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

🔥 Smart Heat, Endless Comfort — Stay Ahead with Rinnai!

SAFETY MEETS INNOVATION - Advanced leak detection and temperature lock features protect your home and family, combining smart tech with essential safety.
ECO FRIENDLY EFFICIENT - Low NOx emissions and an impressive energy factor of 0.82 reduce your carbon footprint while saving on utility bills.
ENDLESS HOT WATER ON DEMAND - Experience up to 7.5 gallons per minute of continuous, energy-efficient hot water flow—never run out during your busiest mornings.
BUILT TO LAST BACKED TO TRUST - Industry-leading 10-year heat exchanger warranty ensures peace of mind and long-term reliability for your home.
SMART CONTROL AT YOUR FINGERTIPS - Use the Control-R 2.0 mobile app to schedule, monitor, and even set vacation mode remotely—perfect for the tech-savvy professional.

The Rinnai V75IN is a high-efficiency, natural gas tankless water heater designed for indoor installation. Delivering up to 7.5 gallons per minute, it features smart Control-R 2.0 app integration for remote scheduling and vacation mode. With a robust 10-year heat exchanger warranty, low NOx emissions, and advanced safety features like leak detection and temperature lock, it offers reliable, eco-conscious hot water on demand for modern homes.

Specifications

Manufacturer	Rinnai
Part number	V75IN
Item Weight	20.7 Kilograms
Product Dimensions	76.2 x 76.2 x 33.02 cm; 20.68 kg
Item model number	V75IN
Size	7.5 GPM
Color	Indoor Installation
Style	Natural Gas
Pattern	Heater
Power source type	Natural Gas
Voltage	120 Volts
Item Package Quantity	1
Flow Rate	7.5 Gallons Per Minute
Maximum Pressure	8 Bars
Plug Profile	Wall
Special Features	Energy Factor of .82 for both gas types, Enhanced scale detection lessens possibility of serious, long-term damage to unit, Leak detection shuts off water to unit to limit property damage, Temperature Lock, Temperature range with controllers: 98ºF - 140ºF
Included components	Water Heater
Batteries Included?	No
Batteries Required?	No

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