Navien Condensing Combi-Boiler

The Navien Condensing Combination boilers are perfect for people who need both hot water and a space heating application. It heats water in your home when needed, making it environmentally friendly and cost efficient. These tankless water heaters feature Comfort Flow Technology for faster hot water and energy efficiency up to 98%. Rated “most efficient” by Energy Star.

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1 yr / 5 yr / 15 yr warranty
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seattle wa Navien Combi Boiler installation and sales


Ultra high efficiency boiler, perfect for residential applications

The ideal solution for customers who need both domestic hot water and a space heating application. Heats water only when needed, making it environmentally sound as well as cost efficient.

Energy Star highest rated gas water heater.

The NPE series is the most energy efficient tankless water heater in the industry. Navien’s ultra condensing technology delivers cooled exhaust gas and high performance up to 0.98 EF (energy factor).

Dual stainless steel heat exchangers

Navien was the first to offer dual stainless steel heat exchangers, rather than copper, which extend the life of the unit by resisting corrosion.

Exclusive ComfortFlow technology

With an internal buffer tank and a recirculation pump, the Navien combi-boiler maintains a steady stream of heated water to eliminate “cold water sandwiches” and issues of minimal flow rate.

Automatic water filling system

Automatically fills water into space heating pipes when the unit senses a water shortage.

Powerful anti-freeze feature

The Combi’s built-in Control System is designed to keep the unit’s plumbing frost free in winter conditions.


Labor: 1 year, Parts: 5 years, Heat exchanger: 15 years



  • What are some gas boiler replacement warning signs?

    Your gas boiler may be beyond repair if:

    20+  years old

    If your boiler is over 20 years old, it is not running very efficiently.


    Hissing is associated with iron or sludge caught up in the system causing it to heat up and shut down. This may be a simple repair, but if left unattended for long enough, it could cause your boiler to break.

    Leaky Water

    Leaky water may just be a service or repair but like “Noises” you should get this checked out before it’s too late.

  • What are the advantages of radiant heating?

    Consistent comfortable heat

    Radiant heating, aka hydronic heating, provides a more consistent comfort than a forced air system. Hidden radiant systems use piping inside of floors, ceilings, and walls. The combi boiler allows you to heat your water and your whole home at the same time.

    In a forced air heated house, you might have a large variation between the temperature at the floor and up higher in the room. Houses heated with radiant systems tend to have uniform temperatures throughout each room. No wonder these systems are so popular in Seattle.

All for home.

Award-winning service and installation.

Since 1957, homeowners have come to know us for the type of best-in-class service they deserve. Frequent winners of the Angie’s List Super Service Award and perennially among the top local contractors rated by the BBB, Angie’s List and GuildQuality.

installation and technicians service home repair

A job done right

Our Home Project Advisers are ready to tailor choices to your lifestyle and budget and our installers have the experience and talent to make sure the work is done right.

Local, trusted, passionate

Since 1957 we have made homes all over the Puget Sound more efficient and comfortable. Our employees are craftsmen with a contagious enthusiasm for rolling up their sleeves and exceeding expectations.

Trained, licensed, bonded and drug tested

Each technician receives a minimum of 100 hours of on-the-job-training each year to ensure everyone is up to date on best practices. All of our employees undergo background checks and drug screens.