Rinnai RL75 Tankless Water Heater Review

Rinnai RL75 indoor and outdoor water heaters review. Top features and benefits of the Energy Star qualified Rinnai tankless water heaters RL75i and RL75e.

These two Rinnai tankless water heaters belong to the "Luxury" series, a series that is built for providing hot water for the medium and large size homes. RL75 models are high efficient and Energy Star approved (EF, energy factor is 0.82), which makes them eligible for government tax breaks and other utility rebates.

Features

RL75 series, as said before contains two models; RL75i and RL75e, both with the same power of 180,000 Btu's and hot water delivery of 7.5 GPM. These two features is what make models RL75i and RL75e recommended for homes with the 2-3 bathrooms.

Commercial grade components

Thanks to its commercial grade components, Rinnai RL75 heaters can be used in both residential and commercial applications, utilizing both LP and natural gas. One of the most important elements in tankless water heaters is the heat exchanger and Rinnai designs one which has the great thermal transfer while it is exposed to the minimal thermal stress.

Capacity

As other models from Rinnai, the minimum water flow needed to activate RL75 unit is low 0.4 GPM, which makes it great in situations where low flow is needed, such as shaving or hand/face washing and for low-flow fixtures.

On the other side 7.5 gallons is its maximum capacity, but EZConnect system allows two identical models to be connected into one system and provide even more hot water, for the tub, spa or larger home. For larger applications there is an option to connect up to 25 tankless units by using the multi-unit control system.

Small size

Rinnai water heaters RL75 with its attractive design fits everywhere, inside or outside. No worries if it is installed inside as it feature the sealed-combustion system with a zero clearance. Small size of 14 x 22.9 x 9.6 inches allows Rinnai tankless water heaters flexible, wall-mounted installation and valuable space-saving.

Rinnai RL75 models

rinnai rl75i

Rinnai RL75i is an indoor tankless water heater that is designed to use both natural and propane gas with the concentric vent-type venting system; one pipe is for getting the fresh air from the outside while other is for the exhaust.

Designed as the direct-vent tankless water heater it can expel the products of combustion horizontally through the single wall and vertically with the roof penetration. It can even be installed in any room.

Rinnai RL75e is for the outdoor installations only, usually installed in a recessed enclosure, and it does not utilize any vent pipes.

rinnai rl75e

Safety elements

Flame rod for the flame failure
Combustion fan rpm check
Boiling protection
Glass fuse for over current
Thermal fuse
Automatic frost protection
Remaining flame - OHS
Factory equipped with the condensate trap and drain line

Specifications

12-year limited warranty on heat exchanger and 5 years on other parts
MC-91-1US controller is supplied with the water heater - part of the front panel
Meets California and Texas NOx emission requirements
Direct electronic ignition
Maximum working temperature is 140 F, minimum is 98 F
Gas and water fitting size is 3/4"
Water pressure range is from 20-150 PSI
Isolation and pressure relief valves are included
Certified for mobile and manufactured home installations
Dimensions: 9.6 x 14 x 22.9"
Weight: 50 pounds