Rheem Rtgh-s Sr Tankless Water Heaters Instruction Manual (+ PDF)

The new degree of comfort
Water
INTEGRATED HOME COMFORT Residential Gas
RTGH-S/SR Tankless Water HeatersRTGH-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)

Contents hide

1 Specifications

2 Documents / Resources

2.1 References

3 Related Posts

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 Bathrooms1
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

Model Number	35° 45°	50°	60°	67°	70°	80°	90°	100°
RTGH-S84i/SR84i Water Flow (GPM)	8.4 6.9	6.2	5.2	4.6	4.4	3.9	3.4	3.1
RTGH-S10i/SR10i Water Flow (GPM)	10.1 7.9	7.1	5.9	5.3	5.1	4.4	3.9	3.5
RTGH-S11i/SR11i Water Flow (GPM)	11.2 8.8	7.9	6.6	5.9	5.6	4.9	4.4	3.9


Dimensions	TOP VIEW	BOTTOM VIEW

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