| 摘要 |
<p>A device for minimizing hot water heat loss in a water heater through service fittings during standby periods. The inlet and/or outlet service fittings are provided with an internal sleeve having at least one flap that is integrally hinged to the sleeve. In a no-flow standby condition, the flap extends transversely across the sleeve to close off the fitting and prevent hot water heat loss by convection. During periods of water flow, the flap is pivoted to an open condition to permit water flow through the fitting with minimum restriction.</p> |
