Specifications

14
Modular/Multiple
Boiler Concept
Modular/multiple boiler systems
put the efficiency, cost, and service
advantages of compact gas boilers to
work in heating applications where
a single commercial boiler would not
be sufficient. The systems connect any
number of compact, self-contained gas
boilers together and step-fire them
to efficiently meet heating loads on
demand.
Firing to Load Demand
Minimizes Standby Losses
Maximum fuel utilization is achieved
during long periods of full firing at the
design temperature for each boiler. In
comparison, a single large boiler would
cycle on and off, more frequently during
partial loads, not reaching its rated
efficiency.
During 90% of the average heating
season less than 65% of the total
heating capacity is required. Step-firing
activates only those boilers needed to
meet the load demand which reduces
cycling and increases annual fuel
efficiency.
Testing conducted by the National
Bureau of Standards verifies that
the efficiency of boilers piped
primary/secondary surpasses that of
boilers piped in parallel, and single
large gas boilers—by up to 10%.
Prefabricated water manifolds with
flex-couplings are available from
Burnham Commercial for either
2 or 3 module installations. Pre-
fabricated manifolds can be used for
primary-secondary or parallel piping
arrangements.
The Lower Cost, Higher Efficiency
Alternative to Single Commercial Boilers
Features & Benefits
Choosing a modular or multiple boiler
system can have many benefits.
• Cost Savings
The basic cost of a modular/
multiple system is less than that of
a single large boiler of
equal capacity in most applications.
• Compact Design
Lighter weight boilers are suitable
for installation on any floor from
basement to penthouse. A floor
shield is required when installed on
a combustible floor.
- Hand truck the boilers through
standard doorways.
- Install the boiler during any phase
of construction.
• Two Packaging Options
Packaged and pre-wired for quick
and simple installation or knock
down with sections assembled, for
easy movement into the boiler
room.
• Controls are simple to set-up,
operate and service.
• Standby safety—service one boiler
while the others carry the load.
• Provision for expansion.
Spec the Right Piping to
Preserve Efficiency
Burnham Commercial recommends
primary-secondary piping to maximize
energy efficiency. Primary-secondary
piping reduces off-cycle heat loss
by delivering a positive balanced
water flow only through each fired or
cycling boiler. It also requires only a
single header and less piping, which
reduces installation cost and time.