American-built cast-iron and condensing boilers
Williamson-Thermoflo manufactures gas-fired residential boilers in the United States, spanning traditional cast-iron water and steam units to modern wall-mounted stainless-steel condensing models. The lineup covers atmospheric cast-iron designs for chimney-vented homes as well as high-efficiency FreeStyle condensing boilers available in heat-only and combi configurations.
3 series · 7 individual models. Click any series for full specs, pricing, and installation details.
Wall-mounted 95% AFUE condensing boiler, heat-only or combi
The FreeStyle Series 2 is a wall-mounted gas-fired condensing boiler with a stainless-steel heat exchanger and modulating combustion rated at 95% AFUE. It is offered in heat-only and combination (combi) versions across three input sizes, with flexible PVC, CPVC, PP or stainless venting.
Efficiency
Up to 95% AFUE
BTU Range
80,000 - 155,000 BTU input
Models
3
High-efficiency cast-aluminum hot-water condensing boiler
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.
Efficiency
Up to 91% AFUE
BTU Range
Approx. 130,000 BTU output (140 size)
Models
1
Durable atmospheric cast-iron hot-water boiler
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.
Efficiency
Up to 84% AFUE
BTU Range
38,000 - 233,000 BTU input
Models
3
Permit pulled, full commissioning, warranty registration.
Diagnose error codes, faults, and failures across all models.
Annual service keeps warranty valid and efficiency high.
Same-day no-heat, leak, gas-smell & CO-alarm response.
We service Williamson-Thermoflo boilers in every Greater Vancouver community. Same-day response in our core service area.
Real 5-star Google reviews from CANRO Boiler Service & Repair customers across Greater Vancouver.
Nikita Bhatia
Joe and Allan are a great team. They gave me the right advice and helped me make a good decision with my heating system. Professional, knowledgeable, and a genuine pleasure to deal with from start to finish.
William
Canro boiler services were genuine life savers. I was stuck without heat overnight and they came by and got my boiler running again. Fast, professional, and genuinely caring about their customers. Could not recommend them more highly.
Arlene Colasurdo
Five stars for Canro Boiler Service and Repair. We needed a replacement of a 30-year-old boiler. A new high-efficiency unit was installed professionally and efficiently. The difference in heating performance and cost savings has been remarkable.
Same-day repair · Free install quotes · Licensed BC gas-fitters