How does very cold intake water affect performance?

My input water temps change with the seasons, this water heater controls the amout of heat being produced at the burner, to maintain output water temp. at set levels. I set my water temp to 115F and regardles of input water temp. it stays at the set output.

Will you please list EVERYTHING you will need to install this unit?

In addition to the Rinnai unit you will need a termination vent kit and a isolation valve kit. (The isolation valve kit is included with all models NOT beginning with "V".) MyPlumbingStuff

Is this unit sufficient for Tennessee climate? I've read somewhere that it was for warmer climate areas (Florida/Texas)

Hi S. French. I live in New England which is mixed climates: Hot/Humid summers and in winter dry/colder climates. It's an indoor unit, which is in my basement, so I'm not sure how sensitive the climate is related to operation of the unit. If it were outside I would think it would be of more concern.

Does this unit come with controller? rinnai tech said i needed a mc-91-2us controller? do i need to buy separate?

I bought model V65EN. It came with a wired digital controller. The installer did not run the wire into the house and mount the controller indoors. He simply set the controller at 120 degrees and left the controller inside the unit. If I want to change the temp, I have to take the cover of the unit.

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Description

🔥 Power your home with endless hot water—efficiency meets reliability!

ENDLESS HOT WATER FLOW - Enjoy uninterrupted hot water for up to 5 appliances simultaneously—never run out during peak moments.
ENERGY SMART EFFICIENCY - High 0.82 energy factor means you pay less while staying eco-conscious—heat only when you need it.
SPACE SAVING WALL MOUNT - Compact 30"W x 13"H design fits seamlessly indoors, freeing up valuable space in your modern home.
BUILT IN LEAK PROTECTION - Advanced leak detection automatically shuts off water to prevent costly damage—peace of mind included.
TRUSTED DURABILITY WARRANTY - Backed by a 10-year heat exchanger warranty, ensuring long-term reliability for your busy lifestyle.

The Rinnai V75IN is a natural gas tankless water heater delivering up to 7.5 gallons per minute of continuous hot water. Designed for indoor wall mounting, it features a high energy factor of 0.82, built-in leak detection with automatic shutoff, and a temperature range of 98ºF to 140ºF. Ideal for serving multiple appliances simultaneously, it comes with a robust 10-year heat exchanger warranty, combining efficiency, safety, and durability in a compact footprint.

Specifications

Brand	Rinnai
Product Dimensions	30"W x 13"H
Special Feature	Energy Factor of .82 for both gas types, Leak detection shuts off water to unit to limit property damage, Temperature range with controllers: 98ºF - 140ºF
Color	White
Voltage	120 Volts
Maximum Flow Rate	7.5 Gallons Per Minute
Efficiency	High (Energy Factor of 0.82)
Style	Natural Gas, Indoor Installation
Mounting Type	Wall
Is Electric	No
Manufacturer	Rinnai
Item Depth	30 inches
UPC	766156007057
Global Trade Identification Number	00766156007057
Part Number	V75IN
Item Weight	45.6 pounds
Item model number	V75IN
Is Discontinued By Manufacturer	No
Size	7.5 GPM
Pattern	Heater
Item Package Quantity	1
Special Features	Energy Factor of .82 for both gas types, Leak detection shuts off water to unit to limit property damage, Temperature range with controllers: 98ºF - 140ºF
Included Components	Water Heater
Batteries Included?	No
Batteries Required?	No
Warranty Description	See Manufacturer

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