34 a to the fluid in the supply path 26 a within the heat exchanger 18 a in this example the heat exchanger 18 a includes a substantial amount of nickel notably the size of the heat exchanger 18 a is smaller that in the prior art because the heating requirement is not as great as in the prior art this arrangement makes the heat exchanger smaller in three ways first less fluid needing thermal energy transfer flows through the heat exchanger because some is provided through the ejector second the fluid in the heat exchanger need only be raised to a lesser temperature in that it will be mixed with a hotter fluid to obtain the desired temperature third the difference in temperature between the two fluids within the heat exchanger is greater the colder fluid having been heated to a lesser value which enables the heat exchanger to transfer heat more proficiently after moving through the heat exchanger 18 a additional thermal energy in the fluid moving along the exhaust path 34 a may be used as customer heat at 54 or expelled into the surrounding environment at 58 in this example the ejector 22 a is downstream from the heat exchanger 18 a relative to flow along the supply path 26 a other examples may include other arrangements of the ejector 22 a relative to the heat exchanger 18 a the example ejector 22 a utilizes the flow of fluid along the supply path 26 a to withdraw fluid from the exhaust path 34 a the blower 50 provides the head for the ejector 22 a to withdraw the fluid from exhaust path 34 a the ejector 22 a is subsonic.