Read This If You Are Wondering Whether The Rinnai RL75i Is For You

Rinnai RL75iP Propane Tankless Water Heater

When looking for a tankless water heater, products from Rinnai cannot be left out. Rinnai water heaters are among the most expensive but you do get what you pay for. Many people have found that the features and quality they provide is well worth the price. The RL75i is part of Rinnai Luxury Series. By heating water only when you need it, the on demand water heater can be a great way to save energy. This model is designed for medium-sized homes. Let us take a closer look at some of the prominent features associated with the tankless unit.

The Rinnai R75 LSi Tankless Water Heater is available in two models: RL75iN and RL75iP. The RL75iN uses natural gas while the RL75iP runs on propane. The indoor water heating system is designed to deliver up to 7.5 gallons of hot water per minute (GPM). It is ideal for homes with up to three bathrooms. It is capable of supplying enough water for three showers and one sink. According to a study conducted by the American Water Works Association, the average flow rate of showerheads is about 2.2 GPM. The typical flow rate of water in a sink is 1 GPM.

The non-condensing tankless water heater provides 0.26 to 7.5 gallons per minute (GPM) of hot water capacity (1.0 – 28.5 L/min) at 40° F rise. Minimum activation rate is 0.4 GPM. Generally, we want our water heated to around 110°. If you live in a warm climate (Southern US States), your groundwater temperature can be as warm as 70 degrees. With a 40 degree fahrenheit temperature rise, the output temperature of the water coming from the heater can reach 110 degrees at a maximum flow of 7.5 GPM. If the incoming water temperature in your place is, for example, 40 degrees, this water heating system can only heat up to 4.2 gallons per minute. You can see the map of groundwater temperatures in US here to determine whether it is the right model for you.

Its gas consumption input is 10,300 – 180,000 BTU/H for either natural gas or liquid propane. Units with an input of 165,000 BTU are generally sufficient to provide a small family with enough hot water. Just keep in mind that it also depends on the temperature setting and the inlet water temperature. The RL75i has direct electronic ignition system that automatically lights the burner. No pilot light means no hassle. It operates on normal household 120 volt AC current. In terms of electrical consumption, this hot-on-demand system only uses 2 watt on standby.

The RL75i is an ENERGY STAR certified tankless water heater which means it is an energy-efficient product. There are a number of criterias to be met before an instantaneous gas water heater can be labeled as ENERGY STAR. The Energy Factor (EF) must be greater than or equal to .82. Energy factor measures the efficiency of a water heater to transfer the heat to the water. The product must also be able to raise the water temperature 77 degrees at 2.5 GPM or higher. Further, the manufacturer is required to provide a minimum 10 year warranty on heat exchanger and 5 years on parts. The RL75i comes with 12-year warranty on heat exchanger, 5 year on parts, and 1 year on labor for residential installations.

The Rinnai water heater produces hot water at the temperature setting. It is supplied with the MC-91-2 controller which is integrated into the front panel. Located on the control panel are up and down buttons that enable you obtain the desired temperature setting. Temperature settings from 98-110 °F are available. The default maximum temperature is 120° F (49° C). As you know, water temperatures over 125° F can cause severe burns. On/Off Button, Temperature Display, In Use Indicator, Priority Button, and Priority Indicator can be found on the control panel. If something wrong with the unit, an error code will be displayed on the LCD screen. Water flow rate and outgoing water temperature can also be viewed on the LCD display. You can lock the controller to prevent accidental or unauthorized changes to water temperature by pressing the Priority button and the up button together for 5 seconds.

At 46 lbs, the RL75i is a wall-mounted gas appliance. It measures 14″ width x 23″ height x 9.3″ depth which means it occupies only about 2 cubic feet, allowing you to enjoy space savings. The energy-efficient water heating system is also certified for installation in manufactured (mobile) homes. It can be installed at altitudes as high as 10,200 feet with out any extras. When it comes to service connections, this direct-vent tankless water heater uses 3/4 inch supply lines and requires a 3/4 inch gas pipe. Unlike V-Series products, it accepts EZConnect, a least expensive method for operating two units together. The Rinnai RL75i meets California and Texas NOx Emissions Standards. Lower CO2 emissions means cleaner air and a healthier environment. It uses outside air for combustion that makes it very safe.

The RL75iN and RL75iP have received positive reviews from its customers at Amazon.com. Overall, majority of customers are satisfied with its performance. However, some negative views have also been voiced by the reviewers. Tank less water heaters are considered the wave of the future. But as with any appliance, there are drawbacks. Before anything else, it is important to keep in mind that there are no such things as intant water heaters. Expect a slight delay in getting hot water at the tap. However, some of the customers have found this delay to be inconvenient.

To many people, operation met their expectations. They have reported that this thing heats up the water really hot. It can easily keep up with more than one shower running simultaneously. Just remember to annually clean the thing out as recommended. It must be flushed to prevent damage to the heat exchanger. As of installation, customer feedback suggests that this unit iss easy to mount and plumb. It comes with a set of valves so you do not need to order them. Some people chose to go the DIY route. Before ordering this unit online, however, it is best to see how many people in your area can install and service this thing to ensure you will get enough support in case of trouble.


Click here to read what Amazon’s customers have said about the Rinnai RL75iP Propane Tankless Water Heater. Click here for the Rinnai RL75iN Natural Gas Tankless Water Heater.


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