Rinnai Boiler Review in 2021 – Top 3 Picks

Rinnai Boiler Reviews

LAST UPDATED: January 13th, 2021

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Everyone needs a boiler, whether it will be used to keep your house warm on a cold winter or to draw you a warm and relaxing bath. Boilers can be used from heating the water coming out of your shower and faucets, steam cleaning carpets, and even keeping your pool or hot tub warm.

Many boilers are available in the market, but one brand that a lot of users love is Rinnai. It comes with several models that you can choose from, but if you want to buy the best one, here are our top 3 picks for Rinnai Boiler Reviews. Let us find out your bet!

Top 3 Rinnai Boiler Comparison

Last update on 2021-01-26 / Affiliate links / Images from Amazon Product Advertising API

Rinnai Boiler Review in 2021

This brand has a lot of great boilers under its belt, and narrowing it down to three was not easy. But when it comes to features, these three stand out.

Rinnai M-Series Natural Gas Condensing Boiler

Rinnai M-Series Natural Gas Condensing Boiler

The first one on our list is a condensing boiler powered by natural gas. This is not only efficient, but it’s also great for the environment since it burns cleaner compared to other fossil fuels like coal.

Not to mention, the device is very compact, too, so that you can save more space, and you don’t have to worry about having to relocate your things just to make way for it. Much more, the design makes it very easy to install. It can give you a wide range of discretion, allowing you the option of mounting it on the wall.

You will also have a variety of venting selections- you can use PVC, stainless steel, CPVC, and rigid or flexible Polypropylene. And it’s suitable for two pipe systems, room air, and even single-pipe exhausts.

As for durability, the primary boiler is made of stainless steel, giving it a strong build as well as resistance to corrosion. Meanwhile, the plate exchanger is made of an alloy of copper and nickel. And this only manifests an added strength so that it will last for a long time. Probably, also a good reason why it is a great investment.

This boiler can achieve a very efficient operation with its modulating pump technology as it optimizes the transfer of heat for lower utility costs. More excitingly, it even has a rating of 95% Annual Fuel Utilization Efficiency (AFUE) because of its exceptional performance.

With its very efficient operation, you’ll be surprised to know that it produces very minimal noise. Yes, it has a very quiet operation, you won’t even notice it’s there!

Without a doubt, this series from Rinnai is totally off the charts. It has every feature you could ever need. And you don’t have to worry about it being overpriced because it is just appropriate for its performance. You’ll be getting full use of every penny if you choose this.


  • High efficiency
  • Easy to use and install
  • Has a compact design
  • Noiseless operation
  • Durability


  • Doesn’t have a self-cleaning heat exchanger

Rinnai i150SN Condensing Gas Boiler

Rinnai i150SN Condensing Gas Boiler

This boiler has been praised by many; it has been getting amazing feedback over the years because of its performance. Not to mention, it also brags of several noteworthy and unique features. It’s a justifiable pick for our top 3.

Well, it boasts of its efficiency, and like the M-Series has achieved a rating of 95% for its AFUE, one of the highest ratings achieved in the industry. More excitingly, it even received certification from Energy Star as the Most Efficient boiler in the market!

And because of its high-efficiency rate, you will able to save more when it comes to utilization costs. It can heat your entire home more evenly and faster too. This only means that with this, the cold will never bother you again.

It doesn’t stop there; it is also very durable as it’s made of stainless steel. This comes with an exclusive self-cleaning heat exchanger that has the same construction material, thereby indicating added strength. And it is coupled with a flat secondary plate heat exchanger.

Well, this product is also very flexible. Other than natural gas, you have the option of using propane gas to fuel it too. Furthermore, the boiler comes with an outdoor reset for added optimization of your home heating. It also has a modulating pump with its outdoor reset.

This boiler has earned its spot in the top 3. And although it’s slightly more expensive compared to others on this list, the quality it comes with is indisputable. Quality doesn’t come cheap, so if you do buy a boiler, look at it as an investment. It’s sure to pay off in the long run.


  • Very efficient operation
  • Can use both propane and natural gas
  • Made of very durable materials
  • High-efficiency rate
  • Has a self-cleaning heat exchanger


  • Slightly more expensive compared to others

Related Guide: EcoSmart Water Heater Review

Rinnai Q205SN Boilers

Rinnai Q205SN Boilers

Last but not the least on our top picks, has likewise earned its spot because of its efficiency and great features. It’s great for home heating, especially for larger houses with higher demand for hot water.

Like the boiler mentioned earlier, this has earned an astonishing 95.5% AFUE because of its top-notch performance. And it has also been awarded by Energy Star for Most Efficient boiler in the year 2016. It’s perfect for home heating and is sure to get the job done fast.

It has a compact design, unlike other traditional boilers so that you can fit it just about anywhere, and you will also have the option to wall-mount your boiler. You’ll also have a variety of venting options you can use, including PVC, Polypropylene, CPVC, or Stainless steel.

Not to mention, this is also suitable for room air and single to two-pipe systems. Without a doubt, it provides you with the versatility that you need. As an added feature, it has a modulating pump with an outdoor sensor to reset it. The pump varies water flow for further improved efficiency.

The primary boiler is made of stainless steel to ensure durability and resistance to corrosion. Its plate heat exchanger, on the other hand, is made with a combination of copper and nickel. Well, this particular model may be a great choice for you. The quality and performance it offers are unparalleled.

But again, quality does not come cheap. So don’t be dismayed of its price tag because if you look at its features, you’re sure that you’re getting everything that you paid for. It’s one of the best in the market.


  • Highly efficient boiler
  • Made of high-quality materials
  • Provides a variety of venting options
  • Perfect for home heating
  • Very compact size
  • Can be wall mounted


  • Comes in a slightly more expensive price tag

Things to Look for Before Buying

Having your boiler is truly essential; it can give you protection from cold winter nights and also give you a warm bath whenever you please. And while there are a lot of these products available in the market, buying one isn’t that easy.

You have to make sure it has all the features you need. So before going out to buy your own boiler, consider looking at the features on this list first so you won’t end up wasting your money.


This is among the most important features a boiler can have. High efficiency is something that you should look for in a boiler. Why? Well, simply because a boiler having high efficiency means that it makes full use of its fuel and that it converts most if not all of it to heat. It will save you a lot from utilization costs.


We all want the things we buy to last, which is why it’s important to look at the materials they are made of. This determines the durability a boiler has, make sure it is made of strong metal and as much as possible that it is resistant to developing rust.

A durable boiler will last longer, and it will save you a lot of money in the long run because you won’t have to buy new ones frequently.

Size and Installation

See to it that the boiler you’ll be buying is compact so that looking for a place to fit it in will be the least of your problems. Also, look at the options of how it can be installed, some boilers come in wall-mounted designs, which make it easier to install.

Additional Features

Some boilers are incorporated with tons of additional features — some produce minimal noise during use, others with self-cleaning exchangers. All these can greatly benefit you.

Frequently Asked Question

Which is better to use, propane or natural gas?

Although their prices may vary, you can feel free to use any of them since both offer similar heating efficiency and are great alternatives for the environment.

How often should my boiler be replaced?

Boilers last for a very long time, typically 10 to 15 years, especially if it’s of great quality and it’s taken well care of. You can choose to replace it if it begins to malfunction frequently.

How often should my boilers be serviced?

You may get your boiler serviced at least once a year just to make sure it’s properly maintained and that there are no problems with it.

Final Words

Overall, the three boilers on the list are all incredible and are great choices. They have great efficiencies, are highly durable, and easy to use. And while there are a lot of others you can choose from, the ones in this Rinnai Boiler Reviews are undoubtedly the best.

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