Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
Boilers.ca is a brand of ROMA Heating & Cooling · Licensed gas contractor LGA0202903
Brand hub
De Dietrich's North American arm — DDR Americas Inc., in Cambridge, Ontario — warehouses and assembles De Dietrich boilers for the USA and Canada; the NA lines are the GT Series (eutectic cast-iron, non-condensing) and the MCA Pro (condensing cast-aluminum wall-hung), with the GT line introduced to North America in 1997.
At a glance
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
De Dietrich is a French heating brand whose official international site (dedietrich-heating.com) maps both Canada and the USA to dedietrichboilers.com, the official 'De Dietrich North America' site of DDR Americas Inc. DDR Americas' own page states it is 'located in Cambridge Ontario' (1090 Fountain St. N., Unit 10, Cambridge, Ontario N3E 1A3) and is 'able to warehouse and assemble boilers to satisfy the demanding boiler market in USA and Canada' — an official and explicit Canadian statement.
The NA catalogue (©2019 DDR Americas, with technical copy treated as stable) has two boiler families: the GT Series of flexible eutectic (graphite-flake) cast-iron sectional boilers — GT120A (input range 94–166 MBH) up through GT 530A/AE Plus — which was 'introduced to the North American market in 1997 through distribution', and the MCA Pro Series of condensing, fully modulating wall-hung boilers with cast-aluminum heat exchangers (45–115 kW / 156–399 MBH), the product line behind De Dietrich's 2007 entry into the North American condensing market. The earlier C230/C310 NA condensing line survives only as a parts category.
EU-market lines (such as the Innovens family on dedietrich-heating.com) are not sold through the NA site and are not hubbed here. DDR Americas publishes brochures, I&O manuals and full documentation as public PDFs on the NA product pages.
Series
Each series hub lists its models, verified specifications, manuals and documented alerts.
The De Dietrich GT Series is a flexible eutectic (graphite-flake) cast-iron sectional boiler line — non-condensing, in NA since 1997 and assembled/warehoused in Cambridge, Ontario — spanning the GT120A (94–166 MBH input) up to the GT 530A/AE Plus.
The De Dietrich MCA Pro is a condensing, fully modulating wall-hung boiler with a cast-aluminum heat exchanger — in NA since 2007 — sized 45/65/90/115 kW (156/235/326/399 MBH input range) for residential and light-commercial gas or propane applications, with cascade configurations of 2 to 8 boilers.
Models
De Dietrich
The De Dietrich GT 123A is a 3-section eutectic cast-iron 3-pass boiler rated 94 MBH gas input / 80 MBH output (0.65 GPH on oil) at a printed AFUE of 85.5% gas / 88% oil, with 1-1/4" supply and return connections.
De Dietrich
The De Dietrich GT 124A is a 4-section eutectic cast-iron 3-pass boiler rated 115 MBH gas input / 98 MBH output (0.8 GPH on oil) at a printed AFUE of 85.5% gas / 88% oil, with 1-1/4" supply and return connections.
De Dietrich
The De Dietrich GT 125A is a 5-section eutectic cast-iron 3-pass boiler rated 144 MBH gas input / 122 MBH output (1 GPH on oil) at a printed AFUE of 85.5% gas / 88% oil, with 1-1/4" supply and return connections.
De Dietrich
The De Dietrich GT 126A is a 6-section eutectic cast-iron 3-pass boiler rated 166 MBH gas input / 141 MBH output (1.15 GPH on oil) at a printed AFUE of 85.5% gas / 88% oil, with 1-1/4" supply and return connections.
De Dietrich
The De Dietrich GT 224A is a 4-section eutectic cast-iron 3-pass commercial boiler rated 173 MBH gas input / 147 MBH output (1.2 GPH on oil) at a printed 85.2% gas efficiency (oil +3 points), with R1 1/4 supply and return connections.
De Dietrich
The De Dietrich GT 225A is a 5-section eutectic cast-iron 3-pass commercial boiler rated 224 MBH gas input / 190 MBH output (1.55 GPH on oil) at a printed 85.2% gas efficiency (oil +3 points), with R1 1/4 supply and return connections.
De Dietrich
The De Dietrich GT 226A is a 6-section eutectic cast-iron 3-pass commercial boiler rated 274 MBH gas input / 233 MBH output (1.9 GPH on oil) at a printed 85.2% gas efficiency (oil +3 points), with R1 1/2 supply and return connections.
