Rooftop water heater

摘要

A water heater adapted to be mounted on the rooftop of a building includes a substantially cylindrical tank having a horizontally-oriented longitudinal axis. A U-shaped flue tube has a burner end and an exhaust end, both ends being mounted in a head portion of the tank. The legs of the flue tube define a flue plane that is preferably angled 30°-60° with respect to vertical. An inlet tube and an outlet tube also extend through the head of the tank. The inlet tube is positioned at the bottom of the tank and has holes that open downwardly only; the outlet tube is positioned at the top of the tank and has holes that open upwardly only. The tank is weather-tightly enclosed by a cabinet. A base member of the cabinet is supported by a roof curb and supports the water tank. The base member includes a drain opening for draining water from the inside the cabinet to the sewage system of the building, and a water pipe opening through which extend a plurality of pipes communicating with the tank. A grommet weather-tightly seals the pipes with respect to the base member.