We know boilers and radiant heat systems!Design-Install-Service-Repair For Seattle

  • Steam & Hot Water
  • Radiant Floor and Ceiling
  • Radiators
  • Domestic Hot Water
  • Tub Warming
  • Swimming Pools
  • Hot Tubs
  • Greenhouses and more

Who should you call for custom boiler work in Seattle?Seattle radiant heat install

Carlson Mechanical specializes in custom boiler work, including expert installation, repair, service, and troubleshooting on everything from modern high-efficiency boilers to rare and exotic systems of yesteryear.

We provide residential and commercial service to the entire Seattle metro area including the Eastside communities from Woodinville to Bellevue to Renton.

Our friendly and knowledgeable technicians work on residential, multi-family and light commercial projects of all sizes. They can install your new custom boiler or hot water heat system; we even install and service pool boilers and water heaters but do not work on forced air systems.

Installing radiant heat in your home?Seattle Hot-water heat system

The craftsmen at Carlson Mechanical are experts at designing and installing radiant heat systems in new or older homes throughout the Seattle area.

Whether you call it radiant, hot-water or hydronic heat, it offers the highest comfort level with its even natural heat. Plus, it eliminates dust and contaminants of forced air systems making it perfect for people with allergies or asthma.

Pick from several delivery systems from radiant floor heating to contemporary panel radiators to stylish heated towel bars for your bathroom. For added convenience, we can install a smart thermostats to control your new system so you can change the temperature settings via your phone or tablet.

Why choose us for your remodeling or install?

We believe communication is the key to a successful install so to ensure all goes well from start to finish, we follow these best practices.

  • Easy to understand estimates
  • Answers to all your questions
  • Follow-up after project completion

Whatever your needs, our craftsmen can create an elegant system designed to last a lifetime.  Contact us to schedule your free estimate for a radiant heating system in your home or business.

Benefit from our experience working with contractorsInstall Radiant Heat Seattle

Carlson Mechanical has worked with a variety of general contractors in Seattle, Snohomish and Eastside areas on new construction and remodeling projects.

Our vast experience in hot water heat systems means we can design and install the perfect configuration whether you're building a custom home or remodeling your house.

We think it speaks well that the same contractors come back to us year after year because they trust our work and know we treat all customers with respect.

In addition, we don’t disappear after the work is done.  We stay in touch to make sure the system is operating correctly and our customers are happy with their new heating system.

Your company can really be proud of your employees, their work in putting the new boiler furnace in my home. They were very organized, efficient and worked steadily, even when answering the many questions given to them. They were always on time, bright and cheerful and friendly all the time they were here.

The Hoalonds

Ready for the steamy details?

Just click any thumbnail for a detailed description.

  • Knight Fire Tube Boiler
  • Noble Fire Tube Boiler
  • Lochnivar Knight XLT
  • Burnam Gas Boiler
  • Viessman Vitodens Boiler
  • Burnham Oil Boiler

Residential Lochnivar Knight Fire Tube Boiler

Knight High Efficiency Wall Mounted Boiler

Lochnivar Knight Fire Tube boiler

This Energy Star compliant wall mounted boiler is the best green choice for residential and light commercial uses. Innovative features include the SMART SYSTEM control and Loch-N-Link USB drive setup, which put it far ahead of other boilers in its class.


  • 95% AFUE efficiency
  • Updated SMART SYSTEM control
  • ASME Stainless steel heat exchanger
  • 7 wall mount models: 55,000-399,999 BTU/HR
  • Modulating burner with up to 10:1 turndown
  • Low NOx operation
  • CON-X-US Remote connect capable
  • Warranties: Limited 15-year heat exchanger, Limited 5-year parts

Residential Noble Fire Tube Combi Boiler

Combination boiler for Domestic Hot Water and Space Heating

Noble Fire Tube Combi boilerThe space saving Noble Combi boiler is a game changer that provides domestic hot water and space heating faster and more efficiently. It’s a money saving alternative for homes with 1 or 2 bathrooms.


  • 95% AFUE efficiency
  • SMART Control enhanced operating system
  • User-friendly backlit LCD display gives diagnostic info in real words
  • 10:1 Turndown ratio
  • Faster response time eliminates cold water sandwich
  • Innovative fire tube heat exchanger
  • 3 sizes: 110,000, 150,000 and 199,999 BTU/HR

Lochnivar Knight XL

Lochnivar Knight Commercial Boiler


Knight XL is the best of commercial heating boilers with SMART SYSTEM control and other advanced technology that makes it a great “green choice.”


