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Be cautious of a water temperature of 140✯ because it increases the possibility of scalding. In that case, you'll need a temperature rise of 90✯ (50✬). For dishwashers without internal heaters and other such applications, you might want your water heated at 140✯ (60✬). In this example, you'd need a demand water heater that produces a temperature rise of 70✯ (39✬) for most uses. You can also estimate the temperature by holding a thermometer under a cold-water faucet. For most uses, you'll want your water heated to 120✯ (49✬). Unless you know otherwise, assume that the incoming water temperature is 50✯ (10✬). To determine temperature rise, subtract the incoming water temperature from the desired output temperature. #Does peakhour monitor usage of individual devices installTo reduce flow rates, install low-flow water fixtures. The flow rate through the demand water heater should be at least 3.25 gallons (12.3 liters) per minute. If you don’t know the flow rate, estimate it by holding a pan or bucket under the faucet or shower head and measure the flow for a minute. For example, let's say you expect to simultaneously run a hot water faucet with a flow rate of 0.75 gallons (2.84 liters) per minute and a shower head with a flow rate of 2.5 gallons (9.46 liters) per minute. This is the desired flow rate you'll want for the demand water heater. Then, add up their flow rates (gallons per minute). Therefore, to size a demand water heater, you need to determine the flow rate and the temperature rise you'll need for its application (whole house or a remote application, such as just a bathroom) in your home.įirst, list the number of hot water devices you expect to use at any one time. Tankless or demand-type water heaters are rated by the maximum temperature rise possible at a given flow rate. Sizing Tankless or Demand-Type Water Heaters If you haven't yet considered what type of water heater might be best for your home, learn more about selecting a new water heater.
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