Question: De Dietrich Remeha, is one of Europe's biggest manufacturers and distributors of domestic and commercial water and space heating systems, in July 2009, when heavily laden with debt, which of Europe's largest manufacturers and distributors of domestic and commercial water and space heating systems, agreed to merge with them? 
Sentence (from "De Dietrich Remeha"): De Dietrich Remeha is one of Europe's biggest manufacturers and distributors of domestic and commercial water and space heating systems.
Relevant evidence: No