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Hot Water Boilers - 125 PSI Atmospheric / Natural Gas Fired


Rite Atmospheric Natural Gas Fired Watertube Boilers are found at the heart of better engineered closed-loop heating systems all over North America. From conventional space heating systems to heat pumps to industrial process loads, Rite offers 47 basic models, ranging from 480 to 12,499 MBH Input (11 - 300 Boiler Horsepower). These heavy duty, long lasting boilers have been providing heat to schools, churches, commercial buildings, metal finishers and silicone chip makers (to name a few) – Safely and reliably for over fifty years.

So simple to maintain and operate, Rite Boilers feature complete waterside access so that virtually all scale and mud deposits can be seen and mechanically cleaned during a single scheduled maintenance shutdown. The result – Better fuel efficiency and lower operating cost over the life of your boiler investment. Consider a few of our other standard features: Floating heads that eliminate pressure vessel cracks and broken welds caused by thermal stress cycling (backed by Rite’s 25 year Thermal Shock Warranty), Single Stacks on models to 7,500,000 BTUH input, Top supply and return water connections, Rugged Heat Exchangers with minimal pressure drop at normal flow rates are safe to operate at any flow rate. Rite’s bolted/gasketed headplates that eliminate any possibility of hydraulic explosion in the event that safety devices fail – and you have a better boiler by design.

ATMOSPHERIC BURNER ADVANTAGES

Rite Atmospheric Boilers are an excellent choice when: Low NOx emissions are not required, natural gas or L. P. will be the only fuels used, and when lower combustion efficiencies at less than full firing rate are acceptable.

Atmospheric burners are far less expensive than power burners, so when the above criteria is met, then Atmospherics are a strong economical alternative to Rite’s outstanding line of power burner fired water boilers. Other factors favoring Atmospherics are: Extremely low electrical power consumption (no pre or post blower fan energy loss), Rapid start-up on demand (No pre-purge blower fan), Lighter weight, Lower height, and Whisper-quiet burner operation. For extra energy savings, specify automatic stack dampers and insulated head plates.

Atmospheric Hot Water Boiler

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Models and Ratings


Stack / Draft Requirements

  • UL listed for use with Type B Vent.
  • Minimum stack height for natural or L.P. gas fired burners is 10 feet.
  • The stack should be supported independently of the boiler and an adjustable length section of stack should be installed after the draft control to allow for future separation. All Rite Boilers have internal stack supports to handle the weight of the stack during installation.
  • Boilers with barometric damper draft control should draft between -.05” to -.09” W.C. when firing. Boilers with draft diverters will draft between -.02” to -.04” W.C.
  • A draft gauge is installed on all boilers equipped with barometric dampers to help set and maintain the draft.

Air Requirements

  • Adequate Combustion/Ventilation Air is vital for safe, efficient operation. Refer to the latest edition of the Uniform Mechanical Code or consult your local Building and Safety Department for specific requirement. Warning: Do not install in a room that will develop negative pressure without utilizing a properly sized induced draft fan.

Electrical Requirements

  • A Single Point 120/60/15 AMP supply to the electrical panel is suggested.

Natural Gas Supply Requirements (Static and at Flow)

  • Models 15 W - 76 W: 6” w.c. min. to 14” w.c. max.
  • Models 85 W - 400 W: 7” w.c. min. to 28” w.c. max.
  • Models 425 W - 750 W: 15” w.c. min. to 28” w.c. max.
  • Models 840 W - 1250 W: 20” w.c. min. to 28” w.c. max.
  • For other gas pressures, consult factory or your Rite Representative.

Propane Supply Requirements: 11" w.c. min. to 14" w.c. max.

Water Temperatures & Pressure Drops

  • Minimum return water temperature is 135˚F (after start-up). Lower temperature return factory options available.
  • Maximum practical supply water temperature is 235˚F. Higher temperature/pressure Rite Boilers available.
  • Pressure drop for all models is less than 3 feet of total head.

Elevation Deration

Ratings given below are for elevations up to 2000 feet. Above 2000 feet, ratings should be reduced at the rate of 4% for every 1000 feet above sea level has no bearing on "efficiency".

BTU Formula

  • BTU Output @ 0-2000’ elevation = 60 x 8.3 x DT x G.P.M.

Information in the table below is subject to change during website development. Please contact Rite with issues or questions.

