(57) A hydraulic valve assembly (13*) for wall-mounted boilers (11), wherein a secondary
heat exchanger (20) represents an assemblage plate, mounted on which are, by means
of fast-coupling mechanical devices ((SHR1), (SHR2)):
- a first, central, sub-assembly (STG1) basically comprising a pump (26);
- a second, lateral, sub-assembly (STG2) comprising some elements belonging to a secondary
circuit (C2) for the distribution of sanitary water; and
- a third, lateral, sub-assembly (STG3) comprising some elements belonging to a primary
circuit (C1) for distribution of heating water in premises.
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