Plumbing, Heating and Pool Repair Guides

Rinnai Q205S Condensing Wall Mounted Gas Boiler


Rinnai has a great reputation for their water heaters but they also have a complete line of Condensing Wall Mounted Gas Boilers. These boilers are energy efficient and they are Energy Star rated.

One of their products is the Q205S Condensing Wall Mounted Gas Boiler. This boiler is a fully modulating pump that works in conjunction with the stainless steel heat exchanger. This boiler in particular offers a 95.7% AFUE ratings that is one of the best rated in the industry.

These boilers have an optional 3-way valve that was created to help remove the need for the pump on the indirect tank. The Rinnai Q205S offers an outdoor reset function with a sensor, which comes included. These boilers are also available in Natural Gas or Propane. This Series Offers a minimum input of 41,000 natural gas and a maximum of 205,000. The liquid propane minimum input is 74,000 BTU’s and the maximum of 205,000 BTU’s. The maximum flow rate works with an indirect tank.

The Rinnai Q205S unit is compact and measures in at 26 inches in width x 27 inches in height x 15 inches in depth. There is a digital controller, which is model RS100. This controller offers a simple to use control system that allows you to program your boiler with accuracy. The controller offers an adaptive room control with a local override of the room temperature. There are some great features such as the three clock programs and three weeks profile program and there is a program for holidays.

These condensing wall-mounted boilers have a stainless steel primary boiler heat exchanger. There is an exceptionally quiet operation, which allows your home to be heated and gives you peace of mind. These boilers offer an even heating system so there are no more cold spots. There are a variety of venting options that you can use with a direct venting system. There is a dual pipe adaptor included with the boiler and it comes ready to be installed right out of then box. There is no putting it together just set it up and go.

It is recommended that you hire a qualified technician to install these boilers. You should read all of the recommendations such as clearances and requirements. By hiring a professional installer you could keep your warranty in tact. If you are interested in getting more information on the Q205S, contact your local Rinnai Sales Distributor, on the Rinnai website there is a find a dealer link, click on your zip code and call your local representatives. Now is the perfect time to check into a new boiler and start saving some money right away.


  1. I want to purchase a renai 150,000 btu propne wall mounted furnace. hot water to radiators. pipeing already exists.

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