Rinnai RL75iN Indoor Natural Gas Tankless Water Heater

Stop planning your evenings and mornings around your water heater. Now, you can set your own schedule, all thanks to the RL75iN. Ideal for 2 to 3-bathroom homes, the RL75iN delivers up to 7.5 GPM (gallons per minute) of hot water, while saving energy and money. Mount your compact RL75iN in practically any room, and directly vent to the outside with a just single penetration through a wall or roof.

Features

• ENERGY STAR Qualified
• Certified for installation in mobile homes
• Propane and natural gas models available
• Compatible with a full range of Rinnai digital controllers
• Enhanced scale detection lessens the possibility of serious, long-term damage
• Temperature lock function prevents unauthorized or accidental changes to water temperature
• Complies with South Coast Air Quality Management District 14 ng/J or 20 ppm NOx emission levels

Warranty

Click here for more information about the warranty.

Temperature rise (or delta T) in ºF at various flow rates

Feature Table

Model*	Capacity	Input BTUs in thousands		Hot Water Capacity in gallons per minute (GPM)			Energy Factor	Energy Use		Temperature Settings
								Normal, Standby, Anti-Frost
		Min	Max	Activation	Min	Max		Indoor model	Outdoor model	Residential	Commercial**
Value Series - Value and comfort for small to medium homes
V53eN V53eP		19 (N) 20.2 (P)	120	0.6	0.6	5.3	0.82	55 Watts, 2 Watts, 184 Watts	33 Watts, 2 Watts, 74 watts	120°F - 140°F	Residential only
V65iN V65iP V65eN V65eP		10.3	150	0.4	0.26	6.6	0.82	76 Watts, 2 Watts, 120 Watts	57 Watts, 2 Watts, 104 Watts	98°F - 140°F	98°F - 160°F (indoor) 98°F - 185°F (outdoor)
V75iN V75iP V75eN V75eP		10.3	180	0.4	0.26	7.5	0.82	76 Watts, 2 Watts, 120 Watts	57 Watts, 2 Watts, 104 Watts	98°F - 140°F	98°F - 160°F
Luxury Series - High output for larger homes
RL75iN RL75iP RL75eN RL75eP		10.3	180	0.4	0.26	7.5	0.82	76 Watts, 2 Watts, 104 Watts	57 Watts, 2 Watts, 104 Watts	98°F - 140°F	98°F - 160°F
RL94iN RL94iP RL94eN RL94eP		10.3	199	0.4	0.26	9.8	0.82	97 Watts, 2 Watts, 184 Watts	65 Watts, 2 Watts, 104 Watts	98°F - 140°F	98°F - 185°F
Ultra Series - Ultimate efficiency, largest capacity
RU80iN RU80iP RU80eN RU80eP		15.2	152	0.4	0.26	8	0.96	42 Watts, 2 Watts, 146 Watts	41 Watts, 2 Watts, 168 Watts	98°F - 140°F	98°F - 185°F
RU98iN RU98iP RU98eN RU98eP		15.2	199	0.4	0.26	9.8	0.95	64 Watts, 2 Watts, 146 Watts	63 Watts, 2 Watts, 168 Watts	98°F - 140°F	98°F - 185°F

* e = Exterior/Outdoor; i = Interior/Indoor; N = Natural Gas; P = Liquid Propane
** Commercial controller must be purchased separately

Technical Specifications:

→Type of Appliance:Temperature controlled, continuous flow, gas hot water system, installation in manufactured (mobile) homes, Forced combustion/Direct Vent, Energy Star qualified.
→Rinnai Model Number: REU-VC2528FFUD-US
→Minimum/Maximum Gas Rate (Input): 10,300 - 180,000 BTU/h
→Electrical: Appliance: AC 120 Volts - 60 Hz, Controller: DC 12 Volts
→Electrical Consumption: Normal: 76 w Standby: 2 w Anti-frost protection: 120 w
→Ignition System: Direct electronic ignition
→Hot Water Capacity: Minimum flow rate: 0.26 GPM, Minimum activation flow rate: 0.4 GPM, Maximum flow rate: 7.5 GPM
→Temperature: 98° - 120° F (factory default) Maximum temperature is selectable at 120° F or at 140° F; 98° - 160° F available with the MCC-91-2 controller for hydronic applications
→Temperature (without remote): 120° F (factory default) or 140° F
→Installation: Indoor only
→Energy Factor: Natural Gas: 0.82 Propane: 0.82
→Service Connections: Gas supply: 3/4 inch MNPT Cold water inlet: 3/4 inch MNPT, Hot water outlet: 3/4 inch MNPT
→Isolation & Pressure Relief Valves Included: Heavy duty forged brass Webstone Isolator valves EXP E2, certified to NSF/ANSI 61-8 for potable water
→Water Flow Control: Water flow sensor, electronic water control device and fixed by-pass
→Minimum/Maximum Water Supply Pressure: 20 - 150 PSI (recommended 30-80 PSI for maximum performance)
→Water Temperature Control: Simulation feed forward and feedback
→Controller: MC-91-2US (included), Deluxe controller: MC-100V-1US (optional), Bathroom controller: BC-100V-1US (optional), MCC-91-2US (optional; for hyrdonic applications)
→Controller Cable: Non-polarized two-core cable, minimum 22 AWG
→Safety Devices: Flame failure - Flame Rod, Boiling protection, Combustion fan rpm check, Over current - glass fuse, Remaining flame (OHS), Thermal fuse, Automatic frost protection.
→Clearances from Combustibles, (suitable for closet, attic, and crawl space installations): Top of heater - 6 inches, Front (Panel) - 6 inches, Sides of heater - 2 inches, Back of heater - 0 inches, Ground / bottom - 12 inches, Front vent pipe - 0 inches
→Clearances from Non-combustibles: Top of heater - 2 inches, Front (Panel) - 6 inches, Sides of heater - 1/2 inches, Back of heater - 0 inches, Ground/bottom - 12 inches, From vent pipe - 0 inches
→Min. / Max. Gas Supply Pressure (sea level): Natural Gas: min 5” W.C. max 10.5” W.C., Propane Gas: min 8” W.C. max 13.5” W.C.
→Manifold Gas Pressure (inches W.C.): Natural Gas: high fire 2.5” W.C. low fire 0.61” W.C., Propane Gas: high fire 3.9” W.C. low fire 0.87” W.C
→Front cover material: Powder coated galvanized steel

