Specification Sheet EN
PRINTED IN U.S.A. 06/17 WP FORM NO. TK-601RH
2
Rheem Water Heating • 1115 Northmeadow Parkway, Suite 100
Roswell, Georgia 30076 • www.rheem.com 
Rheem Canada Ltd./Ltée • 125 Edgeware Road, Unit 1 
Brampton, Ontario L6Y 0P5 • www.rheem.com
INTEGRATED HOME COMFOR
T
INTEGRATED HOME COMFORT
    Water 
INTEGRATED HOME COMFORT
Commercial Gas
Tankless Water Heaters
 In keeping with its policy of continuous progress and product improvement, Rheem reserves the right to make changes without notice.
18 
1
/2”
9 
3
/4”
27 
1
/2”
2 
1
/
2
”2 
3
/
4
”
3 
1
/4”
4 
1
/4”
7 
1
/2”
6 
3
/4”
3 
1
/2”
2 
3
/4”
Indoor 
Direct 
Vent
27 
1
/2”
18 
1
/2”
9 
3
/4”
5
1
/2
”6
1
/4”
2 
1
/2”
3 
1
/4”
4 
1
/4”
7 
1
/2”
6 
3
/4”
3 
1
/2”
2 
3
/4”
2 
3
/4”
Outdoor
Maximum Single Unit Vent Length (intake/outlet):
(ULC-S636 pipe must be used for Canada.)
Tankless Multi-Unit Flow Rates
Manifold 
QTY
Total System BTU 
based on 
199,900 Btu per Unit
Total System Gallons Per Minute (GPM) - Per Temperature Rise (∆T)
35 45 50 60 70 77 80 90 100 110 120 140
1  199,900  9.5 8.4 7.5 6.3 5.4 4.9 4.7 4.2 3.8 3.4 3.1 2.7
2  399,800  19.0 16.7 15.0 12.5 10.7 9.8 9.4 8.4 7.5 6.8 6.3 5.4
3  599,700  28.5 25.1 22.5 18.8 16.1 14.6 14.1 12.5 11.3 10.2 9.4 8.1
4  799,600  38.0 33.4 30.1 25.1 21.5 19.5 18.8 16.7 15.0 13.7 12.5 10.7
5  999,500  47.5 41.8 37.6 31.3 26.8 24.4 23.5 20.9 18.8 17.1 15.7 13.4
6  1,199,400  57.0 50.1 45.1 37.6 32.2 29.3 28.2 25.1 22.5 20.5 18.8 16.1
7  1,399,300  66.5 58.5 52.6 43.8 37.6 34.2 32.9 29.2 26.3 23.9 21.9 18.8
8  1,599,200  76.0 66.8 60.1 50.1 42.9 39.0 37.6 33.4 30.1 27.3 25.1 21.5
9  1,799,100  85.5 75.2 67.6 56.4 48.3 43.9 42.3 37.6 33.8 30.7 28.2 24.2
10  1,999,000  95.0 83.5 75.2 62.6 53.7 48.8 47.0 41.8 37.6 34.2 31.3 26.8
11  2,198,900  104.5 91.9 82.7 68.9 59.1 53.7 51.7 45.9 41.3 37.6 34.4 29.5
12  2,398,800  114.0 100.2 90.2 75.2 64.4 58.6 56.4 50.1 45.1 41.0 37.6 32.2
13  2,598,700  123.5 108.6 97.7 81.4 69.8 63.4 61.1 54.3 48.9 44.4 40.7 34.9
14  2,798,600  133.0 116.9 105.2 87.7 75.2 68.3 65.8 58.5 52.6 47.8 43.8 37.6
15  2,998,500  142.5 125.3 112.7 94.0 80.5 73.2 70.5 62.6 56.4 51.2 47.0 40.3
16  3,198,400  152.0 133.6 120.3 100.2 85.9 78.1 75.2 66.8 60.1 54.7 50.1 42.9
17  3,398,300  161.5 142.0 127.8 106.5 91.3 83.0 79.9 71.0 63.9 58.1 53.2 45.6
18  3,598,200  171.0 150.3 135.3 112.7 96.6 87.9 84.6 75.2 67.6 61.5 56.4 48.3
