Secondary circulation system

US4682581A · kind A · utility

Inventors

• Karsten Laing · Althütte, DE
• Doerte Laing · Spaichingen, DE
• Birger J. Laing · Glückstadt, DE

Key dates

• Filing date: Feb 13, 1986
• Grant date: Jul 28, 1987
• Expiry date: Feb 13, 2006

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F24D17/0078
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

A domestic hot water system in which the remote end forms a loop connected to the hot water tank and in which a pump circulates hot water at a rate sufficient to prevent cooling of the water in the piping below a predetermined temperature, so that hot water can flow immediately out of all outlets.