Takagi T-H3-DV-N Tankless Water Heater

Highest Output Tankless Water Heater

Why people love it
  • Enough hot water to supply a large-family home
  • Self-installation surprisingly simple; get it up and running in no time
  • Steady hot water output while still offering energy-efficiency

Pricier than most and inconsistent heating.


Hot Water Output: While most reviewers agree that the water heater can produce anywhere between 6 and 8 gallons of hot water per minute, some have insisted that it gets up to 10 GPM. Compared to the 2-5 GPM common with most hot water heaters, this one performs far better than the rest!

Though it's a gas heater (and thus costlier to run than an electric heater), it's still very energy-efficient and delivers hot water with minimal heat loss.

Reliability: The hot water heater is highly reliable, with a user-friendly installation and operation that will make it a dream to run in your home. It's bigger and heavier than some of the other tankless water heaters on our list, but that actually helps to facilitate the higher water output.

The water connections to and from the heater are larger than average, allowing for a higher flow of water into and out of the heater. The heating can be inconsistent, especially in cold climates, but you'll find it's more than enough for any 5+ family home.

Features: The digital controls make it easy for you to adjust your heat settings as desired, and there's even a remote control for maximum convenience. The heater comes with a built-in lighting mechanism, so no need to futz with a pilot light.

The auto shut-off feature will prevent the heater from overheating, and the safety features are all computerized. There are even altitude settings to adjust your heater to higher altitudes and colder climates.

Price: At $1,225, this is the priciest tankless water heater on our list. It delivers reliability and excellent performance, but it's close to three times as expensive as our top-rated model.

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