Tankless Water Heaters

Are you tired of running out of hot water in the middle of a shower or bath? Are you looking for a more energy-efficient way to heat your water? Look no further than tankless water heaters from Aqua Science.

What is a tankless water heater?

A tankless water heater is a device that heats water as it flows through the unit, rather than storing hot water in a tank like traditional water heaters. This means you’ll never run out of hot water, and you’ll save energy and money by only heating the water you need.

How do tankless water heaters work?

Tankless water heaters use a heat exchanger to heat water as it flows through the unit. When you turn on a hot water tap, cold water enters the unit and is heated by a gas burner or electric element. The heated water then flows out of the unit and to your faucet or shower head.

Benefits of tankless water heaters

Tankless water heaters offer a number of benefits over traditional water heaters:

  • Endless hot water supply: You’ll never run out of hot water, even with multiple appliances running at once.
  • Energy efficiency: Tankless water heaters use less energy than traditional water heaters, which can save you money on your utility bills.
  • Longer lifespan: In Arizona, a tankless water heater can last up to 20 years, compared to 5-8 years for traditional water heaters.
  • Space-saving design: Tankless water heaters are compact and can be mounted on a wall, freeing up floor space in your home.
Tankless water heater NPE A2 image

Types of tankless water heaters

There are different types of tankless water heaters: electric and gas and condensing vs non-condensing.

Electric tankless water heaters

These water heaters use electricity to heat the water as it flows through the unit. They are typically smaller and less expensive to purchase and install than gas-fired tankless water heaters, but they may not be as powerful and may take longer to heat the water. They also require a dedicated electrical circuit with sufficient amperage to power the unit.

Gas-fired tankless water heaters

These water heaters use natural gas or propane to heat the water as it flows through the unit. They are generally more powerful than electric tankless water heaters and can supply hot water to multiple fixtures at once. Gas-fired tankless water heaters require proper venting and a gas line to the unit, which can increase installation costs. They also require periodic maintenance to ensure efficient operation.

Condensing vs non-condensing tankless water heaters

A condensing tankless water heater is a more advanced type of tankless water heater that captures the heat from the exhaust gases and uses it to preheat the incoming cold water, making the unit more efficient.

A non-condensing tankless water heater, on the other hand, simply exhausts the hot combustion gases outside and does not recover any of the heat that is lost in the exhaust.

It’s important to choose the right size tankless water heater for your needs based on the number of people in your household, your hot water usage patterns, and the climate in your area. A professional installer can help you determine the appropriate size and type of tankless water heater for your home.

Tankless Water Heaters from Aqua Science

At Aqua Science, we pride ourselves on offering Navien tankless condensing gas water heaters. Our experts can help you choose the right size and model for your home, and our professional installation team will ensure your new water heater is installed correctly.

NPE-A2 Series from Navien Features

tankless water heater benefits

Heating capacity

The NPE-180A2 has a maximum heating capacity of 150,000 BTUs per hour, while the NPE-210A2 has a maximum heating capacity of 180,000 BTUs per hour, and the NPE-240A2 has a maximum heating capacity of 199,900 BTUs per hour. This means that all three models are capable of providing hot water quickly and efficiently.

Flow rate

The NPE-180A2 has a maximum flow rate of 8.4 gallons per minute (GPM), while the NPE-210A2 has a maximum flow rate of 10 GPM, and the NPE-240A2 has a maximum flow rate of 11.2 GPM. This means that all three models can supply a continuous flow of hot water to multiple outlets at once.

Energy efficiency

All three models have an Energy Factor (EF) rating of 0.97, which means they are highly efficient and can help you save on energy costs.

Water savings

All Navien NPE-A2 models save tens of thousands of gallons in water with a built-in recirculation pump.

Features NPE-180A2 NPE-210A2 NPE-240A2
Heating Capacity 150,000 BTUs per hour 180,000 BTUs per hour 199,900 BTUs per hour
Flow Rate (Gallons Per Minute) 8.4 GPM 10 GPM 11.2 GPM
Energy Efficiency
Wi-Fi connectivity

Dual stainless steel heat exchangers

All three models feature dual stainless steel heat exchangers, which help to reduce the risk of corrosion and increase the lifespan of the unit.

Wi-Fi connectivity

All three models can be controlled remotely through a Wi-Fi connection, allowing you to adjust temperature settings and monitor usage from your smartphone or tablet.

Easy installation

The NPE-A2 series is designed for easy installation, with a compact and lightweight design that can be mounted on a wall or installed in a closet.

User-friendly interface

The user-friendly interface on the front of the unit allows you to easily adjust temperature settings, switch between modes, and view error codes.


The NPE-A2 series is designed with eco-friendly materials and features, including a PVC venting system that reduces greenhouse gas emissions.

Safety features

All three models come with a range of safety features, including a flame rod, overheat protection, and freeze protection.

Overall, the Navien NPE-180A2, NPE-210A2, and NPE-240A2 tankless water heaters are high-performance units that offer a range of advanced features and benefits. With their high heating capacity, energy efficiency, and user-friendly interface, these models are a great choice for homeowners looking to upgrade their hot water system.

Tankless water heater installation by Aqua Science

Our team of licensed professionals can install your new tankless water heater quickly and efficiently. We’ll make sure everything is up to code and working properly before we leave, so you can enjoy endless hot water for years to come.

Tankless water heaters FAQs

How much do tankless water heaters cost?

The cost of a tankless water heater varies depending on the size and type of unit you choose.
Generally, gas models cost more than electric models.

How efficient are they?

Tankless water heaters are highly efficient, with an energy efficiency rating (EF) between 0.82 and 0.96.
This means they use 10-50% less energy than traditional water heaters.

How much maintenance is needed?

Tankless water heaters require minimal maintenance.
You should flush the unit once a year to remove mineral buildup, and have a professional inspect the unit every few years to ensure it’s running properly.

As always, our water treatment experts are available to answer any questions you may have. Call us at 480-454-3700 to schedule a free consultation, or use our contact forms to send an inquiry!


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