Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
Laars MagnaTherm MGH 3000 and Laars MagnaTherm MGH 3500 are two condensing boilers from the Laars Heating Systems MagnaTherm line. The Laars MagnaTherm MGH 3000 is rated 600–3,000 MBH input, 2,814 MBH output and 95% thermal efficiency, and the Laars MagnaTherm MGH 3500 is rated 700–3,500 MBH input, 3,276 MBH output and 95% thermal efficiency. Laars MagnaTherm MGH 3500 lists 500 MBH more input than Laars MagnaTherm MGH 3000 (3,500 MBH against 3,000 MBH). Both list the same published thermal efficiency of 95%. Laars MagnaTherm MGH 3500 lists 493 lb more shipping weight than Laars MagnaTherm MGH 3000 (2,478 lb against 1,985 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Laars MagnaTherm MGH 3000 | Laars MagnaTherm MGH 3500 |
|---|---|---|
| Input, minimum | 600 MBH | 700 MBH |
| Input, maximum | 3,000 MBH | 3,500 MBH |
| Output, minimum | 563 MBH | 655 MBH |
| Output, maximum | 2,814 MBH | 3,276 MBH |
| Efficiency (thermal) | 95 % | 95 % |
| Turndown | 5:1 | 5:1 |
| Water content | 31 gal | 56 gal |
| Shipping weight | 1,985 lb | 2,478 lb |
| Efficiency (combustion) | 93.8 % | 93.6 % |
Published ratings: the Laars MagnaTherm MGH 3000 is rated 600–3,000 MBH input, 2,814 MBH output and 95% thermal efficiency; the Laars MagnaTherm MGH 3500 is rated 700–3,500 MBH input, 3,276 MBH output and 95% thermal efficiency. Laars MagnaTherm MGH 3500 lists 500 MBH more input than Laars MagnaTherm MGH 3000 (3,500 MBH against 3,000 MBH). Both list the same published thermal efficiency of 95%.
Laars MagnaTherm MGH 3500 lists 493 lb more shipping weight than Laars MagnaTherm MGH 3000 (2,478 lb against 1,985 lb). The boiler water content differs: the Laars MagnaTherm MGH 3000 lists 31 gal, while the Laars MagnaTherm MGH 3500 lists 56 gal.
Both records print the same thermal efficiency (95%) and turndown (5:1), per the cited sources.
Laars Heating Systems
The Laars MagnaTherm MGH 3000 is a commercial condensing water-tube boiler and volume water heater rated 600-3,000 MBH input and 563-2,814 MBH output at 95% boiler thermal efficiency, with 31 gallons of water content and a 1985 lb shipping weight.
Laars Heating Systems
The Laars MagnaTherm MGH 3500 is a commercial condensing water-tube boiler and volume water heater rated 700-3,500 MBH input and 655-3,276 MBH output at 95% boiler thermal efficiency, with 56 gallons of water content and a 2478 lb shipping weight.
The Laars MagnaTherm MGH 3500 lists 3,500 MBH, against 3,000 MBH on the Laars MagnaTherm MGH 3000, per the cited documentation.
Both list the same thermal efficiency of 95%.
It ships at 2,478 lb against 1,985 lb for the Laars MagnaTherm MGH 3000, per the cited sources.
A consultation includes a heat-loss review so the size is right the first time.
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.