Rheem RTGH-68DVLN-3 Residential Gas Tankless Water Heaters User Guide
- June 1, 2024
- Rheem
Table of Contents
Rheem RTGH-68DVLN-3 Residential Gas Tankless Water Heaters
Specifications
- Rheem Model Numbers: RTGH-68DVLN-3, RTGH-84DVLN-3, RTGH-90DVLN-3, RTGH-95DVLN-3, RTGH-95DVELN-3
- Gas Input Rate: Varies from 120,000 BTU/h to 199,900 BTU/h
- Uniform Energy Factor (UEF): Ranges from 0.90 to 9.5
- Flow Rate: Ranges from 5.1 to 8.5 Gallons Per Minute
- Minimum Activation Flow: 0.4 GPM
- Maximum Altitude: 7,800 ft.
- Warranty: 15-year Heat Exchanger, 5-Year Parts, 1-Year Labor
- Dimensions: Height: 23.7 inches, Width: 17.7 inches, Depth: 9.8 inches
- Venting Materials: Sched. 40 PVC, CPVC, Polypropylene
Product Usage Instructions
Installation
The RTGH Series Tankless Water Heaters are designed for easy installation
and are suitable for retrofits in residential settings.
Temperature Settings
The water heater comes with factory-set temperature settings. A high-
temperature upgrade is available if needed.
Flow Rate Capacity
Refer to the Flow Rate Capacity Table by Zone to determine the appropriate
flow rate for your specific model.
Venting Guidelines
Follow the venting guidelines provided in the manual based on the number of
90-degree elbows used.
Maintenance and Service
Ensure a clearance of at least 24 inches for servicing the unit as
recommended.
Rheem® RTGH Series Super High-Efficiency Condensing Tankless Gas Water Heaters
Specifications
Rheem Model Number| RTGH-68DVLN-3| RTGH-84DVLN-3|
RTGH-90DVLN-3| RTGH-95DVLN-3 RTGH-95DVELN-3
---|---|---|---|---
Built-in LeakGuard ™ **Model Number| | RTGH-95DVELN-3**
(Wi-Fi Model)
Gas Input Rate| MAX| 120,000 BTU/h| 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| 11,000 BTU/h
Uniform Energy Factor (UEF)| 0.90| 0.93
Hot Water Flow Rate Capacity – Gallons Per Minute (GPM)| MAX (35°F)|
6.6| 8.4| 9.0| 9.5
45°F Rise| 5.1| 6.7| 7.7| 8.5
67°F Rise| 3.4| 4.6| 5.2| 5.7
Number of Bathrooms 1| 2.5| 3| 3 – 4| 4
Temp. Range| 100°F – 140°F
Temp. Setting from Factory| 120°F
High Temp. Upgrade Available| No
Freeze Protection| -30°F Air Intake2, -4°F Ambient
Installation Type| Indoor (Outdoor Conversion Kit sold separately:
RTGH-X)
Heat Exchanger Material| Primary: Copper – Secondary: Stainless
Steel
Minimum Activation Flow| 0.4 GPM
Minimum Continuous Flow| 0.26 GPM
Maximum Altitude| 7,800 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
Height| 23.7″
Width| 17.7″
Depth| 9.8″
Weight (Lbs.)| 52.9
Venting Diam. Allowed| 2″ / 3″
Max. Single Vent Run (straight pipe)| 60 ft (2″) / 150 ft (3″)
Venting Materials| Sched. 40 PVC, CPVC, Polypropylene
Manifold Controls (max. units)| 6 Units3
Controls| Built-in digital display
Power Supply| 120V 60Hz
Max. Power Consumption| 85W (Normal use), 0.7 Amps 132W (Antifreeze),
1.1 Amps 3.5W (Standby), 0.03 Amps4
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)
All models are available in Natural Gas or Propane (LP). For Propane replace the N with P for LP model.
RTGH Series Models
- Indoor Models
- (Outdoor Conversion Kit
- Available : RTGH-X)
- 11,000-199,900 BTU/h Natural Gas and
- Liquid Propane Models
Swap P for N in the model number for the Liquid Propane model
Clearances
| Top / Bottom | 12″ |
|---|---|
| Front | 1/2″5 |
| Sides | 1/2″ |
| Back / From Vent Pipe | 0″ |
Based on simultaneous showers using a 2.0 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 the 9-zone ground water temperature map for accurate sizing. 2 For indoor application, this is the temperature of outdoor intake air. 3 Manifolds with standard RJ11 communication cables. 4 If anti-freeze is on and combustion is on, total W will be 217W (85+132). 5 Recommended 24″ clearance for service.
US Ground Water Temperature Zone Map
Average Flow Rates (GPM) by Application
| Low Flow Faucet | 0.5 |
|---|---|
| Bathroom Faucet | 1 |
| Kitchen Faucet | 1.5 |
| Shower | 2 |
| Dishwasher | 2 |
| Washing Machine | 3 |
Flow Rate Capacity Table by Zone (Gallons Per Minute – GPM)
Use the U.S. Ground Water Temperature Map to locate your zone. Then use the
Flow Rate Capacity Table to determine the model flow rate by zone. Flow rates
were calculated for the tankless set temperature of 120°F with a mixed shower
temperature of 105°F. Groundwater temperatures vary seasonally.
Venting
SINGLE UNIT: MAX. EQUIVALENT VENT LENGTHS – STRAIGHT PIPE
Number of 90 Elbows| Max Length 2″ straight pipe|
Max. length 3″ straight pipe
0| 60 ft. (18.3 m)| 150 ft. (45.7 m)
1| 54 ft. (16.5 m)| 144 ft. (43.9 m)
2| 48 ft. (14.6 m)| 138 ft. (42.7 m)
3| 42 ft. (12.8 m)| 132 ft. (40.2 m)
4| 36 ft. (11.0 m)| 126 ft. (38.4 m)
5| 30 ft. (9.1 m)| 120 ft. (36.6 m)
6| 24 ft. (7.3 m)| 114 ft. (34.7 m)
Min. Vent Length Straight Pipe
Number of 90° Elbows| Min. Length 2″
3″ pipe
1| 1.0 ft (0.3 m)
Equivalent Ft. of Elbows
| 2″ Pipe| 3″ Pipe
90° Elbow| 6 ft (1.83 m)| 6 ft (1.83 m)
45° Elbow| 3 ft. (0.9 m)| 3 ft. (0.9 m)
Venting Materials Allowed: Schedule 40 PVC, CPVC, Polypropylene
Hanging brackets and bird screens are included with the water heater.
Parts & Accessories
In keeping with its policy of continuous progress and product improvement, Rheem reserves the right to make changes without notice.
Dimensions
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
10/23 FORM NO. TK-RTGH SERIES REV. 1
FAQs
- Q: Can I use this water heater with propane instead of natural gas?
- A: Yes, all models are available in Natural Gas or Propane. Simply replace the N with P in the model number for the LP model.
- Q: What is the warranty coverage for this product?
- A: The product comes with a 15-year warranty on the heat exchanger, a 5-year warranty on parts, and a 1-year labor warranty.
- Q: What is the minimum activation flow rate required for this water heater?
- A: The minimum activation flow rate is 0.4 gallons per minute (GPM).