Rinnai makes a full line of natural gas tankless water heaters for the whole home under the iN and eN model names. The iN is for indoor installation, while the eN is for outdoor installation. Rinnai makes these in a variety of sizes, and we take an in-depth look at the Rinnai V75iN and Rinnai V94iN units.

Rinnai Indoor Installation

Rinnai Outdoor Installation

Rinnai V75iN

Rinnai is a well-known and reliable brand that always manages to introduce top quality, efficient and innovative tankless water heaters. V75iN is not different. Rinnai V75iN is a powerhouse of amazing features and far superior to other models in technology domain. This heater runs on Natural gas and has a contemporary and sleek outlook that easily can be fitted to any nook and corner of your house. Unlike traditional tanked models, this heater doesn’t need electricity supply or a blizzard of pipes and tubes for operating and producing hot water. The minimum gas rate that it utilizes is 10,300BTU and maximum rate is 180,000BTU. It is an eco-friendly product that already meets the NOx emission standards of Texas and California. V75iN energy factor is 0.82, which means it is around 82% energy efficient. This heater comes with a digital remote control that is equipped with Error Code Indicator. This indicator notifies the user about any probable issues that need immediate attention and fixing.

Pros

  • Since it is gas powered you can easily save a lot of money on your utility bills
  • This model doesn’t have a water tank and the water is heated only when you demand it which makes it a feasible option if you want to save energy resources
  • Its noiselessness is an important advantage because even if you have installed it in your bedroom the heater run literally noiselessly
  • The fact that this heater produced 7.5Gallons hot water per min is highly impressive
  • Installation is fairly simple and easy which becomes even more simplistic with the very useful and helpful DIY setup guide. The guide provide detailed information about the components and tools required and relays the complete installation process in a step-by-step style

Cons

  • The unit uses less natural gas in comparison to tanked heaters but one key drawbacks is that it more natural gas than some other more efficient models
  • Just like other models of tankless water heaters, this unit also cannot supply hot water instantly and continuously and the probability of cold sandwich effect cannot be overlooked

Installation and Specifications

You can easily install it yourself using a DIY approach since the package comes with an elaborative and easy to comprehend user manual. However, we would recommend that you get professional help especially if you don’t have any prior experience with natural gas heaters. You need to use only the listed and tested exhaust/combustion air vent and not any other one. The unit utilizes outdoor air for combustion, which makes it very safe to be used for residential purposes. V75iN has direct vent sealed combustion that lets the unit to be easily installed in bedrooms, kitchens and bathrooms where conventional B-Vent water heaters cannot be fitted. However, the heater offers limited capacity as far as termination of vent is concerned and you must check installation manual to ensure the required limit.

Assembled Depth9.3″
Assembled Height23″
Assembled Width14 “
Product Depth9.3″
Product Height23″
Product Width14″
Vent diameter0″
Water Connection Size3/4″
Finish FamilyGray
Flow Rate @ 35 F Rise (gallons/min)7.5 gal (US)/min
Flow Rate @ 45 F Rise (gallons/min)7.5 gal
Fuel TypeGas
Gas Connection Size3/4″
Gas Product TypePoint of Use
Gas TypeNatural Gas/Propane Gas
Indoor/OutdoorIndoor
Maximum Temperature (F)140
Minimum Activation Rate (gpm)0.4
Minimum Temperature (F)98
Product Weight (lb.)45.6 lb
Residential/Commercial/industrial UseResidential or commercial
ModelV75iN
Total BTU180000.000
Water Connection LocationBottom
Water Heater FeaturesWall Mountable
Vent TypeSingle Wall

Common Problems

Since it is highly efficient and utilizes more gas for heating water therefore, when the unit is operating the other natural gas outlets at home tend to work less efficiently because of the huge burden V75iN imposes on gas supply. Another problem is that when you purchase this heater online, the warranty terms get affected and it becomes impossible to receive any kind of compensation or repairs from the manufacturer if you have purchased it online. However, considering the low gas consumption and smart technology that this model offers, it is a great deal for fulfilling hot water demand of a medium sized family.

