Searching for the right combination boiler, or combi boiler for short, can be an exhaustive endeavor. Luckily, there are a few key brands that stand out from the pack. Navien is one of several brands that excel in the combi boiler department.

For over 15 years, we’ve installed and serviced standard tankless water heaters and combi boilers throughout the Greater Los Angeles area and its surrounding cities. Being partnered with Navien for over 13 years of our career gives us the know-how to properly price, install, and service its combi boilers. But what about that first one, the price?

In this article, we’ll walk you through how much a Navien combi boiler costs on its own, followed by the cost to install and what might affect that price range. Let’s get the ball rolling by looking at how much a Navien combi boiler costs so you can build a solid jumping-off point for your research.

How Much Does a Navien Combi Boiler Cost?

Addressing costs regarding combi boilers is a bit tricky. Because there is no way to account for every reader’s home size and the number of fixtures, we can’t just throw out one concrete figure for a specific model. Instead, we can give you a range to base your initial research on before you meet with a technician to discuss your options in detail.

A Navien combi boiler can cost anywhere between $3,500 to $6,000. Where your final cost for the unit hits is solely based on what model is suitable for your home. A few factors that can impact the cost of the combi boiler are the number of fixtures in your home, the space heating demand, and hot water demand.

Once you’ve decided a combi boiler is right for you, you’ll need to also account for installation costs.

How Much Does It Cost to Install a Navien Combi Boiler?

Much like pricing the unit itself, there’s no absolute answer to this question without a boots-on-the-ground survey. Instead, you can bank on your total investment on the combi boiler and installation running between $12,000 to $26,000.

The reason for this somewhat wide range is that there are quite a few factors that impact installation costs. Just like a standard tankless water heater installation, your home and its needs are the main determiners in solidifying your final investment.

Let’s take a look at some of the factors that can impact the cost of your combi boiler installation to get a better sense of what to expect.

Factors that Impact Installation Costs

As we mentioned before, there’s no way to pinpoint how much a combi boiler installation will cost you without a detailed inspection of your home. The following information is meant to set an expectation of what might drive your installation lower or higher on the previously mentioned installation cost scale.

Home Size

The size of your home not only factors in square footage for space heating but also the number of fixtures that demand hot water. Everything from additional piping runs to the number of communication boxes required is informed by your home’s needs.

In terms of installation costs, we’ve found that smaller homes require less and therefore cost less when it comes to combi boilers. On the other hand, larger homes may require more complex builds that end up on the higher end of the cost scale.


Due to the sheer variety of home types, sizes, and ages, it’s difficult to give a solid number on how much additional piping will affect installation. Things like square footage and the layout of your home’s current heating elements will play a large role in how much piping your home needs.

Relocating your combi boiler will be a main driver in how much additional piping and fittings are required.


If you upgrade to a combi boiler for the first time or plan on moving your existing system, location will play a role in your installation cost. This factor also ties back to piping since relocating systems requires technicians to reconfigure the system, including piping and venting.

Every home is different, and depending on where your combi boiler is located, you can anticipate installation to be impacted somewhere between $1,200 and $3,500.

Communication Boxes

Communication boxes are more-or-less what they sound like; they communicate with your thermostat to achieve a comfortable temperature. These devices can control up to three zones throughout your home. The larger the home, the more communication boxes may be required, influencing the installation cost.

Accounting for the cost of how many communication boxes your home requires, you can bank on the installation to flex between $900 and $2,800.

Additional Equipment

Combi boilers are complex due to pulling both space and water heating. Because of this design, additional equipment like electronic valves, air separators, and expansion tanks will play a role in your final installation cost.

In terms of cost, they typically land between $600 and $1,200.

Wrapping Up Navien Combi Boiler Cost

We’ve gone over how much a Navien combi boiler can cost for the unit alone, the installation price range, and what factors inform that price range. With this information, you can continue your research with a sound foundation of what to expect in Los Angeles County regarding Navien combi boilers.

After 15 years in the field, we know one thing for sure: every home is different. While pricing information is tough to come by without an on-site inspection, we hope this information helps shed some light on the costs associated with Navien combi boilers.

If you’re interested in speaking with a technician about installing a Navien combi boiler or another brand we carry, get in touch using one of the buttons below or book an appointment through our easy-to-use online scheduler.

After reading up on the cost of a Navien combi boiler, you might be wondering if there are any alternatives. Luckily, Navien is one of the top tankless water heater manufacturers in the industry. Check out our Navien Tankless Water Heater Guide to get a better sense of what Navien has to offer.

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