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Weil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners
Before Installing Boiler
1b
Provide clearances for servicing
around boiler:
• Back, for breeching - 30 inches.
• Left side, for cleaning and tankless heater
removal - 34 inches
• Allow sufficient space on remaining sides
for cleaning, servicing and burner
installation. See burner literature for length.
• Clearance from vent pipe to combustible
materials:
- singlewall vent pipe - 18 inches
- doublewall vent pipe - refer to vent pipe
manufacturer’s recommendations for vent
pipe clearances
Lay a foundation, if needed:
Floor construction and condition must be
suitable for weight of boiler when filled with
water. See page 31 for boiler weight/water
weight.
A level concrete or brick foundation is
required when:
• A floor could possibly become flooded
• Non-level conditions exist
Part No. 550-141-705
4
Boiler Foundation Length Table
Boiler “L” Boiler “L”
Model Inches Model Inches
378 23 878 58
478 30 978 65
578 37 1078 72
678 44 1178 79
778 51 1278 86
2" Min.
“L”
30"
Figure 3 Boiler Foundation