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1
Product Description, Specifications and Dimensional Data
Apex Series boilers are condensing high efficiency
gas-fired direct vent hot water boilers designed for
use in forced hot water space or space heating with
indirect domestic hot water heating systems, where
supply water temperature does not exceed 210°F.
These boilers have special coil type stainless steel
heat exchangers, constructed, tested and stamped
Table 1-1: Specifications
Specification
Altitude (ft. above sea level)
Fuel
Max. Allowable Water Temperature (°F)
Max. Allowable Working Pressure (psi)
Factory Supplied Safety Relief Valve (psi)
Boiler Water Volume (gal.)
Heat Transfer Area (sq. ft.)
Approx. Shipping Weight (lb.)
*
Optional 80 psi and 100 psi safety relief valves are available for all models.
Follow Instructions for High Altitude Installations above 2,000 ft. (see Appendix A)
1
APX525C LP cannot be installed above 6,000 ft.
2
APX725C LP cannot be installed above 7,800 ft.
3
APX825C natural gas cannot be installed above 6,000 ft. APX825C LP can be installed up to 10,100 ft.
4
Table 1-2: Dimensions (See Figures 1-3, 1-4, and 1-6)
Dimension
A - Inch
(mm)
B - Inch
(mm)
C - Inch
(mm)
D - Inch
(mm)
E - Inch
(mm)
Gas Inlet G - Inch
Return H - Inch
Supply J - Inch
PP Condensate Drain K - Inch
PVC Combustion Air Connector - Inch
CPVC/PP/SS Vent Connector - Inch
(mm)
4
APX425C
0-10,100
1
Shipped for Natural Gas, Field
Converted for LP Gas
210
160
*
50
3.4
41.8
316
APX425C
APX525C
31-3/16
(792)
(1,181)
5-1/2
(140)
12-3/8
21-5/16
(314)
23
34-13/16
(584)
15-1/8
28-5/16
(384)
3/4 (FPT)
1-1/2 FPT
1-1/2 FPT
4
(100)
APEX
Installation, Operating, & Service Instructions
per Section 4 'Heating Boilers' of ASME Boiler and
Pressure Vessel Code, which provide a maximum
heat transfer and simultaneous protection against
flue gas product corrosion. These boilers are not
designed for use in gravity hot water space heating
systems or systems containing significant amount
of dissolved oxygen (swimming pool water heating,
direct domestic hot water heating, etc.).
Boiler Model
APX525C
APX625C
0-10,100
0-10,100
2
Shipped for Natural Gas or Shipped for LP
Gas (no Field Conversion)
210
210
160
160
50
60
4.3
5.4
58.1
76.2
368
458
Boiler Model
APX625C
46-1/2
49-1/2
(1,258)
N/A
N/A
23-1/4
(541)
(591)
38-1/16
(884)
(967)
30-7/8
(719)
(784)
2 MPT
2 MPT
3/4 PVC Compression Coupling
4
APX725C
APX825C
0-10,100
0-6,000
3
210
210
160
160
60
60
5.4
6.2
76.2
87.0
458
500
APX725C
APX825C
49-1/2
53-5/16
(1,258)
(1,258)
N/A
N/A
23-1/4
23-7/16
(591)
(596)
38-1/16
41-3/16
(967)
(1,046)
30-7/8
32-9/16
(784)
(827)
1 (FPT)
6
(150)
106308-05 - 3/23
4
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