Specifications

20
and lower fuel costs. Their compact design makes the
sections easier to handle and assemble. Series 5B sec-
tions are easily maneuvered through standard doorways.
The Cast Iron Nipple Difference
Series 5B boiler sections are joined with durable cast iron
nipples that last the life of the boiler.
Nipples expand and contract along
with the sections they join, ensur-
ing the integrity of the entire section
assembly.
Unlike gaskets, commonly used in some competitors’
boiler assemblies, cast iron nipples resist petroleum based
chemicals, including corrosion inhibitors, pump lubricants
and antifreeze. Nipples do not break down from contact
with boiler flue gases.
Commitment to Quality
Burnham Commercial, "America's Boiler Company,"
has earned a reputation for quality and dependability.
Built for a variety of applications, the Series 5B is right
for your next job. Consult your local Burnham Com-
mercial sales representative or visit our new website,
www.burnhamcommercialcastiron.com for details.
Series 5B - Hot Water or Steam Boiler
Maximum Allowable Working Pressure (MAWP): 50 PSI-Water; 15 PSI-Steam
The Burnham Commercial Series 5B boiler offers heating
capacities and features that make it ideal for commercial,
institutional and high rise residential heating applica-
tions. The rear outlet drafthood is specifically suited to
installations with low ceiling heights.
The Series 5B boiler is rated at 50 PSI water or 15 PSI
steam and has a combustion efficiency of 80%, meeting
the requirements of ASHRAE 90.1.
Cast Iron Dependability
All Burnham Commercial boilers
are designed for long term reliabil-
ity and trouble-free performance.
The Series 5B boiler is constructed
with durable high silicone cast iron
sections. Cast iron has the unique
ability to absorb and transfer heat
quickly and efficiently while provid-
ing unmatched durability. The pinned heating surface and
vertical flue design extracts maximum heat while main-
taining low draft losses — this results in higher efficiency
Quality You Can Count On
Tankless Heater Data - Water Boilers Only
HEATER
NUMBER
FOR
USE IN
BOILERS:
CONTINUOUS DRAW
HEATER RATINGS
40°-140° RISE W/
200° F BOILER TEMP.
PRESSURE
DROP
THROUGH
HEATER
CLEARANCE
REQUIREMENT
FOR HEATER
REMOVAL
AT-2 All Sizes 4-1/2 GPM 8.8 PSI 27"
AT-3 All Sizes 5 GPM 18.0 PSI 32"
AT-4 5008 and larger 6 GPM 1.2 PSI 42"
Piping to heater(s) should run at side(s) or rear of
boiler. Piping at rear of boiler should not interfere
with removal of upper rear panel(s) for access to
flueways for cleaning. Piping to accomodate two
heaters must be proportionally sized in both cold
and hot water supply headers to match heater rat-
ings necessary for maximum hot water delivery at
minimum pressure drop.
Hot Water Supply Boiler Capacity
All Series 5B boilers are furnished with left and right heater end sections. It is possible to
install a heater in both ends provided the number of sections in the boiler is not less than
the sum of the number of sections required for each heater as indicated below.
Example: AT-3 + AT-4 heater=6+8=14 sections or larger boiler required.
AT-2 Heater—5 Sections
AT-3 Heater—6 Sections
AT-4 Heater—8 Sections
BOILER NO.
HEATER NO.
5006B
AT-3
5007B
AT-3
5008B
AT-4
5009B
AT-4
5010B
AT-4
5011B
AT-2 &
AT-3
5012B
(2) AT-3
5013B
(2) AT-3
5014B
(2) AT-3
5015B
(2) AT-3
5016B -
5026B
(2) AT-4
GPH PSI GPH PSI GPH PSI GPH PSI GPH PSI GPH PSI GPH PSI GPH PSI GPH PSI GPH PSI GPH PSI
60° F Rise
80° F Rise
100° F Rise
500
375
300
40
26
18
500
375
300
40
26
18
600
450
360
12
3.2
1.2
600
450
360
12
3.2
1.2
600
450
360
12
3.2
1.2
950
713
570
37.5
24.5
16.5
1000
750
600
41
26
18
1000
750
600
41
26
18
1100
826
660
47.5
30
21
1100
826
660
47.5
30
21
1200
900
720
11
3.2
1.2
Ratings for hot water supply are based on the gross output of the boiler. PSI column indicates pressure drop through tankless heater.