Tankless water heaters have a well-deserved positive reputation, providing homes with a quick and seemingly inexhaustible supply of hot water on demand. But as great as these systems are, they’re not magic, and knowing how best to install and use these systems can be the difference between a positive experience and a lukewarm one. Sizing a tankless water heater before installation is an important step in getting the most of of these units.
Tankless heaters are sized by considering the temperature rise they can impart into a given per-minute volume of water flow. So, for example, you may want to supply a showerhead with a flow rate of two gallons per minute with a temperature up to 110ºF. Generally, water supply is consider to be 50ºF, which means a temperature rise of 60ºF for those two gallons per minute. A point-of-use water heater supplying only that showerhead would only need to meet those demands.
Central tankless water heaters, as well as tankless heaters supplying appliances or multiple outlets, generally have greater demands placed on them, and need to be sized accordingly. When a water heater is sized too small, it can lead to tepid water temperatures. When sized too large, however, a water heater has a higher energy cost, and may overheat dangerously. Thus, proper sizing has to take typical home water use into account, and it can be beneficial to review your water heater sizing if upgrading to low-flow showerheads or efficient dishwashers and washing machines.
To learn more about sizing a tankless water heater for your Grand Traverse County home, contact us today at Team Bob’s Heating Cooling Plumbing.
Our goal is to help educate our customers in Traverse City, Michigan and surrounding areas about energy and home comfort issues (specific to HVAC systems). For more information about tankless water heaters and other HVAC topics, download our free Home Comfort Resource guide.
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