Patent ID: 6647932
Filing Date: 2003-11-18
Classification: F24H

Abstract:
A boiler for providing a hot fluid comprising:a first heat exchanger configured to exchange heat between at least one first fluid and a heat source and having a first cold fluid intake configured to inlet the first fluid into the first heat exchanger and a first hot fluid outlet configured to outlet the first fluid from the first heat exchanger; a second heat exchanger configured as at least part of the first heat exchanger and configured to exchange heat between the first and a second fluid and having a second cold fluid intake configured to inlet the second fluid into the second heat exchanger and a second hot fluid outlet configured to outlet the second fluid from the second heat exchanger; and a three way valve configured to selectively divert fluid from at least one of the first hot fluid outlet and a circuit to the first cold fluid intake, and wherein the three way valve also provides fluid to the first cold fluid intake from at least one of a fluid source, directly from the first hot fluid outlet, and fluid that has circulated through the circuit.