RUUD RUTGH-S SR Tankless Water Heaters User Manual
- June 13, 2024
- RUUD
Table of Contents
RUTGH-S/SR Models
Indoor Models
(Outdoor Conversion Kit
Available: RTGH-SX)
11,000-199,900 BTU/h
Natural Gas/LP Convertible
RUTGH-S SR Tankless Water Heaters
Clearances
Top / Bottom| 12″
Front| 1/2″6
Sides| 1/2″
Back / From Vent Pipe| 0″
Recirculation Length (SR Models)
Pipe Diameter| Max. Recirculation Loop
3/4″| 400 ft.
1/2″| 100 ft.
- Based on simultaneous showers using 2.5 GPM flow rate pre-mixed with cold water line. Flow rates vary depending on temperature of incoming cold water and water heater set temperature. Refer to flow rate curves for accurate sizing.
- For indoor application, this is the temperature of outdoor intake air.
- External check valve required for installation.
- Manifolds with standard RJ25 communication cables.
- If anti freeze is on and combustion is on, total W will be 217W (85+132).
- Recommended 24″ clearance for service.
Ruud® S/SR Series Super High Efficiency Condensing Tankless Gas Water
Heater
Easy Installation
- PVC Vent runs up to 70′ (2″), 150′ (3″)
- Easy set up with 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
- Ruud® Exclusive! Hot-start programming™ ensures the unit is in a ready state between back-to-back usage, avoiding any cold water bursts
- Built-in Recirculation pump for no wait continuous hot water at the tap (SR models)
- Built-in Wi-Fi with EcoNet® capability for direct control from your device (optional for S models)
Specifications
Ruud Model Number| RUTGH-S84i RUTGH-SR84i| RUTGH-S10i RUTGH-
SR10i| RUTGH-S11i RUTGH-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| Meets 14 ng/J NOx requirements – SCAQMD Rule 1146.2
compliant
Warranty| 15 Year Heat Exchanger | 5-Year Parts | 1-Year Labor
Model Number| RUTGH-S| RUTGH-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, Polyproyplene
Common Venting (max. units)| 2 units3
Flex Venting| Allowed: 2″ up to 50′
Manifold Controls (max. units)| Up to 20 units without external control
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 (Anti freeze), 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)
Water Heater Flow Rate Curves
Temperature Rise (°F)
| Model Number | 35° 45° | 50° | 60° | 67° | 70° | 80° | 90° 100° |
|---|---|---|---|---|---|---|---|
| RUTGH-S84i/SR84i Water Flow (GPM) | 8.4 6.9 | 6.2 | 5.2 | 4.6 | 4.4 | 3.9 | 3.4 |
| RUTGH-S10i/SR10i Water Flow (GPM) | 10.1 7.9 | 7.1 | 5.9 | 5.3 | 5.1 | 4.4 | 3.9 |
| RUTGH-S11i/SR11i Water Flow (GPM) | 11.2 8.8 | 7.9 | 6.6 | 5.9 | 5.6 | 4.9 | 4.4 |
Above estimates are for sizing purposes only.
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, Polyproyplene
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.
Hanging bracket, bird screens, LP gas conversion kit are included with water heater.
Parts & Accessories
Condensate Neutralizer| Non-Return Valve| ****
Flex Vent Kit
| ****
Pipe Cover
| Horizontal Vent Termination| Concentric Vent Termination|
AllClear ® Water Treatment System| Isolation Valve
Kit| Manifold Cables| Outdoor Conversion Kit| Crossover
Valve
---|---|---|---|---|---|---|---|---|---|---
SP12151 (optional)
| SP21088
| SP21091
| RTG20322
| 2″ US: SP21069G 3″ US: SP21069E
| 2″ – SP20897 3″ – SP20245
| RTG20251
| RTG20326
| RCPN-AMP03- 0013111101-0003 (48″)
| RTGH-SX
| RTG20285
In keeping with its policy of continuous progress and product improvement,
Ruud reserves the right to make changes without notice.
Ruud Water Heating • 1115 Northmeadow Parkway, Suite 100, Roswell, Georgia
30076 • www.ruud.com
04/23 FORM NO. TKR-RUTGHS Rev. 2