Ideal Use

Overall, the Rinnai V75iN is a great way to get a constant water supply whilst saving on gas expenses, though this is a benefit of the tankless water heater system rather than this particular product. Problems with the warranty and other problems endemic to this technology make the Rinnai V75iN less appealing than it should be.

Rinnai V94iN

Rinnai V94iN offers an attractive looking and very innovative as well as technologically sound water heating solution for indoor usage. It is a space-saving, sleek, compact and energy efficient unit that offers flexible venting options, that is, both concentric and twin pipe installations. This unit weighs 80pounds, contains MC-91-2US digital controller and operates on natural gas. Efficiency wise this heater is superior to other gas powered models with 9.4GPM flow rate. For indoor use both in commercial and residential areas, this unit is ideal because it supplies endless hot water supply. It is equipped with all the necessary trappings of tankless water heaters. 

Key Features

  • Versatile venting options i.e Concentric or PVC
  •  0.96 Energy Factor
  • Compact design and space saving attribute
  • Minimal NOx emissions
  • 199,000 max BTU

Pros

  • Its 0.96 energy factor ensures that it is an economical and efficient unit
  • Low carbon dioxide emissions makes it an eco-friendly option
  • Supplies hot water without interruption to multiple taps
  • Concentric/Twin pipe PVC Venting options in a single unit makes it highly innovative and usable
  • It utilizes 199,000BTU and produces around 9.4GPM hot water and therefore this product is suitable for large families
  • 12 years heat exchanger , 5-years parts and one to five years after sales service warranty for domestic users and 5years heat exchanger, 5 years parts and 1-2 years servicing warranty for commercial users.

Cons

  • The unit is very sensitive and installation is rather intricate
  • The heater is expensive, which although is reasonable considering the high level of features that it offers, but many users cannot afford it due to the price tag
  • You will need the services of a professional and certified Rinnai repair personnel for repairing purposes if the unit breaks down

Installation and Specifications

The unit is so light weight and compact that you can easily install it anywhere and carry along whenever you need to shift its position. You can install it anywhere around the house or your commercial property and offices since the unit offers two different venting options in a condensing water heater design. Rinnai is the only brand that offers both concentric and PVC venting option in a single unit, which adds to the heater’s usability and user-friendliness. You don’t need to have an adaptor and the package includes everything that you may require for installing it.

Assembled Depth10″
Assembled Height26″
Assembled Width18.5″
Product Depth10″
Product Height26″
Product Width18.5″
Vent diameter0″
Water Connection Size1/2″
Finish FamilyGray
Flow Rate @ 35 F Rise (gallons/min)9.8 gal (US)/min
Flow Rate @ 45 F Rise (gallons/min)9.5 gal
Fuel TypeGas
Gas Connection Size3/4″
Gas Product TypePoint of Use
Gas TypeNatural Gas/Propane
Indoor/OutdoorIndoor
Maximum Temperature (F)140
Minimum Activation Rate (gpm)0.4
Minimum Temperature (F)98
Product Weight (lb.)70.5 lb
Residential/Commercial/industrial UseResidential or commercial
ModelRUC98iN
Total BTU199000.000
Water Connection LocationBottom
Water Heater FeaturesWall Mountable
Vent TypeSingle Wall

Common Problems

Like other gas powered tankless heaters, this unit is also not free from problems. The cold sandwich effect is a problem that might occur since the heater is unable to maintain constant hot water backup and thus, you have to wait for about two minutes to get hot water pouring in consistently. Moreover, the high price of this heater makes it an expensive option for a majority of families. Nonetheless, if you can afford it then it is an ideal solution to meet all sorts of your hot water demands without compromising on size, weight, design and innovation. The unit is also environmentally friendly and is a good choice for large families.

Ideal Use

All in all, the Rinnai Tankless Water Heater is a fantastic way to meet all of your hot water needs without having to resort to bulky, costly and environmentally unfriendly tank water heaters, and will ensure that the days of rationing hot water based on whatever needs it most are a thing of the past. Hot water when you want it, where you want it and however much of it you want, and all for only $200 more than the standard tank heater which will pay for itself with all of the money you will save in the long run.