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A heat exchanger apparatus includes a housing that defines a flow passage for a first fluid. The housing has a housing fluid inlet and a housing fluid outlet communicating with the flow passage. A first heat exchanger is located within the flow passage of the housing between the housing fluid inlet

A heat exchanger apparatus includes a housing that defines a flow passage for a first fluid. The housing has a housing fluid inlet and a housing fluid outlet communicating with the flow passage. A first heat exchanger is located within the flow passage of the housing between the housing fluid inlet and the housing fluid outlet. The first heat exchanger has a plurality of channels for transmitting a second fluid through the first heat exchanger. The heat exchanger apparatus also includes a flow diverter in the flow passage, between the housing fluid inlet and the first heat exchanger, for diverting some of the first fluid to a by-pass region of the flow passage that by-passes the first heat exchanger. As well, a flow control device is in communication with the housing fluid inlet and controls a volume and location of the first fluid entering the flow passage.

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1. A heat exchanger apparatus comprising: a housing defining a lateral flow passage for a first fluid, and having a housing fluid inlet and a housing fluid outlet communicating with the flow passage; the housing fluid inlet being formed to permit complete lateral fluid flow of the first fluid from t

1. A heat exchanger apparatus comprising: a housing defining a lateral flow passage for a first fluid, and having a housing fluid inlet and a housing fluid outlet communicating with the flow passage; the housing fluid inlet being formed to permit complete lateral fluid flow of the first fluid from the housing fluid inlet to the housing fluid outlet;a first heat exchanger located within the flow passage of the housing between the housing fluid inlet and the housing fluid outlet, the first heat exchanger having a plurality of channels for transmitting a second fluid therethrough;a second heat exchanger located within the flow passage of the housing between the first heat exchanger and the housing fluid outlet, the second heat exchanger having a plurality of channels for transmitting a third fluid therethrough, and wherein the second heat exchanger is spaced-apart from the first heat exchanger providing a first fluid mixing zone between the first heat exchanger and the second heat exchanger; the first fluid mixing zone permitting mixing of the first fluid after passing through the first heat exchanger;a downward inlet ramp formed from and at one end of a bottom wall of the housing and located between the housing fluid inlet and the first heat exchanger, the downward inlet ramp directing some of the first fluid to a by-pass region of the flow passage that bypasses the first heat exchanger, wherein the first fluid mixing zone permitting mixing of the first fluid after passing through the first heat exchanger with the first fluid from the by-pass region before flow through the second heat exchanger; anda flow control device coupled to an internal wall of the housing and in communication with the housing fluid inlet for controlling a volume and source of the first fluid entering the flow passage. 2. The heat exchanger apparatus of claim 1, wherein the housing bottom wall further comprises at a second end an upward outlet ramp, the upward outlet ramp directing the first fluid out of the flow passage. 3. The heat exchanger apparatus of claim 1, wherein the housing bottom wall further comprises two or more protrusions extending from the inner surface of the housing bottom wall, the two or more protrusions supporting a downstream edge of the first heat exchanger against forces applied by the flowing first fluid. 4. The heat exchanger according to claim 3, further comprising additional protrusions extending from the inner surface of the housing bottom wall, the additional protrusions supporting a downstream edge of the second heat exchanger against forces applied by the flowing first fluid. 5. The heat exchanger apparatus of claim 1, wherein the flow control device is a mixing valve that is configured to receive the first fluid from more than one source. 6. The heat exchanger apparatus of claim 5, wherein the mixing valve is configured to control the source of the first fluid based on a heating requirement. 7. The heat exchanger apparatus of claim 1, wherein the bottom wall of the housing further comprises a centrally located support member extending up from the inner surface of the bottom wall and across the width of the bottom wall for providing structural strength. 8. The heat exchanger apparatus of claim 7, wherein a gap is located between the centrally located support member and the first heat exchanger, the gap permitting the flow of the first fluid under the first heat exchanger and over the centrally located support member. 9. The heat exchanger apparatus of claim 1, wherein the first heat exchanger has a different configuration from the second heat exchanger. 10. The heat exchanger apparatus of claim 1, wherein the first heat exchanger and the second heat exchanger are positioned that space between a bottom wall of the housing and the first heat exchanger is greater than space between the bottom wall of the housing and the second heat exchanger.