ergo-online: Fachinformationsdienst Arbeit und Gesundheit, Schwerpunkt Bildschirmarbeit.

A flue gas heat recovery system for dwelling hot water heating system boilers is disclosed. The system comprises a heat exchanger disposed in a flue for exhausting combustion products from the boiler and a circulating pump for circulating cooled water from the heating system through the exchanger to be warmed by the combustion products. The system includes a by-pass line for by-passing the heat exchanger, and control valves for varying the amount of cooled water diverted around the heat exchanger.