Vertical heat recovery steam generator

A vertical heat recovery steam generator, low-pressure stages of which are designed as a once-through system, comprising:

• a condensate preheater with at least one condensate preheater heating surface, through which a flow medium flows and which is disposed in a hot gas channel, through which hot gas flows,
• a low-pressure preheater with at least one low-pressure preheater heating surface, through which the flow medium flows and which is disposed in the hot gas channel,
• a low-pressure evaporator with at least one low-pressure evaporator heating surface, through which the flow medium flows and which is disposed in the hot gas channel,
• wherein the flow medium flows successively through the at least one low-pressure preheater heating surface and the at least one low-pressure evaporator heating surface in one pass and without additional pressure compensation and wherein a first of the at least one low-pressure preheater heating surfaces in the hot gas channel is disposed in a region of a hot gas channel outlet and after a first of the at least one condensate preheater heating surfaces in the hot gas direction or largely in the same region as the first of the at least one condensate preheater heating surfaces.