03982552 is referenced by 8 patents and cites 7 patents.

A dishwashing machine having a gas-fired heater is provided with a flue structure having wall portions common to the tank and wash chamber of the machine. While the machine is running liquid splashes against these wall portions and exchanges heat therewith. When the water circulation system is stopped, the heater is limited to a standby condition which is predetermined to maintain these wall portions at substantially the same temperature as during running conditions.

Title
Thermal protection for dishwashing machine
Application Number
5/590431
Publication Number
3982552
Application Date
June 26, 1975
Publication Date
September 28, 1976
Inventor
Louis F Fraula
Troy
OH, US
Agent
Biebel French & Nauman
Assignee
Hobart Corporation
OH, US
IPC
B08B 3/02
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