![]() ![]() “Flow rate is the key spec when sizing a tankless water heater,” O’Brian says. Tankless water heaters do not store hot water. Photo: To select the right tankless water heater, estimate the necessary flow rate based on hot water usage and the required change in temperature. Bathing or showering (per person)-20 gallons.Use the numbers below to help you estimate peak hour usage and determine the ideal FHR. You want to look for an FHR that meets or exceed the number of gallons of hot water needed for all the activities that could be performed simultaneously at the busiest point of the day. Smith 50-gallon ProLine Power Vent Water Heater (available from SupplyHouse) has an FHR of 90 gallons, so it will provide up to 90 gallons of hot water in an hour. This figure reflects the appliance’s efficiency (how quickly the water heater can reheat the water) and gives an idea of what it can handle at a peak hour of usage. For example, the A. The first hour rating (FHR) describes how much hot water a given tank can produce in a single hour when it’s fully heated. In addition to tank capacity, consider a water heater’s first hour rating. You can get a more accurate sense of your family’s hot water needs by digging a little deeper. But it shouldn’t be your only consideration. Smith’s ProLine Power Vent Gas Water Heater (available from SupplyHouse) should get the job done. 5 or more people-over 56 gallons (add 10 gallons per additional person)įor the average family of four, a 40-gallon water heater like A.You can estimate the necessary tank capacity (in gallons) based on the number of people in the house: For a tank-style heater, household size is a simple indicator of hot water needs. ![]() Whether you’re interested in replacing your existing unit with a tank or tankless model, O’Brian has suggestions for determining what size water heater will best meet your needs. In fact, “the number of users is key for tank-style water heaters because the output is more or less fixed,” explains Daniel O’Brian, the technical expert for online plumbing retailer. And you’re right: More family members mean more water usage. A: It sounds like you will need a larger water heater this time around.
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