BOILER MODEL
Input MBH
MBH (Output)
E.D.R.
Boiler Horsepower
Heating Surface Sq. Ft.
Water Content Gallons
G.P.M. 20°F Rise
G.P.H. 100°F Rise
Nominal Shipping Weight (lbs)
15 W
150
120
750
4
14
8.5
12
145
540
20 W
200
160
1000
5
19
9.7
16
195
610
25 W
250
200
1250
6
22
10.6
20
240
680
30 W
300
240
1500
7
28
12
24
290
760
35 W
360
288
1800
9
33
13.4
29
350
870
42 W
420
336
2100
10
39
14.7
34
405
960
48 W
480
384
2400
11
49
21
38
465
1080
55 W
550
440
2750
13
56
23
44
535
1285
63 W
630
506
3162
15
63
24
51
615
1390
76 W
760
608
3800
18
75
27
61
740
1530
A90 W
900
720
4500
21
89
31
72
875
1700
85 W
850
680
4250
20
88
40
69
830
1735
90 W
900
720
4500
21
88
40
72
875
1735
105 W
1050
840
5250
25
101
43
84
1015
1865
120 W
1200
960
6000
28
115
47
97
1165
2000
135 W
1350
1080
6750
32
131
50
110
1315
2140
150 W
1500
1200
7500
35
145
54
120
1460
2265
165 W
1650
1320
8250
39
159
57
135
1600
2400
180 W
1800
1440
9000
43
174
61
145
1750
2510
200 W
2000
1600
10000
47
192
66
160
1950
2700
A150 W
1500
1200
7500
35
160
71
120
1460
2430
A165 W
1650
1320
8250
39
168
75
135
1600
2550
A180 W
1800
1440
9000
43
190
79
145
1750
2735
A200 W
2000
1600
10000
47
205
83
160
1950
2960
225 W
2250
1800
11250
53
230
89
180
2190
3160
250 W
2500
2000
12500
59
252
94
200
2430
3365
275 W
2750
2200
13750
65
273
100
220
2670
3590
300 W
3000
2400
15000
71
295
105
240
2920
3815
325 W
3250
2600
16250
77
318
111
265
3160
4040
350 W
3500
2800
17500
83
340
116
285
3400
4265
375 W
3750
3000
18750
89
362
122
305
3650
4490
400 W
4000
3200
20000
95
383
127
325
3900
4715
425 W
4250
3400
21250
101
405
133
345
4140
4940
450 W
4500
3600
22500
107
428
139
365
4380
5160
475 W
4750
3800
23750
113
450
145
385
4630
5385
500 W
5000
4000
25000
119
473
151
405
4870
5610
550 W
5500
4400
27500
131
526
190
445
5370
6120
600 W
6000
4800
30000
143
574
213
485
5850
6630
A650 W
6500
5200
32500
155
622
240
520
6250
7040
A700 W
7000
5600
35000
167
670
255
560
6720
7550
A750 W
7500
6000
37500
180
722
270
600
7200
8060
A400 W
4000
3200
20000
95
390
160
325
3900
4900
A450 W
4500
3600
22500
107
440
180
365
4380
5360
A500 W
5000
4000
25000
119
486
195
405
4870
5815
A550 W
5500
4400
27500
131
535
215
445
5370
6275
A600 W
6000
4800
30000
143
584
235
485
5850
6760
650 W
6500
5200
32500
155
632
250
520
6250
7245
700 W
7000
5600
35000
167
680
275
560
6720
7750
750 W
7500
6000
37500
180
730
290
600
7200
8240
840 W
8400
6700
41875
200
800
320
650
7800
8670
940 W
9400
7500
46875
225
900
345
770
9270
9280
1050 W
10500
8400
52500
250
1000
370
810
9740
9945
1150 W
11500
9200
57500
275
1100
395
925
11000
10500
1250 W
12499
9999
62494
300
1200
420
1005
12100
11220

Add G for natural gas or propane O for #2 oil or GO for combination gas #2 oil.

NOTE: Equivalent Direct Radiation (EDR), measured in terms of square feet, is a standardized comparison method estimating the output ability of boilers and radiators.

For Steam Systems: 1 square foot EDR will emit 240 BTUs/hr.
*Rating based on approximately 212° F (100° C) temperature and 1-2 psi of pressure.

