Jeffrey J Crisafulli

US Patent:

56879083, Nov 18, 1997

Filed:

Feb 16, 1996

Appl. No.:

8/602636

Inventors:

Sherwood G. Talbert - Columbus OH
Ronald A. Cudnik - Westerville OH
Jeffrey J. Crisafulli - Columbus OH

Assignee:

Gas Research Institute - Chicago IL

International Classification:

F24H 302

US Classification:

237 19

Abstract:

A single system for providing heated water at two different temperature levels for space heating purposes and for domestic water heating purposes is provided. The system can be constructed using only one burner. The system features a first loop for circulating domestic hot water at a lower temperature from an insulated tank, through a first heat exchanger where the water is heated, and back into the insulated tank. The system also features a second loop for circulating space heating water at a different temperature through a second heat exchanger, where the water is cooled, through the first heat exchanger, where the water is heated, and back to the second heat exchanger, where the water is again cooled. A single diverter valve or equivalent is used to determine which heating loop is required and will be activated.