To estimate average daily hot water thermal-energy
consumption, we use the following equation (Lutz, et al., 1996). T
where Q use dens = density of water (8.293752 lb/gal) Cp = specific heat of water (1.000743 Btu/lb-°F) T T RE = recovery efficiency of water heater UA = standby heat
loss coefficient of water heater (Btu/hr-°F) from Eq. 6 T Pon = rated input power of water heater (Btu/hr) |

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