For Hot Water Systems: 1 square foot EDR will emit 160 BTUs/hr.

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Models and Dimensions


Atmospheric Hot Water Boiler Diagram

  • DIMENSIONS ARE IN INCHES - SUBJECT TO PRODUCTION TOLERANCES AND CHANGE WITHOUT NOTICE. CERTIFIED DIMENSIONS AVAILABLE UPON REQUEST.
  • BOILERS APPROVED FOR INSTALLATION ON NON - COMBUSTIBLE FLOORS ONLY.

1Draft Diverters are supplied on Models 48W-120W only. Barometric Dampers will be shipped one size smaller than D dimension for stacks up to 25 feet of vertical height (as shown in column E) full size (same as D dimension) for stacks 25-50 feet tall and one size larger for stacks over 50 feet tall. Barometric Damper Tee by others.

2May vary-sizes shown are for UL gas trains at standard supply pressures. Gas connections can be male or female NPT. All other threaded connections are female NPT except where noted.

3Flanges are ANSI 150 lb. SA-105 raised face.

4Standard right hand construction shown illustrated above. Left hand construction available at no extra charge.

Information in the table below is subject to change during website development. Please contact Rite with issues or questions.

BOILER MODEL
A
B
C
COA
D
E
F
H
J
K
L
N
S
T
Length Jacket
Width Jacket
Height Flush
Height Overall
Stack Dia.
Draft Control
Twin Stack
Tube Maint.
Gas Conn.
Water Supply
Water Return
Side Space
Drain
Head Swing
15 W
22
21
48
57
6
21
-
15
3/4
1-1/2 MNPT
1-1/2 MNPT
8
3/4
14
20 W
27
21
48
57
6
28
-
20
3/4
1-1/2 MNPT
1-1/2 MNPT
8
3/4
14
25 W
31
21
48
57
7
29
-
24
3/4
1-1/2 MNPT
1-1/2 MNPT
8
3/4
14
30 W
37
21
48
57
8
30
-
30
3/4
1-1/2 MNPT
1-1/2 MNPT
8
3/4
14
35 W
43
21
48
57
9
31
-
36
3/4
1-1/2 MNPT
1-1/2 MNPT
8
3/4
14
42 W
49
21
48
57
9
31
-
42
3/4
1-1/2 MNPT
1-1/2 MNPT
8
3/4
14
48 W
40
26
48
57
9
9 D.D. (33)
-
40
0.75
2 MNPT
2 MNPT
10
1.00
20
55 W
45
26
48
57
10
10 D.D. (34)
-
45
1.00
2 MNPT
2 MNPT
10
1.00
20
63 W
50
26
48
57
10
10 D.D. (34)
-
50
1.00
2 MNPT
2 MNPT
10
1.00
20
76 W
58
26
48
57
12
12 D.D.(36)
-
58
1.00
2 MNPT
2 MNPT
10
1.00
20
A90 W
68
26
48
57
12
12 D.D. (36)
-
68
1.00
2 MNPT
2 MNPT
10
1.00
20
85 W
46
32
52
61
12
12 D.D.(36)
-
46
1.00
3 FL
3 FL
12
1.25
26
90 W
46
32
52
61
12
12 D.D.(36)
-
46
1.00
3 FL
3 FL
12
1.25
26
105 W
52
32
52
61
14
14 D.D.(38)
-
52
1.00
3 FL
3 FL
12
1.25
26
120 W
58
32
52
61
14
14 D.D.(38)
-
58
1.25
3 FL
3 FL
12
1.25
26
135 W
64
32
52
61
14
12 BARO
-
64
1.25
3 FL
3 FL
12
1.25
26
150 W
70
32
52
61
14
