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What Size Tankless Water Heater Do I Need

September 9, 2020 | Blog

There are many benefits that come along with a tankless water heater installation. These heaters provide a constant flow of hot water, use less electricity, last longer, provide tax breaks and take up less space in your home. But how do you know what size heater is right for you? To help you make this decision, here are some important factors to consider:

  • The size of your home
  • Your home’s rate of water flow
  • The size of your household

The Size of Your Home

Larger homes with several bathrooms typically use more hot water. If you have a home with more than one bathroom, you want to make sure that the tank you choose has a power range large enough to supply plenty of hot water to multiple bathrooms.

To guarantee complete efficiency and consistent hot water for every room in your house, the size of the heater should always relate to the size of your home. The bigger the house, the bigger the tankless heater required.

Your Home’s Rate of Water Flow

Because tankless water heaters work by steaming water as it runs into your house, your home’s water flow rate is directly related to the flow rate of your water heater. If you want to be able to run multiple showers or faucets at once, without sacrificing water flow speeds, your tankless heater will need to be large enough to have a higher flow rate that can handle several running appliances.

You can calculate the required water flow rate of your tank by adding the flow rate of your home’s appliances together. For example, if you want to run a shower with a flow rate of 1.8 GPM (gallons per minute) at the same time as a faucet with 1.0 GPM, you will need a tankless heater that can provide at least 2.8 GPM.

The Size of Your Household

If you have several people living in your home or if you regularly have guests over, you need a tankless water heater that can accommodate everyone. Even if you don’t personally need hot water constantly, in times of high water usage, you’ll want to know that your tankless water heater is big enough to handle the task.

If you’re interested in tankless water heater installation in San Antonio or if you have any questions about tankless water heater sizes, contact Parker & Sons today to speak with one of our technicians about our wide variety of water heaters.

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Very fast response. Reliable and even let us do some of the work to keep costs down. Really worked with us to sort through alternatives to find the best solution. I have used them about 5 years ago and will certainlycall them again if I ever need anything.

Roberta C.

Very Knowledgeable

I recently had several plumbing leaks repaired and couldn’t be happier with the prompt service I received from Parker and Sons. They are very knowledgeable, friendly, reasonably priced, and do quality work. I would definitely recommend them to my family and everyone. I would trust them to repair any leak in the house.

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Amazing service!!! Called and came the same day within 2 hrs. Our toilet had to be re-fitted and snaked. They did a beautiful job on the re-fitting and got the large piece of plastic out of the toilet. Will definitely be recommending them to friends and family. Great service, great people, hard to find these days!!!

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Excellent Service! We had some work done on our kitchen and Parker and Sons were able to come out to our house and help us with our remodel. Great guys and great service. I would recommend them to anyone needing a plumber service.

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Jim and his guys are great to work with. Had Parker & Sons come out to take a look at an AC unit at one of my rental properties. Unit is in the attic. Had to replace a coil on it and did a great job. Will definitely use again.

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I have referred Parker and Sons to all of my customers and I would not think of referring anybody else. They have been great and very punctual. All of the plumbers and office staff have been amazing!

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I was in good hands today with journeyman plumber Mark Rizley. He remained until all was better than before. He replaced a PRV and improved a mediocre repair recently done by another well known local company. The price remained reasonable despite the extra effort needed for the job. Well done Mark! Parker and Sons will be my first call in the future.

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Ben A.

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Have used Parker & Sons 3 different times, once for a huge complex plumbing repair and twice for smaller jobs. Fair prices and excellent work/fast response time every time.

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