Vent Attachment for Tankless Water Heater

A vent attachment for a tankless water heater, the vent attachment comprising:

• a first conduit having a first end configured to couple with the tankless water heater, the first conduit comprising:
• a first exhaust pathway having a first diameter configured to expel exhaust gas from the tankless water heater;
• and
• a first air intake pathway having a second diameter greater than the first diameter of the first exhaust pathway, wherein the first air intake pathway is coaxially disposed around the first exhaust pathway and configured to allow flow of combustion air into the tankless water heater, the first air intake pathway comprising:
• an adjustable portion having a first adjustable length defined from an edge of a second end of the first conduit along a longitudinal axis thereof;
• and
• a first adjustment mechanism defined on the adjustable portion;
• and
• a second conduit having a first end configured to couple with the first conduit, the second conduit comprising:
• a second exhaust pathway having a third diameter smaller than the first diameter of the first exhaust pathway, and configured to slidably engage in fluid-tight communication with the first exhaust pathway;
• and
• a second air intake pathway coaxially disposed around the second exhaust pathway and configured to slidably engage with the first air intake pathway, the second air intake pathway comprising:
• a projecting portion having a fourth diameter greater than the second diameter of the first air intake pathway and a second adjustable length equal to or greater than the first adjustable length of the first conduit;
• and
• a second adjustment mechanism defined on the projecting portion,
• wherein the first adjustment mechanism of the first conduit and the second adjustment mechanism of the second conduit are together configured to slidably couple the second conduit with the first conduit for a desired length of the vent attachment.

A vent attachment kit for a tankless water heater, the vent attachment kit comprising:

• a first conduit having a first exhaust pathway and a first air intake pathway coaxially disposed around the first exhaust pathway, the first conduit configured to couple with the tankless water heater;
• a second conduit having a second exhaust pathway and a second air intake pathway coaxially disposed around the second exhaust pathway, the second conduit configured to discharge exhaust gas to atmosphere and receive combustion air from the atmosphere;
• and
• an adjustable vent attachment configured to fluid tightly couple with the first conduit and the second conduit, the adjustable vent attachment comprising:
• an inner conduit configured to fluid tightly engage with the first exhaust pathway of the first conduit and the second exhaust pathway of the second conduit;
• a first outer conduit coaxially disposed around the inner conduit and configured to fluid tightly couple with the first air intake pathway of the first conduit, the first outer conduit comprising an adjustable portion having a first adjustable length and a first adjustment mechanism defined on the adjustable portion;
• and
• a second outer conduit coaxially and slidably disposed around the first outer conduit and configured to couple with the second air intake pathway of the second conduit, the second outer conduit comprising a projecting portion having a second adjustable length equal to or greater than the first adjustable length and a second adjustment mechanism defined on the projecting portion,
• wherein the first adjustment mechanism of the first outer conduit and the second adjustment mechanism of the second outer conduit are together configured to slidably couple the second conduit and the first conduit for a desired length of the adjustable vent attachment.