Flow
The flow rates for rinnai tankless water heaters are measured in gallons per minute (GPM). MOC varies with the temperature rise required. Raising the temperature refers to the amount of the inlet temperature must be heated to reach the desired temperature. For example, if your incoming temperature is 50 ° F, the increase should be 70 ° F to 120 ° F.
Thus, a tankless heater may have a flow of 7.4 GPM with a temperature rise of 45 ° F or 4.3 GPM with a temperature rise of 77 ° F. To be considered a water heater energy star, the minimum flow with a temperature rise of 77 ° F must be at least 2.4 GPM.
Warranty
Most tankless units offer two separate guarantees, one for the heat exchanger and another for parts. To be considered a water heater energy star, heating has to offer at least a 10 year warranty on the heat exchanger and a 5 year warranty on parts.
Although this is the minimum guarantee required, many models offer a guarantee of 12 or even 15 years on the heat exchanger. Now, the security is independent of the average life expectancy of the model, which is usually 20 years or more.
These are just some of the qualifications for a water heater Energy Star. Several models of tankless water heaters on the market that exceed these requirements. So make sure you take your time looking for one that not only meets your needs but is also Energy Star certified.
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