WATER HEATER

摘要

A water heater has a primary heat exchanger having a first heat transfer tube, a secondary heat exchanger having a second heat transfer tube connected with the first heat transfer tube and being located higher than the first heat transfer tube, and an outflow path connected to an outflow-side end portion of the first heat transfer tube.;The outflow path has an offset flow path portion including a rising portion which rises upward or obliquely upward from a connecting portion of the outflow path and the outflow-side end portion of the first heat transfer tube or from the vicinity of the connecting portion, the offset flow path portion being offset at a position higher than the outflow-side end portion. When hot water supply is temporally stopped, the water at high temperature in the first heat transfer tube flows into the offset flow path portion, thereby inhibiting such a disadvantage that water having a lower temperature than a target temperature is supplied because of a natural convection at the time of restarting hot water supply.

主权项

1. A water heater comprising:
a primary heat exchanger having a first heat transfer tube configured to recover heat from heating gas; a secondary heat exchanger having a second heat transfer tube configured to further recover heat from heating gas of which heat has been recovered in the primary heat exchanger, the secondary heat transfer tube being connected with the first heat transfer tube and being located higher than the first heat transfer tube; a bypass flow path connecting an inflow path connected with an inflow-side end portion of the second heat transfer tube and an outflow path connected with an outflow-side end portion of the first heat transfer tube; and the outflow path having an offset flow path portion including a rising portion which rises upward or obliquely upward from a connecting portion of the outflow path with the outflow-side end portion of the first heat transfer tube or from the vicinity of the connecting portion, the offset flow path portion being offset at a position higher than the outflow-side end portion.