Water heater dip tube

A water heater dip tube comprising:

• an elongated body having an inlet end and an outlet end;
• an inner volume arranged within the elongated body and providing a fluid flow path extending through the inner volume between the inlet end and the outlet end;
• an anti-siphon orifice arranged along the elongated body proximate the inlet end and extending through a wall of the elongated body;
• and
• a flow channel forming part of the inner volume and connecting the anti-siphon orifice to a remainder of the inner volume, wherein the flow channel is not along the fluid flow path and is configured to prevent flow through the anti-siphon orifice when fluid is flowing along the fluid flow path from the inlet end to the outlet end and to allow flow through the anti-siphon orifice in the absence of fluid flow along the fluid flow path from the inlet end to the outlet end,
• wherein the elongated body includes a first body portion and second body portion, the second body portion being joined to the first body portion to form the flow channel, and
• wherein the elongated body further includes a third body portion joined to one of the first body portion and the second body portion, and wherein the inlet end is provided by the third body portion.

A water heater dip tube comprising:

• a first body portion providing an inlet end of the dip tube;
• a second body portion providing an outlet end of the dip tube;
• a third body portion joined to the first body portion and the second body portion, a first end of the third body portion being received within the first body portion and a second end of the third body portion being received within the second body portion;
• an anti-siphon orifice extending through a wall of the second body portion, wherein the anti-siphon orifice is located at a first distance from the inlet end and wherein the second end of the third body portion extends to a second distance from the inlet end, the second distance being greater than the first distance, wherein the anti-siphon orifice extends through a wall of the third body portion;
• and
• an elastomeric membrane at least partially arranged within the third body portion and operable to block fluid flow through the anti-siphon orifice when a pressure at the inlet end is greater than a pressure at the exterior of the dip tube adjacent to the anti-siphon orifice, and to allow fluid flow through the anti-siphon orifice when a pressure at the inlet end is less than a pressure at the exterior of the dip tube adjacent to the anti-siphon orifice.

A water heater dip tube comprising:

• a first body portion providing an inlet end of the dip tube;
• a second body portion providing an outlet end of the dip tube;
• a third body portion joined to the first body portion and the second body portion, a first end of the third body portion being received within the first body portion and a second end of the third body portion being received within the second body portion;
• an anti-siphon orifice extending through a wall of the second body portion, wherein the anti-siphon orifice is located at a first distance from the inlet end and wherein the second end of the third body portion extends to a second distance from the inlet end, the second distance being greater than the first distance;
• and
• an annular flow channel arranged between the second body portion and the third body portion, wherein the anti-siphon orifice is in fluid communication with the annular flow channel.