, and electronics.

Installation Resources:

Professional installation recommended. Requires 240V electrical service, 60A breaker, and basic plumbing connections. All electrical work must comply with local codes.

Need help? Contact our U.S.-based technical support team for installation guidance and troubleshooting.

Delivery Info

Orders are typically processed within 1-5 business days of receipt. Please note that this timeframe may vary depending on the specific model and availability of your chosen tankless water heater.

Shipping Methods: We offer various shipping methods through reputable carriers like USPS, DHL, UPS and FEDEX. Shipping costs are calculated based on your order weight, destination, and chosen shipping method. You will see these costs reflected during checkout before finalizing your purchase.

Its Optimal

What else should I consider?

Smart Technology

Our heaters are not just smart; they're geniuses in the world of water heating.

Ultrasonic Innovation

Experience the future with our ultrasonic flow sensing technology.

Unmatched Reliability

Feel secure with the last water heater you'll ever need.

Space Saver

Don't let a bulky tank take over your space.

Cost Efficiency

Keep your money in your pocket where it belongs.

Energy Conscious

Join the green revolution with a staggering 99.9% energy efficiency rate.

Top 5 FAQs

All what you need to know

HOW CAN I FIND THE RIGHT TANKLESS WATER HEATER FOR MY NEEDS?

Finding the perfect tankless water heater is easy with our sizing calculator. By inputting a few details about your water usage and preferences, you'll receive a recommendation tailored just for you.

Simplify your decision and ensure you choose the best model for your home.

Try our Sizing Calculator now.

WHAT IS THE LIMITED LIFETIME WARRANTY COVERAGE?

Included in your out-of-the-box limited lifetime warranty are:

  • All electrical sensors, thermistors, transducers, control boards, thermostats, etc.
  • Soldered heat exchangers.
  • Ground shipping within the continental US.
  • RA (Return Authorization) - A new unit if necessary (approval required by a supervisor).

For more information, please visit our warranty page.

HOW EFFICIENT ARE ELECTRIC TANKLESS WATER HEATERS?

Optimal heaters are highly efficient, by 99.9%. This means almost all the unit's electricity translates into water heating, minimizing energy waste. Here's a breakdown of the efficiency:

Advantages:

  • No standby losses: Unlike tank heaters that constantly heat and reheat water even when unused, tankless heaters only activate when you open a hot water tap. This eliminates standby losses, significantly reducing energy consumption.
  • Demand-based heating: They only heat water when needed, matching your hot water usage patterns and minimizing energy waste.
  • Reduced carbon footprint: Their lower energy consumption contributes to a smaller carbon footprint than traditional tank heaters.
ARE TANKLESS WATER HEATERS “INSTANTANEOUS”?

When it comes to Unique SMART tech, Optimal’s patent-pending ultrasonic sensor technology is the most accurate and fastest flow sensor tech in the water heating market today, and it is more functional and more reliable than traditional flow sensors. 

How it works: Ultrasonic water flow sensors harness sound waves! They ping high-frequency sound pulses through the pipe, measuring the time it takes for echoes to bounce back from particles or bubbles in the flowing water. By comparing travel times between upstream and downstream signals, they calculate the water's speed, and with the pipe's known diameter, they instantly reveal the flow rate!

HOW MUCH CAN I SAVE WITH AN ELECTRIC TANKLESS WATER HEATER?

We estimated 30% to 60% energy savings compared to tank heaters. You can expect to save 30%–60% on your water heating costs, especially if your hot water usage is moderate, with an estimated  12 to 24-month payback period of any incremental cost going from tank to tankless, depending on the model perched.

For more details, visit our product faqs

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