초록 ▼

Tubs are supplied with hot water through a water circulation system including a pump, an elongate electric flow-through heater, a water filter and piping connecting that pump, elongate flow-through heater and water filter in series in that water circulation system. The pump, elongate flow-through he

Tubs are supplied with hot water through a water circulation system including a pump, an elongate electric flow-through heater, a water filter and piping connecting that pump, elongate flow-through heater and water filter in series in that water circulation system. The pump, elongate flow-through heater and piping are arranged in a horizontal plane so that water flow passages in that piping, in the elongate flow-through heater and in the pump are intersected by that horizontal plane extending along directions of water flow in the mentioned water flow passages. The pump may be provided with a water inlet and a water outlet both lying in the same horizontal plane as the elongate flow-through heater and piping. The pump also may be provided with an axis of rotation, and even with an electric drive motor, extending in that horizontal plane. The elongate flow-through heater may be provided with an elongate structure molded of an electrically insulating synthetic resin for housing an electric heating element. A metal plate is sealed to that elongate housing structure at a lateral opening thereof in parallel to the above mentioned horizontal plane, as both a base for the electric heating element and as an electrically conductive complement of the electrically insulating housing structure.

대표청구항 ▼

In a method of providing a water heating system including an elongate electric flow-through heater, the improvement comprising in combination the steps of: providing an electric heating element for heating water in said elongate flow-through heater; providing an elongate housing structure extending

In a method of providing a water heating system including an elongate electric flow-through heater, the improvement comprising in combination the steps of: providing an electric heating element for heating water in said elongate flow-through heater; providing an elongate housing structure extending along a predetermined plane for encompassing said electric heating element, said elongate housing structure being provided at one end thereof with a water inlet lying in said horizontal plane and connected to a first part of said piping, and at the other end thereof with a water outlet lying in said horizontal plane and connected to a second part of said piping, and having a lateral opening extending from said water inlet to said water outlet in parallel to said predetermined plane for receiving said electric heating element therethrough; reducing thermal losses and corrodibility by molding said elongate housing structure of an electrically insulating corrosion-resistant synthetic resin; providing a metal plate extending from said water inlet to said water outlet in parallel to said predetermined plane as both a base for said electric heating element and as an electrically conductive complement of said electrically insulating elongate housing structure; and closing said laterally opening by sealing said metal plate to said elongate housing structure over said lateral opening in parallel to said predetermined plane while mounting said electric heating element with said metal plate in said housing structure extending along said predetermined plane.