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Laars Heating Systems · Series
The Mighty Therm2 is Laars' non-condensing commercial boiler and volume water heater family for the replacement market — MT2H and MT2V models from 500 to 2000 MBTU/h plus a separate 200-400 MBH line — designed around simple, straightforward controls.
Series facts
The Mighty Therm2 is the non-condensing, replacement-market family in Laars' commercial catalogue: the category copy says it is 'specifically designed to meet the needs of the replacement market by offering simple and straightforward controls.' It spans two published ranges — MT2H hydronic boilers and MT2V volume water heaters from 500 to 2000 MBTU/h under I&O Document 1211M, and a separate 200-400 line whose page prints 'Volume Water Heater - 200, 300 or 400 MBH; Boiler - 400 MBH.'
Both ranges share the family's modular construction, which separates the burner trays, gas train and blower assembly for easy access and service. The 200-400 page's standard features add hot surface ignition, on/off firing with 2-stage optional, an ASME 160 psi working-pressure heat exchanger, glass-lined headers with external header gaskets, stainless-steel burners with a removable burner tray, and a built-in fan for Category I and III systems; the 500-2000 documentation covers wiring across 500-750, 1000 and 1250-2000 splits with two ignition controls on the 1000-2000 sizes.
The researched Mighty Therm2 material prints no thermal-efficiency percentage, so Boilers.ca does not quote one for this series. I&O Document 1211M identifies natural gas (N) and propane (P) versions in its model-code key, references CSA B149.1, and includes vent-terminal clearance notes covering U.S. and Canadian installations.
Highlights
Models
One canonical page per model with input, output and efficiency kept separate.
Laars Heating Systems
The Laars Mighty Therm2 MT2H 500 is a non-condensing commercial hydronic boiler rated 500,000 BTU/hr input and 425,000 BTU/hr output at 85% thermal efficiency with two-stage firing.
Laars Heating Systems
The Laars Mighty Therm2 MT2H 750 is a non-condensing commercial hydronic boiler rated 750,000 BTU/hr input and 638,000 BTU/hr output at 85% thermal efficiency with two-stage firing.
Laars Heating Systems
The Laars Mighty Therm2 MT2H 1000 is a non-condensing commercial hydronic boiler rated 1,000,000 BTU/hr input and 850,000 BTU/hr output at 85% thermal efficiency with two-stage firing.
Laars Heating Systems
The Laars Mighty Therm2 MT2H 1250 is a non-condensing commercial hydronic boiler rated 1,250,000 BTU/hr input and 1,065,000 BTU/hr output at 85.1% thermal efficiency with two-stage firing.
Laars Heating Systems
The Laars Mighty Therm2 MT2H 1500 is a non-condensing commercial hydronic boiler rated 1,500,000 BTU/hr input and 1,278,000 BTU/hr output at 85.1% thermal efficiency with two-stage firing.
Laars Heating Systems
The Laars Mighty Therm2 MT2H 1750 is a non-condensing commercial hydronic boiler rated 1,750,000 BTU/hr input and 1,491,000 BTU/hr output at 85.1% thermal efficiency with two-stage firing.
Laars Heating Systems
The Laars Mighty Therm2 MT2H 2000 is a non-condensing commercial hydronic boiler rated 2,000,000 BTU/hr input and 1,704,000 BTU/hr output at 85.1% thermal efficiency with two-stage firing.
Laars Heating Systems
The Laars Mighty Therm2 MT2H0400 is a non-condensing commercial hydronic boiler rated 399,000 BTU/hr input and 340,000 BTU/hr output at 85.3% thermal efficiency.
Laars Heating Systems
The Laars Mighty Therm2 MT2V0200 is a non-condensing volume water heater rated 199,900 BTU/hr input and 169,915 BTU/hr output at 85% thermal efficiency.
Laars Heating Systems
The Laars Mighty Therm2 MT2V0300 is a non-condensing volume water heater rated 300,000 BTU/hr input and 255,000 BTU/hr output at 85% thermal efficiency.
Laars Heating Systems
The Laars Mighty Therm2 MT2V0400 is a non-condensing volume water heater rated 400,000 BTU/hr input and 339,915 BTU/hr output at 85% thermal efficiency.
| Specification | Laars Mighty Therm2 MT2H 500 | Laars Mighty Therm2 MT2H 750 | Laars Mighty Therm2 MT2H 1000 | Laars Mighty Therm2 MT2H 1250 | Laars Mighty Therm2 MT2H 1500 | Laars Mighty Therm2 MT2H 1750 | Laars Mighty Therm2 MT2H 2000 | Laars Mighty Therm2 MT2H0400 | Laars Mighty Therm2 MT2V0200 | Laars Mighty Therm2 MT2V0300 | Laars Mighty Therm2 MT2V0400 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| input-min | — | — | — | — | — | — | — | — | — | — | — |
| Input | 500,000 BTU/hr | 750,000 BTU/hr | 1,000,000 BTU/hr | 1,250,000 BTU/hr | 1,500,000 BTU/hr | 1,750,000 BTU/hr | 2,000,000 BTU/hr | 399,000 BTU/hr | 199,900 BTU/hr | 300,000 BTU/hr | 400,000 BTU/hr |
| Output | 425,000 BTU/hr | 638,000 BTU/hr | 850,000 BTU/hr | 1,065,000 BTU/hr | 1,278,000 BTU/hr | 1,491,000 BTU/hr | 1,704,000 BTU/hr | 340,000 BTU/hr | 169,915 BTU/hr | 255,000 BTU/hr | 339,915 BTU/hr |
| afue | — | — | — | — | — | — | — | — | — | — | — |
| turndown | — | — | — | — | — | — | — | — | — | — | — |
| vent-max-3 | — | — | — | — | — | — | — | — | — | — | — |
| vent-max-2 | — | — | — | — | — | — | — | — | — | — | — |
| Shipping weight | 630 lb | 725 lb | 820 lb | 915 lb | 1,010 lb | 1,105 lb | 1,200 lb | 330 lb | 270 lb | 300 lb | 330 lb |
Read the full comparison: Laars Mighty Therm2 MT2H 1000 vs MT2H 1250 →
Read the full comparison: Laars Mighty Therm2 MT2V0200 vs MT2V0300 →
Read the full comparison: Laars Mighty Therm2 MT2V0300 vs MT2H0400 →
Read the full comparison: Laars Mighty Therm2 MT2H0400 vs MT2V0400 →
Error codes and alerts
No alerts documented for this series yet.
Manuals
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.
Services for Laars Heating Systems boilers
The researched Mighty Therm2 pages print no Canada restriction, the back cover of I&O Document 1211M lists Laars' Canadian office (9 Brigden Gate, Halton Hills, Ontario, Canada L7G 0A3), and the same manual's vent-terminal clearance sections cover Canadian installations. Confirm current availability with Laars Canada or an authorized Canadian distributor.
The 500-2000 family covers MT2H hydronic boilers and MT2V volume water heaters from 500 to 2000 MBTU/h (I&O Document 1211M), while the separate 200-400 line prints a volume water heater in 200, 300 or 400 MBH and a boiler at 400 MBH (I&O Document 1231). Both share the modular construction that separates burner trays, gas train and blower assembly.
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.