De Dietrich
The De Dietrich GT 227A is a 7-section eutectic cast-iron 3-pass commercial boiler rated 324 MBH gas input / 276 MBH output (2.25 GPH on oil) at a printed 85.2% gas efficiency (oil +3 points), with R1 1/2 supply and return connections.
De Dietrich
The De Dietrich GT 228A is a 8-section eutectic cast-iron 3-pass commercial boiler rated 361 MBH gas input / 307 MBH output (2.5 GPH on oil) at a printed 85.2% gas efficiency (oil +3 points), with R1 1/2 supply and return connections.
De Dietrich
The De Dietrich GT 334A is a 4-section eutectic cast-iron 3-pass commercial boiler rated 404 MBH gas input / 344 MBH output (2.8 GPH on oil) at a printed 85.2% gas efficiency (oil +3 points), with 2-1/2" threaded female supply and return.
De Dietrich
The De Dietrich GT 335A is a 5-section eutectic cast-iron 3-pass commercial boiler rated 598 MBH gas input / 510 MBH output (4.15 GPH on oil) at a printed 85.2% gas efficiency (oil +3 points), with 2-1/2" threaded female supply and return.
De Dietrich
The De Dietrich GT 336A is a 6-section eutectic cast-iron 3-pass commercial boiler rated 808 MBH gas input / 688 MBH output (5.6 GPH on oil) at a printed 85.2% gas efficiency (oil +3 points), with 2-1/2" welded pipe with distributor tube supply and return.
De Dietrich
The De Dietrich GT 337A is a 7-section eutectic cast-iron 3-pass commercial boiler rated 1024 MBH gas input / 872 MBH output (7.1 GPH on oil) at a printed 85.2% gas efficiency (oil +3 points), with 2-1/2" welded pipe with distributor tube supply and return.
De Dietrich
The De Dietrich GT 338A is a 8-section eutectic cast-iron 3-pass commercial boiler rated 1226 MBH gas input / 1044 MBH output (8.5 GPH on oil) at a printed 85.2% gas efficiency (oil +3 points), with 2-1/2" welded pipe with distributor tube supply and return.
De Dietrich
The De Dietrich GT 339A is a 9-section eutectic cast-iron 3-pass commercial boiler rated 1442 MBH gas input / 1229 MBH output (10 GPH on oil) at a printed 85.2% gas efficiency (oil +3 points), with 2-1/2" welded pipe with distributor tube supply and return.
De Dietrich
The De Dietrich MCA Pro 45 is a condensing wall-hung boiler rated 34–156 MBH input and 33–146 MBH output at 94.0% CSA thermal efficiency, with 1-1/4" heating connections and a 117 lb dry weight.
De Dietrich
The De Dietrich MCA Pro 65 is a condensing wall-hung boiler rated 34–235 MBH input and 45–222 MBH output at 94.0% CSA thermal efficiency, with 1-1/4" heating connections and a 133 lb dry weight.
De Dietrich
The De Dietrich MCA Pro 90 is a condensing wall-hung boiler rated 55–326 MBH input and 54–306 MBH output at 94.0% CSA thermal efficiency, with 1-1/4" heating connections and a 148 lb dry weight.
De Dietrich
The De Dietrich MCA Pro 115 is a condensing wall-hung boiler rated 82–399 MBH input and 79–368 MBH output at 94.0% CSA thermal efficiency, with 1-1/4" heating connections and a 150 lb dry weight.
Services
On-site service in Greater Vancouver. Brand and model context is kept when you request service.
Error codes and alerts
Documented meanings resolved against the specific series, controller and manual version. A code is not a diagnosis.
Manuals and documents
Links go to the manufacturer's own documents. Boilers.ca does not reproduce manuals.
Yes — and the statement is official. DDR Americas Inc. is based in Cambridge, Ontario and states it can 'warehouse and assemble boilers to satisfy the demanding boiler market in USA and Canada'.
DDR Americas Inc. is at 1090 Fountain St. N., Unit 10, Cambridge, Ontario, Canada N3E 1A3, per its official page.
The two North American families: the GT Series (non-condensing eutectic cast iron) and the MCA Pro (condensing cast-aluminum wall-hung). EU-only lines and the legacy C230/C310 parts category are excluded.
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.