direction of the cover 17 as shown in fig4 on the right fig5 shows in a cross section along the line i i of fig4 in the plane of the shallow coil 12 the allocation of the individual lines and coils and of the impingement baffle 16 and re circulation baffle 18 according to a further illustrative embodiment of the invention according to fig6 to 8 a second heat exchanger for adaptation to the particular output of the high pressure boiler 1 fig6 is arranged on the vessel 8 of the heat exchanger in such a way that a pipe section 20 results the pipe section 20 and the vessel 8 being mutually joined via ring flanges 22 23 in fig7 such a heat exchanger 8 according to the invention in conjunction with the pipe section 20 is shown in a longitudinal section the additional heat exchanger part provided according to the invention is disposed in a pipe section 20 this pipe section 20 is provided with an upper ring flange 21 to which a cover 17 is connected the condensate line 4 and a feed water feed line 6 34 end in the cover part 17 through a feed water discharge line 9 34 likewise disposed on the cover 17 the feed water is passed back to the boiler 1 the cooled condensate is passed to the feed water tank 5 by means of a condensate line 10 arranged on the vessel 8 the feed water feed line 6 34 or 6 39 extends from the cover 17 down to the lowest point of the vessel 8 and then.