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Sizing a Tankless Water Heater for Your Addison Home

Posted on: May 30, 2012

Tankless water heaters are gaining popularity among Addison homeowners because of their on demand hot water supply and space-saving design. Although they are more expensive than traditional tank water heaters, on demand water heaters are more efficient, reliable, and easier to install and maintain. Before choosing to install a tankless water heater, however, you will have to decide which size will meet your hot water needs.

Rather than storing hot water in a tank, the tankless models heat the water with individual units located near the application where hot water is needed, such as a shower or washing machine. For larger homes, some of these smaller units cannot heat enough water for several applications running at the same time. You can also install a single tankless water heater for the entire house, or separate ones for appliances that use more hot water.

Finding the proper size and type will depend on the flow rate—measured  by a GPM (gallons per minute) number—that each fixture needs. Every application has a standard flow rate that must be added up in order to calculate the hot water demands for your entire home. For instance, if someone is using a sink with a 1.5 GPM at the same time another person is running a shower with a 2.0 GPM, the flow rate for the tankless unit would need to be at least 3.5 gallons per minute. You will have to add up the flow rate for all the applications in the house to get the minimum GPM figure for your tankless water heater.

In addition to flow rates, tankless hot water heaters are also measured by how much the water temperature needs to rise as it moves through the heating unit. You can determine the temperature rise for each application by subtracting the temperature of water coming in from the desired temperature going out. Once you add those together with the overall flow rates, you will know which tankless water heater can handle your overall hot water needs.

Before you buy an on demand hot water heater, it is best to talk to a professional plumber. While the flow rates and temperature rise for most household appliances are fairly standard, these numbers can vary because of several factors that plumbers are trained to calculate. Size is not the only factor to consider when shopping for a tankless water heater. Fuel type and efficiency should also be factored in to your purchase, which is another reason to talk to a licensed plumber.

If you aren’t sure what type or size of tankless water heater is right for your Addison home, call Dial 1 Plumbing to speak with one of our professional plumbers. We are always glad to offer our expert advice so that you can meet all of your hot water needs in the most efficient way possible.

 

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James demonstrated both a professional and personable demeanor. He was competent and efficient. I was very pleased with his workmanship. Job, well done!


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James did a great job with finding the solution to my leak. He did a great job installing our new toilet.


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Jonathan was friendly and professional and he put on booties to not track in mud from outside and i thought that was so sweet of him. He took his time and he was training another nice young man. Thank you again!! That’s why I’m a customer. 😘


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Called for a weekend AC repair knowing it would be slightly more expensive. The tech came within the hour and got the repair done. Repair cost was very reasonable and repair was done within an hour if him arriving. I generally get concerned with unnecessary repairs, especially with weekend jobs, but not the case with Dial One. Will always use them.


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James was very knowledgeable and friendly. He replaced my water heater within a short period of time and came back to follow-up on the installation. Also Deborah, in the office, did a great job keeping in contact with me to let me know when James was on his way and following up with me to make sure I was satisfied. Definitely recommended!


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On time professional service


Response from Dial One Johnson Plumbing:

Thank you Ross for your kind words! You know who to call anytime you have any plumbing, cooling or heating issues arise! Thank you so much, Debra Clark, Dial One