Rheem RTGH-S SR Tankless Water Heaters Instruction Manual

The new degree of comfort
Water
INTEGRATED HOME COMFORT Residential Gas
RTGH-S/SR Tankless Water Heaters RTGH-S/SR Models
(Non-recirculation S Models
COMING SOON!)
Indoor Models (Outdoor Conversion Kit
Available: RTGH-SX) 11,000-199,900 BTU/h
Natural Gas/LP Convertible

Rheem® IKONIC™ Super High Efficiency
Condensing Tankless Gas Water Heater

Easy Installation

• PVC Vent runs up to 70′ (2″), 150′ (3″)
• Easy set up with the full-text digital display and no dip-switches
• Field gas convertible from natural gas to LP – conversion kit included

Ready for Retrofits

• Allows flex venting through existing B-vent up to 50′
• 1/2″ Gas line compatibility (subject to local code)
• Approved for installations in Manufactured Home (Mobile Home) environments

Key Features

• Stainless steel Primary and Secondary heat exchangers provide increased efficiency and durability
• Hot-start programming™ ensures the unit is in a ready state between back-to-back usage, avoiding any cold water bursts –

Rheem® Exclusive!

• Built-in Recirculation pump for instant hot water at the tap (SR models)
• Built-in EcoNet® wifi capability for direct control from your device (optional for S models)

Specifications

COMING SOON!

Rheem Model Number| RTGH-S84i RTGH-SR84i| RTGH-S10i RTGH-SR10i| RTGH-S11i RTGH-SR11i
---|---|---|---
Gas Input Rate| MAX| 157,000 BTU/h| 180,000 BTU/h| 199,900 BTU/h
MIN| 11,000 BTU/h| 11,000 BTU/h| 11,000 BTU/h
Uniform Energy Factor (UEF)| 0.96
Gallons Per Minute (GPM)| MAX (35°F)| 8.4| 10.1| 11.2
45°F Rise| 6.9| 7.9| 8.8
67°F Rise| 4.6| 5.3| 5.9
Number of Bathrooms 1| | |
Temp. Range| 85°F – 140°F
Temp. Setting from Factory| 120°F
Installation Type| Indoor (Outdoor Conversion Kit sold separately: RTGH- SX)
Fuel Type| Compatible with Natural Gas and LP (ships NG with LP conversion kit included)
Heat Exchanger Material| Primary: Stainless Steel – Secondary: Stainless Steel
Minimum Activation Flow| 0.4 GPM
Minimum Continuous Flow| 0.26 GPM
Maximum Altitude| 10,200 ft.
Ultra Low NOx| Yes (SCAQMD compliant)
Warranty| 15-Year Heat Exchanger – (w/ registration) 12-Year Heat Exchanger – (w/o registration) 5-Year Parts | 1-Year Labor
Model Number| RTGH-S| RTGH-SR
---|---|---
Height| 28-9/16″
Width| 17-5/16″
Depth| 13-11/16″
Weight| 77.6lbs| 86lbs
Venting Diam. Allowed| 2″ / 3″
Max. Single Vent Run (straight pipe)| 70 ft (2″)/ 150 ft (3″)
Venting Materials| Sched. 40 PVC, CPVC, PP
Common Venting (max. units)| 2 units3
Flex Venting| Allowed: 2″ up to 50′
Manifold Controls (max. units)| Up to 20 units without external control are required4
Controls| Built-in digital display with full-text menus
Power Supply| 120V 60Hz
Max. Power Consumption| 85W (Normal use), 0.7Amps 132W (Anti freeze only), 1.1Amps 3.5W (Standby), 0.03Amps5| 100W (Normal use), 0.83Amps 200W (Antifreeze), 1.67Amps 3.5W (Standby), 0.03Amps5
Gas Connection| 3/4″ NPT
Hot Water Connection| 3/4″ NPT
Cold Water Connection| 3/4″ NPT
Condensate Connection| 1/2″ NPT
Vent Connections Diameter| 2″ Band Connections (Adapter required to vent with 3″ PVC from unit)
Clearances

Top / Bottom| 12″
Front| 1/2″6
Sides| 1/2″
Back / From Vent Pipe| 0″
Recirculation Length (Sri Models)

Pipe Diameter| Max. Recirculation Loop
3/4″| 400 ft.
1/2″| 100 ft.

1 Based on simultaneous showers using 2.5 GPM flow rate pre-mixed with the cold water line. Flow rates vary depending on the temperature of incoming cold water and the water heater’s set temperature. Refer to flow rate curves for accurate sizing. 2 For indoor application, this is the temperature of the outdoor intake air. 3 External check valves are required for installation. 4 Manifolds with standard RJ25 communication cables. 5 If antifreeze is on and combustion is on, total W will be 217W (85+132). 6 Recommended 24″ clearance for service.

Water Heater Flow Rate Curves

Delta T (°F)

RTGH-S10i RTGH-S84i
RTGH-S11i/SR11i
RTGH-S10i/SR10i
RTGH-S84i/SR84i

Venting

SINGLE UNIT: MAX. EQUIVALENT VENT LENGTHS – STRAIGHT PIPE

Number of 90 Elbows| Max Length 2″ straight pipe| Max. length 3″ straight pipe
0| 70 ft. (21.3 m)| 150 ft. (45.7 m)
1| 64 ft. (19.5 m)| 145 ft. (44.2 m)
2| 58 ft. (17.7 m)| 140 ft. (42.7 m)
3| 52 ft. (15.8 m)| 135 ft. (41.1 m)
4| 46 ft. (14.0 m)| 130 ft. (39.6 m)
5| 40 ft. (12.2 m)| 125 ft. (38.1 m)
6| 34 ft. (10.4 m)| 120 ft. (36.6 m)
Equivalent Ft. of Elbows

| 2″ Pipe| 3″ Pipe
90° Elbow| 6 ft (1.83 m)| 5 ft (1.52 m)
45° Elbow| 3 ft. (0.9 m)| 2.5 ft. (0.75 m)

Venting Materials Allowed: Schedule 40 PVC, CPVC, PP

Min. Vent Length Straight Pipe

Number of 90° Elbows| Min. Length 2″ 3″ pipe
1| 1.0 ft (0.3 m)
COMMON VENTING

# of Water Heaters| 3″ Common Vent
2| 60 ft.
SINGLE UNIT: Max. Flex Venting

Max Length 2″ flex vent
50 ft.

Parts & Accessories
A hanging bracket, bird screens, and LP gas conversion kit are included with the water heater.

Condensate Neutralizer| Non-Return Valve| Flex Vent Kit| Pipe Cover| Horizontal Vent Termination| Concentric Vent
Termination
---|---|---|---|---|---
SP12151 (optional)| SP21088| SP21091| AP20473| 2″ US: SP21069G
3″ US: SP21069E| 2″ – SP20897
3″ – SP20245
| | | | |
AllClear® Water Treatment
System| Isolation Valve Kit| Manifold Cables| Outdoor Conversion Kit| Crossover Valve
---|---|---|---|---
RTG20251| RTG20220AB| RCPN-AMP03- 0013111101-0003 (48″)| RTGH-SX| RTG20285
| | | |

In keeping with its policy of continuous progress and product improvement, Rheem reserves the right to make changes without notice.
Rheem Water Heating • 1115 Northmeadow Parkway, Suite 100
Roswell, Georgia 30076 • www.rheem.com

References

• Global Leader and Manufacturer of Heating, Cooling, and Water Heating Products - Rheem Manufacturing Company

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