How to Determine the Right Size for Your Tankless Electric Hot Water Heater
Learn how to choose the right size tankless electric hot water heater based on your household needs.
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Determining the size of a tankless electric hot water heater depends on your household's peak hot water demand and incoming water temperature. Generally, calculate the total flow rate (in gallons per minute) of all fixtures you expect to use simultaneously, and ensure the heater can raise that amount of water to your desired temperature. For most homes, a unit that provides 8-10 GPM should be sufficient. Consult with a professional to choose the best model for your needs.
FAQs & Answers
- What is the average flow rate for a tankless electric hot water heater? Most homes require a tankless electric hot water heater that provides 8-10 gallons per minute (GPM) for sufficient supply.
- How can I calculate my household's peak hot water demand? Add up the flow rates of all fixtures you plan to use simultaneously—this will give you your peak hot water demand in GPM.
- Do I need to consult a professional for sizing my water heater? Yes, it's recommended to consult with a professional to ensure you select the best model for your specific needs.
- What factors affect the temperature rise of hot water? Incoming water temperature and desired output temperature are key factors that affect the required temperature rise for your tankless heater.