Williamson-Thermoflo GWA Series 3
GWA Series 3 Overview
The GWA Series 3 is an atmospheric cast-iron gas hot-water boiler rated at 84% AFUE with a built-in air separator. Its rugged sectional design and chimney venting make it a dependable, budget-friendly choice for traditional hydronic systems.
Up to 84% AFUE
Efficiency
38,000 - 233,000 BTU input
Max BTU
Up to 12 years
Warranty
Key Features
Best for
GWA Series 3 Model Lineup
Click to call for sizing help — we calculate heat-loss before recommending a model.
Services we provide on the GWA Series 3
All work done by licensed BC gas-fitters — TSBC-certified.
GWA Series 3 Installation
Permit, sizing, venting, gas, commissioning.
From $5,500
GWA Series 3 Repair
Error code diagnosis, parts, full repair.
From $189
GWA Series 3 Maintenance
Annual tune-up — required for warranty.
From $169
Emergency Service
Same-day & after-hours no-heat, leak, CO, gas-smell response.
Call 604-359-1081
GWA Series 3 Replacement
Upgrade an older unit. Rebate-eligible.
From $5,500
Warranty Service
Authorized warranty repairs for Williamson-Thermoflo.
Warranty-covered
Williamson-Thermoflo GWA Series 3 service across Greater Vancouver
Service the GWA Series 3 in every major Greater Vancouver city.
Book Williamson-Thermoflo GWA Series 3 service today
Same-day repair available · Free installation quotes · Licensed gas-fitters