12 BARO
-
70
1.25
3 FL
3 FL
12
1.25
26
165 W
76
32
52
61
14
12 BARO
-
76
1.25
3 FL
3 FL
12
1.25
26
180 W
82
32
52
61
16
14 BARO
-
82
1.25
3 FL
3 FL
12
1.25
26
200 W
90
32
52
61
16
14 BARO
-
90
1.50
3 FL
3 FL
12
1.25
26
A150 W
55
42
57
66
14
12 BARO
-
55
1.25
4 FL
4 FL
14
1.50
34
A165 W
59
42
57
66
14
12 BARO
-
59
1.50
4 FL
4 FL
14
1.50
34
A180 W
65
42
57
66
16
14 BARO
-
65
1.50
4 FL
4 FL
14
1.50
34
A200 W
69
42
57
66
16
14 BARO
-
69
1.50
4 FL
4 FL
14
1.50
34
225 W
73
42
57
66
18
16 BARO
-
73
1.50
4 FL
4 FL
16
1.50
34
250 W
79
42
57
66
18
16 BARO
-
79
2.00
4 FL
4 FL
16
1.50
34
275 W
85
42
57
66
18
16 BARO
-
85
2.00
4 FL
4 FL
16
1.50
34
300 W
91
42
57
66
20
18 BARO
-
91
2.00
4 FL
4 FL
16
1.50
34
325 W
97
42
57
66
20
18 BARO
-
97
2.00
4 FL
4 FL
16
1.50
34
350 W
103
42
57
66
20
18 BARO
-
103
2.00
4 FL
4 FL
16
1.50
34
375 W
109
42
57
66
20
18 BARO
-
109
2.00
4 FL
4 FL
16
1.50
34
400 W
115
42
57
66
22
20 BARO
-
115
2.00
4 FL
4 FL
16
1.50
34
425 W
121
42
57
66
22
20 BARO
-
121
2.00
4 FL
4 FL
16
1.50
34
450 W
127
42
59
68
22
20 BARO
-
127
2.00
4 FL
4 FL
16
1.50
34
475 W
133
42
59
68
24
20 BARO
-
133
2.00
4 FL
4 FL
16
1.50
44
500 W
139
42
59
68
24
20 BARO
-
139
2.00
4 FL
4 FL
16
1.50
34
550 W
109
51
64
73
26
24 BARO
-
109
2.50
4 FL
4 FL
16
2.00
44
600 W
118
51
64
73
26
24 BARO
-
118
2.50
4 FL
4 FL
16
2.00
44
A650 W
129
51
64
73
28
24 BARO
-
129
2.50
5 FL
5 FL
16
2.00
44
A700 W
138
51
64
73
28
24 BARO
-
138
2.50
5 FL
5 FL
16
2.00
44
A750 W
147
51
64
73
30
28 BARO
-
147
2.50
5 FL
5 FL
16
2.00
44
A400 W
79
63
63
72
22
20 BARO
-
79
2.00
4 FL
4 FL
16
2.00
56
A450 W
87
63
63
72
22
20 BARO
-
87
2.00
4 FL
4 FL
16
2.00
56
A500 W
95
63
63
72
24
20 BARO
-
95
2.00
4 FL
4 FL
16
2.00
56
A550 W
102
63
63
72
26
24 BARO
-
102
2.50
4 FL
4 FL
16
2.00
56
A600 W
109
63
63
72
28
24 BARO
-
109
2.50
4 FL
4 FL
16
2.00
56
650 W
117
63
63
72
28
24 BARO
-
117
2.50
5 FL
5 FL
16
2.00
56
700 W
124
63
63
72
28
24 BARO
-
124
2.50
5 FL
5 FL
16
2.00
56
750 W
132
63
63
72
30
28 BARO
-
132
2.50
5 FL
5 FL
16
2.00
56
840 W
115
77
63
72
(2)24
(2) 20 BARO
23
115
2.50
6 FL
6 FL
18
2.00
69
940 W
128
77
63
72
(2)24
(2) 20 BARO
26
128
2.50
6 FL
6 FL
18
2.00
69
1050 W
140
77
63
72
(2)26
(2)24 BARO
29
140
2.50
6 FL
6 FL
18
2.00
69
1150 W
152
77
63
72
(2)26
(2)24 BARO
32
152
2.50
6 FL
6 FL
18
2.00
69
1250 W
164
77
63
72
(2)26
(2)24 BARO
35
164
2.50
6 FL
6 FL
18
2.00
69

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Atmospheric / Natural Gas Burner Emissions


