Rinnai Gas Boilers
Review and Buying Tips

Rinnai gas boilerRinnai gas boiler

Explore Rinnai gas boilers for water heating, flexible in installation, powerful, high performing and ultra-efficient for significant savings and durable work.


Models review

Rinnai manufacturer has been producing a wide variety of gas boilers that are grouped in three categories: Q Premier, Q series and E series, all utilizing quality elements and the advanced condensing technology for the efficient whole-house central and domestic water heating.

Rinnai boilers from E series are the smallest and as such can be mounted on the wall easily, including the models from Q series.

Models from Q Premier are larger and heavier and therefore designed as the floor standing, also with the space saving design. Every model comes with the safety features, smart technology and elements such as the outdoor temperature sensor that allows the boiler to provide desired comfort level, continually and for a long time.

The main features found on all models include the down-fired and self-cleaning stainless steel heat exchanger that guarantees long life and high performance, One-Side Sealed construction that prevents damages during the heat stress and built-in circulation pump for the faster hot water delivery. With the modulating gas valve, Rinnai boilers consistently provide desired power, by decreasing or increasing the power, resulting in decent savings and enhance comfort.

Rinnai Q Premier

Rinnai Q Premier boilers utilize the stainless steel water tank with a capacity of 24 gallons and can produce enough power for high hot water demands in large houses.

Measured 23.6” x 61.8” x 25.2”, these units can be used in the existing heating system as a retrofit or in new houses; while its easily accessed connections provide simple and fast installation, and with the pre-piped setup and installed pump the user can benefit when utilizing the hot water recirculation system. The approximate weight is 236 pounds.

There are two models available; QP85N with the maximum gas input of 85,000 BTU and larger QP130N with the 130,000 BTU, where the energy efficiency for both models is close to 96%, resulting in the Energy Star approval and reduced energy losses. Both models are factory built to use natural gas, and with the approved Rinnai conversion kit, these boilers can be converted to use the propane gas instead. Both models have the turndown ratio of 5:1, which allows power modulation from its maximum to its minimum of 17,000 BTU/26,000 BTU while the First Hour Rating is 141 gal/h for QP85N and 211 gal/h for the QP130N model.

Rinnai boilers from Q Premier series are covered with the 12-year warranty on the heat exchanger and water storage tank.

Rinnai Q series

Rinnai Q series is the most extensive group of condensing boilers, and it consists of the following models: Q85S, Q130S, Q175S, Q175C and Q205S, all made for residential and some commercial applications. All the models, with the maximum weight of 141 lbs. are much lighter than the floor standing models from Q Premier group, and with the size of 26“x26.8”x15.2,” it is guaranteed that the user will benefit from the flexible and space-saving installation – on the wall.

The maximum heating capacity is from 85,000 to 205,000 BTU, where the modulating gas valve can reduce the power to 17,000 BTU, which leads to a turndown ratio of 5:1 for most models. All the models have the ultra-high energy efficiency ranging from 95 to 95.4% and can work with the separate indirect hot water tank, except the Q175C model that is used for space and potable water heating, with the maximum flow rate of 4.1 gal/min.

It utilizes natural gas or propane gas and is field compatible for easy conversion. It does not include the storage water tank but is indirect tank compatible.

Rinnai E series

Rinnai boilers from E series are also combi boilers that can be used to heat water for the central heating system and producing domestic hot water. Due to its sizes and heat output, they are recommended for homes with one to two bathrooms.

There are three models available: E50C, E75C, and E110C, having the gas input in the range from 50,000 to 110,000 BTU, all ultra-efficient and Energy Star approved. As opposed to the Q series and Premier Q series, series E also comes with two heat exchangers, one made of stainless steel, and the other made of softer but corrosion resistant copper.

The boilers from E series are the smallest and lightest of all Rinnai gas boilers, so handling is even easier. The boiler’s display and the function buttons on the front panel, found on the Q models also, allowing the user control of the central heating, hot water and pump programming.

E75 has a single speed pump and integrated expansion tank.

RelatedRinnai RUR98

Key features

  • Down-fired and self-cleaning stainless steel heat exchanger
  • One-Side Sealed construction
  • Built-in circulation pump
  • Modulating gas valve
  • Stainless steel water tank


Find Trusted Plumbers & Get Free Quotes

Popular articles