Williamson-Thermoflo GWA Series 3
Durable atmospheric cast-iron hot-water boiler · ~$5,500–$7,700 installed · Up to 84% AFUE · 604-359-1081
We supply & install — we do not sell equipment on its own. Every GasBoilers.ca price includes professional installation by Red Seal–certified BC gas-fitters, permit, and commissioning.
604-359-1081 — exact installed quoteThe 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.
Efficiency
Up to 84% AFUE
Output
38,000 - 233,000 BTU input
Warranty
Up to 12 years
Type
Cast-iron
Features
- Cast-iron sections with built-in air separator
- Insulated heavy-gauge steel jacket
- One-piece access door with all controls in easy reach
- Low water cut-off
- Natural gas or propane operation
- Natural-draft chimney venting
- Factory tested
- Seven input sizes from 38K to 233K BTU
Best For
- Budget-conscious cast-iron replacements
- Homes with existing lined chimneys
- Reliable long-life hydronic heating
GWA Series 3 Models
Williamson-Thermoflo GWA-100
100,000 BTU input BTU · 84% AFUE · Smaller homes
Williamson-Thermoflo GWA-166
166,000 BTU input BTU · 84% AFUE · Mid-size homes
Williamson-Thermoflo GWA-233
233,000 BTU input BTU · 84% AFUE · Larger homes with high heat load
What the Installed Price Includes
Approximate installed price — every home is different. Final cost depends on your existing system, venting, gas line, and a heat-loss calculation. Call 604-359-1081 for an exact quote.
More on the Williamson-Thermoflo GWA Series 3
Get an exact Williamson-Thermoflo GWA Series 3 quote
604-359-1081 · We supply & install — approximate prices shown, call for your exact number.