![]() ![]() And when we talk about efficiency, we always consider speed and energy use. We can write the formula as follows.įHR (first-hour rating) ≥ PHWC (peak hot water consumption)Ī heater’s first-hour rating estimates its efficiency in raising the water temperature to your preferred levels. As a rule, the water heater’s first-hour rating (FHR) should be equal to or higher than a household’s peak hot water consumption.
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