Hot water supply for tubs

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.