Williamson-Thermoflo GWC-140
The Williamson-Thermoflo GWC-140 is a 91.4% AFUE condensing boiler with a Approx. 130,000 BTU output BTU output, part of the Williamson-Thermoflo GWC Series 2 line. GasBoilers.ca installs, repairs, and maintains the GWC-140 across Greater Vancouver — Red Seal–certified, TSBC-licensed, same-day repair available. Call 604-359-1081.
Williamson-Thermoflo GWC-140 overview
The GWC Series 2 is a gas-fired hot-water condensing boiler reaching roughly 91% AFUE with direct venting. It pairs higher efficiency with a floor-standing design for homes upgrading from atmospheric chimney-vented units.
91.4% AFUE
Efficiency
Approx. 130,000 BTU output
BTU Output
Up to 12 years
Warranty
GWC-140 specifications
| Model | Williamson-Thermoflo GWC-140 |
| Series | GWC Series 2 |
| Type | condensing |
| BTU Output | Approx. 130,000 BTU output |
| Efficiency | 91.4% AFUE |
| Warranty | Up to 12 years |
| Origin | United States |
| Best for | Mid-size hydronic homes |
GWC Series 2 features
Williamson-Thermoflo GWC-140 services we provide
All work by licensed BC gas-fitters — TSBC-certified.
GWC-140 Installation
Permit, sizing, venting, gas, commissioning.
From $6,500
GWC-140 Repair
Error code diagnosis, parts, full repair.
From $189
GWC-140 Maintenance
Annual tune-up — required for warranty.
From $169
GWC-140 Replacement
Upgrade an older unit. Rebate-eligible.
From $6,500
Emergency Service
Same-day no-heat, leak, CO, gas-smell response.
Call 604-359-1081
Warranty Service
Authorized warranty repairs for Williamson-Thermoflo.
Warranty-covered
Williamson-Thermoflo GWC-140 — frequently asked questions
How much does Williamson-Thermoflo GWC-140 installation cost in Vancouver?
Williamson-Thermoflo GWC-140 installation starts from $6,500 in Greater Vancouver, including permit, code-compliant venting and gas piping, removal of the old unit, and full commissioning. Final pricing depends on your existing system and a heat-loss calculation. Call 604-359-1081 for a free quote.
What size is the Williamson-Thermoflo GWC-140?
The Williamson-Thermoflo GWC-140 has a heating output of Approx. 130,000 BTU output BTU, with 91.4% AFUE efficiency. It is best suited to mid-size hydronic homes.
Do you repair the Williamson-Thermoflo GWC-140?
Yes. We diagnose and repair the Williamson-Thermoflo GWC-140 — error codes, ignition faults, no-heat, leaks, low pressure, and sensor issues — from $189. Our technicians are factory-trained on Williamson-Thermoflo GWC Series 2 units and carry common parts on the truck.
How often should the Williamson-Thermoflo GWC-140 be serviced?
Williamson-Thermoflo recommends annual maintenance to keep the GWC-140 efficient, safe, and within warranty (up to up to 12 years). Our maintenance service starts from $169.
Williamson-Thermoflo GWC-140 service across Greater Vancouver
We service the GWC-140 in every major Greater Vancouver city.
Book Williamson-Thermoflo GWC-140 service today
Same-day repair available · Free installation quotes · Licensed gas-fitters