  • Up to 94.6% thermal efficiency
  • Fully modulating burner
  • 2 in1 Stainless steel heat exchanger
  • 7 Direct venting options up to 100 feet
  • Firing rate modulation to 5:1
  • SMART SYSTEM Operating control/built-in cascading sequencer
  • 5 models: 399,999-800,000 BTU/HR
  • Low NOx certified

Burnham gas-fired steam boiler

Burnham Independence Series Boilers


Available for steam or hot water applications in either a natural draft or power vent configuration, the Independence is a quiet, reliable, and efficient boiler.


  • Up to 83% efficient
  • Steam boiler
  • Optional water boiler with tankless coil
  • Natural or LP gas
  • Natural draft or power vented
  • Reliable cast iron sectional design
  • Rated output: 62 to 385 MBH in 10 sizes

Viessman Vitodens 100-W

Viessman gas-fired condensing boiler


If you’re looking for value, this gas-fired wall-mounted condensing boiler is great for any home and budget. It’s quieter than most refrigerators while delivering energy efficiency and performance.


  • 95% AFUE efficiency
  • Stainless steel Inox-radial heat exchanger
  • Low-emission combustion
  • On-board boiler control
  • Multiple venting options up to 200’
  • Built-in automatic frost protection
  • Works in altitudes up to 10,000 ft.
  • Optional on-demand domestic hot water kit

Burnham oil-fired steam boiler

Burnham MegaSteam™ Oil-fired Steam Boiler


The MegaSteam boiler has been exclusively designed by Burnham engineers using a 3-pass, cast iron, sectional design that is unequaled in the industry. MegaSteam sections are produced in Burnham's own state-of-the-art foundry, and at 86% AFUE, MegaSteam boilers are ENERGY STAR® certified as the most efficient oil-fired steam boilers available


  • High Efficiency 86% AFUE
  • New, Unique, Burnham Engineered 3-Pass Design
  • 4 Sizes Available
  • High Corrosion Resistance with Extended Waterside Warranty
  • Superior Steam Quality
  • Tankless Heater Available
  • Best Steam Boiler Warranty in the Industry
  • 0.75 - 1.65 GPH

Design and Installation of Hot-Water Heat SystemsHot Water Heating System

In a hot water heating system, the boiler plays a central role as it heats the water or steam that is then circulated around the house.

Because of this, you want and need a boiler that is reliable and delivers service every day.

The boilers, installed by Carlson Mechanical, are from trusted leading boiler manufacturers, such as Lochinvar, Burnham, Viessmann and Triangle Tube. 

It’s important to know that not everyone installs boilers the same way!

Using the latest technology, combined with proven, time-tested engineering, Carlson Mechanical has developed its own unique installation method to provide maximum comfort and last for the life of your Seattle area home.

One of the smartest things we have done is change to your high efficiency gas boilers. Since we did it, the cost of heating our 3 buildings has gone down over 50%. The removing and installing operations went seamlessly and all the personnel that worked on the project were outstanding and extremely conscientious to our needs.

Ron and Nancy, Green Lake Cooperative


We can use your boiler to heat your domestic water 50 to 500% faster and 10 to 45% cheaper than a conventional gas or electric water heater.  Your same boiler can be used to heat a hot tub, swimming pool, or even a green house.

Experts in Steam SystemsRepair Hot Water Heat Systems

More art than science, the correct replacement and repair of a steam boiler is a rare skill today.

Installing new, modern steam boilers is a specialty of Carlson Mechanical.

The boiler must be viewed as part of your heating system that also includes your home's radiators, air vents and piping.

The craftsmen at Carlson Mechanical have the knowledge and skill to ensure a complete, properly working steam heat system.

Ultimate control-whole home automation

Once your new hot water heating system is in place, we offer thermostats so you can control the temp in your home no matter where you are-at the office, stuck in traffic or away on holiday.

Whole home automation gives you the freedom to check and change your thermostat from your phone, laptop or anywhere that you have internet access.

You’ll have the ultimate control over your home’s heating system and that’s not only convenient, it’ll save you money and energy.

Home automation

Plumbing service and repair

Our journeyman plumbers are licensed to handle gas piping repair and installation along with various re-piping projects and installing water heaters.

Our plumbers have over 90 years of combined experience so they can handle just about anything.