19  3,798,100  180.5 158.7 142.8 119.0 102.0 92.7 89.3 79.3 71.4 64.9 59.5 51.0
20  3,998,000  190.0 167.0 150.3 125.3 107.4 97.6 94.0 83.5 75.2 68.3 62.6 53.7
Rheem Model Number
RTGH-C95DVLN / 
RTGH-CM95DVLN
RTGH-C95DVLP /
RTGH-CM95DVLP
RTGH-C95XLN /
RTGH-CM95XLN
RTGH-C95XLP /
RTGH-CM95XLP
Safety Devices
 Clearances Combustible and 
Noncombustable
*24 inches (610mm) reccomended for service
 – Top of Heater 12" (30cm)
 – Front of Heater 12" (30cm)
 – Sides of Heater 0.5" (1.3cm)
 – Back of Heater 0"
 – Bottom of Heater 12" (30cm)
 – From Vent Pipe 0"
Min/Max Gas Supply Pressure
4" wc (1.0kPa) / 10.5" wc 
(2.6kPa)
8" wc (2.0kPa) / 13" wc 
(3.2kPa)
4" wc (1.0kPa) / 10.5" wc 
(2.6kPa)
8" wc (2.0kPa) / 13" wc 
(3.2kPa)
Min/Max Water Supply Pressure 14 psi (97kPa) / 150 psi (1035kPa)
NOx Complies with South Coast Air Quality Management District 14 ng/J or 20 ppm NOx emission levels
Venting
Centrotherm PPs (polypropelene solid) N/A
PVC (Schedule 40, ASTM D-1785) N/A
CPVC (Schedule 40, ASTM) N/A
ABS (Schedule 40, ASTM D-2661) N/A
Common Venting
Centrotherm PPs
(polypropelene solid)
N/A N/A
Power Venting (Room Air Intake) Individual or Common Vent Individual N/A
Warranty 5 Year Heat Exchanger / 5 Year Parts / 1 Year Labor
Rheem Commercial Condensing Tankless Water Heaters Continued
Maximum Common Vent Length
MAXIMUM VENT LENGTH (EQ. FT.)
Number 
of Units
Direct Vent Power Vent (Room Air)
Air Intake Exhaust Air Intake Exhaust
2 100 100
N/A
100
3 100 100 100
4 100 100 100
5 100 100 100
6 82 82 82
7 55 55 55
8 43 43 43
To Determine Equivalent Vent Lengths, Add:
8" Common Vent
87 Degree Elbow 5.0' (1.5m)
45 Degree Elbow 2.5' (0.8m)
• The vent termination does not count as part of the 
straight pipe equivalent when determining the total 
vent length.
• The system may be vented horizontally through a 
wall or vertically through the roof.
• Header kits have already been counted and do not 
need to be added.
NUMBER 
OF 90° 
ELBOWS
MAX. LENGTH 
OF 2" 
STRAIGHT PIPE
MAX. LENGTH 
OF 3" 
STRAIGHT PIPE
MAX. LENGTH 
OF 4"
STRAIGHT PIPE
0 or 1 5.0 ft. (1.5 m) 38.0 ft. (11.6 m)  94.0 ft. (28.6 m)
2 3.5 ft. (1.0 m) 36.5 ft. (11.1 m) 88.0 ft. (26.8 m)
3 2.0 ft. (0.6 m) 35.0 ft. (10.6 m) 82.0 ft. (25.0 m)
4 N/A 33.5 ft. (10.2 m) 76.0 ft. (23.2 m)
5 N/A 32.0 ft. (9.8 m) 70.0 ft. (21.3 m)
6 N/A 30.5 ft. (9.3 m) 64.0 ft. (19.5 m)



