Baxi · Baxi Luna (North America)
Baxi Luna Duo-tec 40GA
The Baxi Luna Duo-tec 40GA is a 125 MBH wall-hung condensing combi on baxiboilers.com — 95% AFUE as printed, 7:1 DHW-mode turndown and 3.9 GPM @ 70°F temperature rise — modelled from its official current product page.
Key figures
- Max input
- 125 MBH
- Max CSA output
- —
- AFUE
- —
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Baxi Luna Duo-tec 40GA in practice
The Luna Duo-tec 40GA sits in the Combi Boilers group of Baxi North America's live /products/boilers category. The official page was live with full feature bullets and current documentation on 2026-09-09, carried no discontinued banner, and is not on the official discontinued hub, so this record's productStatus is 'current'. Its page copy reads: "A high efficiency modulating condensing combi wall-mounted boiler with built-in safety & performance enhancing components." Boilers.ca records the feature bullets as printed: 125 MBH input, 95% AFUE, ENERGY STAR certified, a 5.5:1 central-heating and 7:1 DHW-mode turndown with 3.9 GPM @ 70°F temperature rise, the Stainless steel ANSI 316L pre-mixed burner and heat exchanger, a Two-speed modulating pump with built-in air vent, 17.72"(w) x 13.59"(d) x 30"(h) dimensions and a 102 lb weight.
The official 40GA and 1.33GA pages print identical spec rows (dimensions and weight) because they are the combi and heating versions of the same platform — Boilers.ca records each page's printed rows as they appear.
Vent material prints as coaxial or two-pipe polypropylene and Gas Type as Natural Gas / Propane on the official page; Baxi North America's manuals for this platform are printed for Canada/USA installers, but no Canada-specific availability wording appears on baxiboilers.com, so canadianStatus stays 'unknown' and the record exists for information and service planning. Gas, combustion and venting work on an installed unit belongs with a licensed contractor against the model's own I&O manual (posted on the official product page).
Best suited to
- Homes needing a wall-hung combi that makes domestic hot water on demand at the Luna Duo-tec 40GA rating
- Retrofit planning against a Baxi Luna-era wall-hung platform still listed by the manufacturer
- Installations that can vent in coaxial or two-pipe polypropylene per the official page
Applicability and support
- Model number
- Luna Duo-tec 40GA
- Canadian availability
- unknown
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Not verified
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.
Specifications
Published specifications
Values as published by Baxi. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input (as printed) | 125 MBH | Page feature bullet '125 MBH Input', as printed. |
| Efficiency | ||
| Efficiency (as printed) | 95% AFUE | Page feature bullet '95% AFUE', as printed — a page bullet rather than a published test-table rating. |
| Domestic hot water | ||
| Domestic hot water flow rate (as printed) | 3.9 GPM @ 70°F temperature rise | Page bullet 'Domestic hot water flow rates 3.9 GPM @ 70°F temperature rise', as printed. |
| Venting and air | ||
| Vent material (as printed) | Coaxial or two-pipe polypropylene | Page bullet 'Vent Material; coaxial or two-pipe polypropylene', as printed; the I&O manual holds the full venting rules for each configuration. |
| Physical and connections | ||
| Burner / heat exchanger (as printed) | Stainless steel ANSI 316L pre-mixed burner and heat exchanger | Page feature bullet, as printed. |
| Dimensions (as printed, W x D x H) | 17.72"(w) x 13.59"(d) x 30"(h) | Page feature bullet 'Dimensions: 17.72"(w) x 13.59"(d) x 30"(h)', as printed. |
| Weight (as printed) | 102 lb | Page feature bullet 'Weight: 102lbs', as printed. |
| Operating limits and other | ||
| ENERGY STAR (as printed) | Certified | Page feature bullet 'ENERGY STAR® Certified', as printed. |
| Turndown, central-heating mode (as printed) | 5.5:1 | Page bullets print '5.5:1 Turndown modulation ratio in central heating mode' and '7:1 Turndown modulation ratio in DHW mode'. |
| Turndown, DHW mode (as printed) | 7:1 | Page bullet '7:1 Turndown modulation ratio in DHW mode', as printed. |
| Circulator pump (as printed) | Two-speed modulating pump with built-in air vent | Page feature bullet, as printed. |
| Additional printed features | Enhanced stainless steel secondary heat exchanger delivers domestic hot water; Approved for closet installation | Page feature bullets, as printed. |
| Gas type (as printed) | Natural Gas / Propane | Page bullet 'Gas Type: Natural Gas / Propane', as printed. |
| Combustion management (as printed) | THINK combustion management system with GAC (gas adaptive control) | Page bullets, as printed on the GA-family pages. |
| Ignition | Electronic ignition with freeze-protection safety device | Page bullets 'Electronic Ignition' and 'Freeze Protection Safety Device', as printed. |
Manuals
Alerts documented for this model
- 09
- 10
- 15
- 20
- 28
- 40
- 50
- 53
- 55
- E72/E92
- E83
- 84-85
- 86-87
- 109
- 110
- 117
- 118
- 125
- 128
- 130
- 131
- 133
- 134
- 135
- 160
- 162/317
- 169
- 164/384
- 165/385
- E178
- E62
- E63/E65
- E65
- E67
- E69
- E70
- E73
- E00
- E01
- E02
- E03
- E04
- E05
- E06
- E07
- E08
- E09
- E10
- E11
- E12
- E14
- E16
- E17
- E34
- E35
- E36
- E37
- E38
- E39
- E41
- E42
- E43
- E44
- Su:0
- Su:1
- Su:2
- Su:7
- Su:8
- Su:9
- Su:10
- Su:11
- Su:13
- Su:15
- Su:16 (1)
- Su:17 (1)
- Su:18 (1)
- Su:19 (1)
- Su:20 (1)
- Su:21
- Su:22
- Su:25 (1)
- Su:29 (2)
- Su:30 (2)
- Su:33
- Su:34 (2)
- Su:35
Frequently asked questions
Is the Baxi Luna Duo-tec 40GA discontinued?
No — as of 2026-09-09 the official Luna Duo-tec 40GA page on baxiboilers.com is live in the Combi Boilers category with current documentation and no discontinued banner, and the line is absent from the official discontinued hub. The discontinued Luna pages (Luna 3 Comfort, Fi, HT, Q) belong to earlier generations.
Is the Luna Duo-tec 40GA a combi or heating-only boiler?
A combi: it produces domestic hot water on demand inside the unit, and the page prints its DHW flow and DHW-mode turndown alongside the central-heating ratings.
Why does Boilers.ca show 'CHW mode' turndown on the MP models?
The official MP pages print the turndown bullet as a 'CHW mode' ratio — a typo for the central-heating mode that the research pass flagged. Boilers.ca keeps the value and records the wording as printed on the page.
Questions about the Baxi Luna Duo-tec 40GA?
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.
Compare and explore
- Baxi Duo-tec Compact 30GA vs Luna Duo-tec 40GAComparison
- Baxi Luna Duo-tec 40GA vs Luna Duo-tec 60GAComparison
- Baxi Duo-tec Compact 30GASame series
- Baxi Luna Duo-tec 60GASame series
- Baxi Luna Duo-tec 1.33GASame series
- Baxi Luna Duo-tec 1.48GASame series
- Baxi Luna Duo-tec 1.70MPSame series
- Baxi Luna Duo-tec 1.110MPSame series
- Baxi Luna (North America) series hub
- Buying guide
Sources and verification
- Baxi Boilers — Luna Duo-tec 40GA product page · accessed September 9, 2026
- Baxi Boilers — Boilers (Combi Boilers / Heating Boilers) · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.