IBC SL 20-115 G2 Gas Boiler

The IBC SL 20-115 G2 Boiler is a condensing gas boiler featuring a unique heat exchanger design to enhance your energy efficiency.

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IBC Boiler installation seattle



The radiant heat allows for heating from the floors to the ceiling for overall comfort.


Since no blowers are needed to transfer heat, your home can be warmed up nice and quietly.


Even after the boiler is turned off, the radiant heat from the floors continues to transfer throughout your home for hours.

Energy efficient

Condensing models are 95% AFUE.

Touch screen boiler controller

LCD display
Easy to use
USB programmability
True native BACnet intuitive alert system

Installation flexibility

With supply and return connections on both sides of the boiler your installation can’t get any easier. Use the left side, the right side or both – the choice is yours

Industry-leading turndown ratio

Industry-leading turndown ratio of 5.75:1 means you have the power to heat your home in the coldest weather, yet reduce short cycling when the weather is mild.



  • 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.