RUUD RUTGH-S84i Tankless Water Heaters Owner’s Manual
- June 13, 2024
- RUUD
Table of Contents
RUUD RUTGH-S84i Tankless Water Heaters
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 for 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| RUTH-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, 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
required
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 the unit)
RUTGH-S/SR Models Indoor Models
- (Outdoor Conversion Kit Available: RTGH-SX) 11,000-199,900 BTU/h Natural Gas/LP Convertible
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.
1 Based on simultaneous showers using 2.5 GPM flow rate pre-mixed with cold water line. Flow rates vary depending on the temperature of incoming cold water and the water heater set temperature. Refer to flow rate curves for accurate sizing. 2 For indoor applications, this is the temperature of outdoor intake air. 3 External check valves are required for installation. 4 Manifolds with standard RJ25 communication cables. 5 If an anti freeze is on and combustion is on, total W will be 217W (85+132). 6 Recommended 24″ clearance for service.
Water Heater Flow Rate Curves
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, Polypropylene
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.
Dimensions
TOP VIEW
BOTTOM VIEW
The hanging bracket, bird screens, and LP gas conversion kit are included with the 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
| AP20473
| 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.