Dimensions

Measurement in inches (millimeters)

How to Vent this Tankless Hot Water Heater

Here is what you need to vent this tankless heater to the roof.

You only need to buy one of the appropriate length items from among the selection in Group A and Group B below. Consider any optional roofing accessories from Group C below.

Group A

Are you in a cold climate with possibly significant snow accumulation? If so, buy our Rinnai/Ubbink Roof Discharge Termination 38" (Cold Climate), pn 184119. If not, buy our Rinnai/Ubbink Roof Discharge Termination 18", pn 184118-S.

Group B

Choose the additional pipe length you need from the top of the Rinnai heater to the pipe in Group A.

• Rinnai/Ubbink 2" to 12" Telescoping Vent Pipe Extension, pn 224054
• Rinnai/Ubbink 10" Vent Pipe Extension, pn 224051
• Rinnai/Ubbink 19.5" Vent Pipe Extension, pn 224052
• Rinnai/Ubbink 39" Vent Pipe Extension, pn 224053

Group C

• Rinnai/Ubbink Roof Flashing, Roof Pitch 1/12 to 6/12, pn 189950
• Rinnai/Ubbink Roof Flashing, Roof Pitch 6/12 to 12/12, pn 189951
• Rinnai/Ubbink Roof Flashing, Roof Pitch 8/12 to 16/12, pn 189952
• Rinnai/Ubbink Flat Roof Flashing, pn 146141
• Rinnai/Ubbink Metal Roof Flashing, pn 242141

Here is what you need to vent this tankless heater sideways to the wall.

You only need to buy one of the appropriate length items from among the selection in Group A and Group B below. Consider any optional accessories from Group C below.

Group A

Are you in a cold climate and expect a lot of condensate flowing through this termination pipe? If so, buy one of these two lengths:

• Rinnai/Ubbink 12" All Weather Wall Termination Kit, pn STDKITVA-A
• Rinnai/Ubbink 21" All Weather Wall Termination Kit, pn STDKITVA-A21

If not, buy one of these two lengths:

• Rinnai/Ubbink 11.5" Universal Non-Condensing Wall Termination Kit, pn 223181
• Rinnai/Ubbink 21" Universal Non-Condensing Wall Termination Kit, pn 223182

Group B

Choose the additional pipe length you need to extend the distance, between the elbow part and the termination part in the kit above, to the wall.

• Rinnai/Ubbink 2" to 12" Telescoping Vent Pipe Extension, pn 224054
• Rinnai/Ubbink 10" Vent Pipe Extension, pn 224051
• Rinnai/Ubbink 19.5" Vent Pipe Extension, pn 224052
• Rinnai/Ubbink 39" Vent Pipe Extension, pn 224053

Group C

• Rinnai/Ubbink Wall Thimble, fits 2x4 or 2x6 wall construction, pn 224045
• Rinnai/Ubbink Metal Pass Through Plate, pn 224097

Installation Help and Recommendations

We recommend that you have a professional Tankless Water heater installer review the above recommendations. Need an installer? Get 4 FREE Tankless Water Heater Installation Estimates Now. It's Quick and Easy!
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Documents

• Installation and Operation Manual
• Detailed Specifications: RL75i
• Energy Guide: RL75i_VC-2528FFUD-US
• Hot Water Design Manual

Frequently Asked Question

Q1: Can this heater be used with 1/2" pipe?
A1: The normal connection for both gas and water supply is 3/4" MNPT. For gas, you can use other pipe sizes as long as you maintain between 8 and 13.5" of water column. For water, you can use other pipe sizes; but since that will affect your flow rate, your output water temperature will be different from the calculations shown with 3/4" MNPT.

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