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Sizing Tankless or Demand-Type Water Heaters. Unless you know otherwise, assume that the incoming water temperature is 50ºF (10ºC). For most uses, you'll want your water heated to 120ºF (49ºC). In this example, you'd need a demand water heater that produces a temperature rise of 70ºF (39ºC) for most uses.
Water Heater Sizes: A Guide If your room is on the top floor, use the higher BTU response. In high humidity areas, lower BTUs will take longer to cool but will do a better job... The low side of the response is estimated to give a room temperature of 78° F. High temperature area such as Southern ...
For tankless water heaters, the key criterion is hot water flow rate; Incoming water temperature is a critical consideration, which varies by region and season. That is, a water heater in the North – either tank or tankless – will need a higher BTU input in the winter than the summer to heat and deliver water to a given temperature.
What size tankless water heater depends on your GPM at peak hot water demand. And your temperature rise which is determined by your incoming water temperature subtracted from your hot water setting. As an example, I will show you what came out for me. I live in Boston so my groundwater temperature is around 47°F.
How to Size Water Heaters The average household member uses around 12 gallons of hot water when taking a shower. Multiply 12 times the number of people who take a shower in an hour’s timespan. For many households, this is around 3 people.
Below, we've highlighted what size water heater you would need in our example of 6.5 GPM at a 63° F temperature rise. (Technically speaking, you could round up to the 70° F temperature rise option, but rounding down to 60° F is the more realistic and acceptable option in this scenario since we're only 3° F under the actual rise).