Performance 84 Carrier BW3 Gas-Fired Boiler

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BW3, Rated heating output: 36,000-186,000 Btu/h, hot-water output
The Carrier BW3 – 84.4% AFUE, Standard Efficiency, Gas-Fired Water Boiler. This product is a brand new genuine Carrier water boiler.

  • Single-stage gas valve
  • Rated heating output: 36,000-186,000 Btu/h
  • Gas-fired, hot-water output
Financing Available Apply now with Synchrony

Model Performance 84 Carrier BW3 Gas-Fired Boiler are the answer to energy-efficient residential hydronic heating. These boilers provide quality design in a small, compact unit easily installed in a basement, garage, or utility room. They can be installed on a combustible floor when an optional combustible floor base is used. The BW3 boilers are CSA certified for use with natural gas and are field convertible for use with propane gas when a factory-authorized conversion kit is used.


Standard Features:

  • Up to 84.4% AFUE​​
  • Cast-iron heat exchanger
  • Stainless titanium alloy burners
  • Electronic spark to pilot ignition
  • Single-stage gas valve
  • Combination high-limit and circulator relay
  • Integrated pressure relief valve
  • Sidewall venting with available accessory power venter
  • Section seals are cast iron push nipple type
  • Propane convertible



  • Painted, steel outer casing in taupe metallic
  • Dimensions: 29″H x 23.25″D; width varies by size: 11″-27.25″


Range of Capacities – The BW3 boiler is available in sizes from 42,500 to 225,000.
Completely Packaged – Each boiler is completely assembled, including all controls (except thermostat and expansion tank). All necessary wiring is factory installed, except for the circulator pump. The boiler is ready for gas, water, room thermostat, and electrical connections.

This Carrier Water Boiler is what you can expect. It comes with a 10-year parts limited warranty, giving you confidence in your Carrier unit. To the original owner, when product is used in an owner-occupied residence, a 10-year parts limited warranty upon timely registration of your new equipment. Warranty period is 5 years on parts if not registered within 90 days. Jurisdictions where warranty benefits cannot be conditioned on registration will automatically receive a 10-year parts limited warranty. See warranty certificate for details.

Thermal-Pin, Cast-Iron Sections – These sections speed heat transfer from the flue gases to the boiler water with faster thermostat response, providing greater comfort and economy. Maximum heat is produced at a lower level on the thermal-pin sections, leading to peak efficiency.

Integral Draft – These boilers incorporate an integral draft system to simplify installation. No external draft diverter is needed.

Titanium Composite Burners – Provide quiet operation, corrosion resistance and improved combustion efficiency. Propane convertible – with accessory kit.

Other Controls – An automatic gas valve and continuous pilot or intermittent pilot provide quiet, dependable operation of the burners. Factory-installed safety components assure protection against overheating and pressure build-up. A factory-authorized accessory kit is available for protection against low water operation where required by local code. The circulator is pre-wired with 6-ft. of BX conduit for easy installation for supply-side plumping.

Insulated Casing – The casing is fully insulated with fiberglass for maximum operating efficiency and economy.

Automatic Vent Damper – The BW3 boiler is an induced draft design and does not require or use an automatic vent damper. These boilers are category 1 for venting purpose.

Sections Tested – Each section is hydrostatically tested to 50 psig. Individual sections are tested to 125 psig at factory. Assembled sections are tested to 75 psig at the factory. The maximum allowable pressure is 50 psig for hot water boilers.

Paired correctly with an outdoor Air Conditioner, it can aid efficiency to help you save on your energy dollars. For assistance with system matching, Get a free, no-obligation in-home estimate.

At GSHA Services – official Carrier Dealer Chicago , we provide the highest level of quality in all of HVAC installation, to best serve your. We also keep our boiler installation reasonable and affordable. We offer 5 different Carrier Boiler, ranging from the industry leading Performance 84 Carrier BW3 Gas-Fired Boiler to the base efficiency Comfort™ 80 Gas-Fired Boiler, to best serve your budget.