Gas Condensing Boiler
100, 151 Combi Boiler
57, 100, 131, 151 Heating Boiler
Improper installation, setup, modiﬁ cation, operation or
maintenance of the heating system can cause personal
injury and property damage.
Follow each appliances' instructions precisely.
For assistance or further information, contact a trained
and certiﬁ ed installer, service provider, or the gas
In Massachusetts, the boiler must be installed by a
licensed plumber or gas ﬁ tter.
Application drawings in this manual are conceptual only
and do not purport to address all design, installation,
code, or safety considerations.
The diagrams in this manual are for reference use by
code ofﬁ cials, designers and licensed installers. It is
expected that installers have adequate knowledge of
national and local codes, as well as accepted industry
practices, and are trained on equipment, procedures,
and applications involved. Drawings are not to scale.
Refer to the boiler, control and module installer manuals
for additional detailed information!