Boiler No.
Input Btu/hr. x 1000
NOx Emission ppm
NOx Emission lb./mmBtu
NOx Emission lb./hr.*
CO Emission ppm
CO Emission lb./mmBtu
CO Emission lb./hr.*
VOC Emission ppm
VOC Emission lb./mmBtu
VOC Emission lb./hr.*
Particulates lb./mmBtu
Particulates lb./hr.*
48
480
195
0.24
0.1133
40
0.031
0.01498
2
0.0016
0.0007
0.003
0.001440
55
550
195
0.24
0.1298
40
0.31
0.01716
2
0.0016
0.0009
0.003
0.001650
63
630
195
0.24
0.1482
40
0.031
0.01498
2
0.0016
0.0007
0.003
0.001440
76
760
195
0.24
0.1793
40
0.31
0.02371
2
0.0016
0.0012
0.003
0.002280
85
850
195
0.24
0.2006
40
0.031
0.02652
2
0.0016
0.0013
0.003
0.002550
90
900
195
0.24
0.2124
40
0.31
0.02808
2
0.0016
0.0014
0.003
0.002700
105
1050
195
0.24
0.2477
40
0.031
0.03276
2
0.0016
0.0016
0.003
0.003150
120
1200
195
0.24
0.2831
40
0.31
0.03744
2
0.0016
0.0019
0.003
0.003600
135
1350
195
0.24
0.3185
40
0.031
0.04212
2
0.0016
0.0021
0.003
0.004050
150
1500
195
0.24
0.3539
40
0.31
0.04680
2
0.0016
0.0023
0.003
0.004500
165
1650
195
0.24
0.3893
40
0.031
0.05148
2
0.0016
0.0026
0.003
0.004950
180
1800
195
0.24
0.4247
40
0.31
0.05616
2
0.0016
0.0028
0.003
0.005400
200
2000
195
0.24
0.4719
40
0.031
0.06240
2
0.0016
0.0031
0.003
0.006000
225
2250
195
0.24
0.5309
40
0.31
0.07020
2
0.0016
0.0035
0.003
0.006750
250
2500
195
0.24
0.5899
40
0.031
0.07800
2
0.0016
0.0039
0.003
0.007500
275
2750
195
0.24
0.6489
40
0.031
0.08580
2
0.0016
0.0043
0.003
0.008250
300
3000
195
0.24
0.7079
40
0.31
0.09360
2
0.0016
0.0047
0.003
0.009000
325
3250
195
0.24
0.7668
40
0.031
0.10140
2
0.0016
0.0051
0.003
0.009750
350
3500
195
0.24
0.8258
40
0.31
0.10920
2
0.0016
0.0055
0.003
0.010500
375
3750
195
0.24
0.8848
40
0.031
0.11700
2
0.0016
0.0059
0.003
0.011250
400
4000
195
0.24
0.9438
40
0.31
0.12480
2
0.0016
0.0062
0.003
0.012000
425
4250
195
0.24
1.0028
40
0.031
0.13260
2
0.0016
0.0066
0.003
0.012750
450
4500
195
0.24
1.0618
40
0.31
0.14040
2
0.0016
0.0070
0.003
0.013500
475
4750
195
0.24
1.1208
40
0.031
0.14820
2
0.0016
0.0074
0.003
0.014250
500
5000
195
0.24
1.1798
40
0.31
0.15600
2
0.0016
0.0078
0.003
0.015000
550
5500
195
0.24
1.2977
40
0.031
0.17160
2
0.0016
0.0086
0.003
0.016500
600
6000
195
0.24
1.4157
40
0.31
0.18720
2
0.0016
0.0094
0.003
0.018000
650
6500
195
0.24
1.5337
40
0.031
0.20280
2
0.0016
0.0101
0.003
0.019500
700
7000
195
0.24
1.6517
40
0.31
0.21840
2
0.0016
0.0109
0.003
0.021000
750
7500
195
0.24
1.7696
40
0.031
0.23400
2
0.0016
0.0117
0.003
0.022500
840
8400
195
0.24
1.9820
40
0.31
0.26208
2
0.0016
0.0131
0.003
0.025200
940
9400
195
0.24
2.2179
40
0.031
0.29328
2
0.0016
0.0147
0.003
0.028200
1050
10500
195
0.24
2.4775
40
0.31
0.32760
2
0.0016
0.0164
0.003
0.031500
1150
11500
195
0.24
2.7134
40
0.031
0.35880
2
0.0016
0.0179
0.003
0.034500
1250
12500
195
0.24
2.9494
40
0.31
0.39000
2
0.0016
0.0195
0.003
0.037500

Note: * Emissions stated in lb./hr. assume firing at rated capacity, continuously (i.e. worst case).

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