How do I choose an electric tankless water heater?

There are two things you need to consider before purchasing a tankless water heater: the flow rate, meaning the water measured in gallons per minute (GPM) for a fixture or appliance, and the temperature rise, which is the difference between the groundwater temperature and the desired hot-water output temperature.

How do you know if a tankless water heater is right for me?

If long term savings is your top priority, go with a tankless water heater because the long-term savings can balance out the higher upfront costs. If you’re short on cash right now, go with a traditional tank-type water heater because the up-front installation costs are usually lower.

What size electric tankless water heater do I need for a family of 5?

In short, a family of 5 would need a 10 GPM gas tankless heater or 27 kW electric tankless heater if you live in the northern part of the USA, where the input water has a lower temperature. The tankless heater has to work extra hard to bring the water temperature up to 110˚F or 120˚F.

What is the downside of an electric tankless water heater?

The Cons of Tankless Water heaters:

Con: High Upfront Cost of the Unit and Installation. Con: Take Longer to Deliver Hot Water. Con: Cold Water Sandwich. Con: Inconsistent Water Temperature When Multiple Outlets Are in Use.

How many gpm do I need for my tankless water heater?


What is a flow rate and what should I ask for? Consider how many of these needs you may have simultaneously to determine the maximum flow rate you require. For a home with 1 bathroom, we recommend 6-7 GPM; 2 bathrooms, 8 – 9 GPM; and 3+ bathrooms, 9-11 GPM.

How many gpm do I need for my house?

The average household needs 100 to 120 gallons per person per day, and a flow rate of about 6 to 12 gallons per minute.

How do I know what size tankless water heater I need?

How to Select the Right Size Tankless Water Heater

  1. Determine the maximum number of devices you want to run and their total flow rate. Then, add up their flow rates (gallons per minute). …
  2. Determine required temperature rise. …
  3. Sizing Example: An average shower will be between 104–106° and uses 2.6 gallons of water.

Are electric tankless water heater worth it?

Tankless: Gas and electric tankless water heaters run more efficiently than the conventional water heaters of the same fuel type. We rated the annual energy consumption cost Excellent for a gas model but only Fair for an electric, but both rate Very Good for energy efficiency.

How many BTU do I need for tankless water heater?

If you need to provide a whole house with hot water and your peak water demand is high, then you’ll need up to 200,000 BTU. If you only need a couple of low flow fixtures at once, then you can go with lower BTU since it will consume less.

What maintenance is needed on a tankless water heater?

Tankless Water Heater Maintenance

  • Flushing the System. The hot water heater should be flushed at least once a year. …
  • Cleaning the Air Filter. In your tankless water heater, there is an air filter that will need to be cleaned regularly. …
  • Cleaning the Water Filter. …
  • Cleaning the Tank.

Can a tankless water heater flood a house?

But because tankless water heaters don’t actually store water at all, the risk of flooding is tremendously reduced (although damaged pipes still pose a potential risk).

Do you need a water softener with a tankless water heater?

Tankless Water Heaters

For customers who either already have a tankless water heater or are considering switching to tankless, a water softener is a great idea. Because it helps protect your water heater, we will actually recommend a water softener with all tankless installs we do!

Does hard water affect tankless water heaters?

Many experts believe that hard water is the number one enemy of an on-demand water heating system. Hard water can cause havoc on your home’s appliances, including tankless water heaters.

How long will a tankless water heater last?

Some people hesitate to decide on a tankless water heater because they can be a slightly higher cost; however, you get significantly more life out of one. A standard water heater tank lasts about 8-12 years. A tankless water heater can last as long as 25 years!

How much does it cost to add a tankless water heater?

Tankless water heater installation costs $800 to $3,500 on average. Tankless hot water heater prices are $300 to $2,100 for a gas or electric on-demand system, plus $300 to $2,500 for installation labor. Tankless water heaters save $40 to $200 yearly by reducing energy costs by 8% to 34%.

How much electricity does a tankless water heater use?

Most American families use around 50 gallons of hot water per day. To meet this demand, an electric tankless water heater will use 9–12 kWh of electricity. An electric tankless water heater needs about 3 kWh of electricity to heat a 10-minute shower.

Do tankless water heaters need a vent?

Tankless hot water heaters require special venting to blow hot exhaust gas outside, where it dissipates. Unlike traditional tank-style water heaters, gas tankless hot water heaters offer far more versatile venting options.

How much does it cost to run an electric tankless water heater?

Pros. Cheaper to operate — Using a tankless hot water heater can save you hundreds of dollars per year. A typical 40 gallon electric water heater will cost anywhere from $200 per year for the most efficient models to $800 for the least efficient models, tankless models often cost less than $100 per year to operate.

Is electric tankless water heater better than tank?

According to, “For homes that use 41 gallons or less of hot water daily, demand (or tankless) water heaters can be 24% to 34% more energy efficient than conventional storage tank water heaters.” Tankless water heaters (if gas-fired) will save homeowners over $100 annually the longer they remain in service.