Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
Laars Mascot LX MLX 100 and Laars Mascot LX MLX 125 are two combination (combi) boilers from the Laars Heating Systems Mascot LX (discontinued) line. The Laars Mascot LX MLX 100 is documented at 100,000 BTU/h input, 95,000 BTU/h output and 95% AFUE, while the Laars Mascot LX MLX 125 is documented at 125,000 BTU/h input, 118,750 BTU/h output and 95% AFUE. Laars Mascot LX MLX 125 lists 25,000 BTU/h more input than Laars Mascot LX MLX 100 (125,000 BTU/h against 100,000 BTU/h). Both list the same published AFUE of 95%.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Laars Mascot LX MLX 100 | Laars Mascot LX MLX 125 |
|---|---|---|
| Input | 100,000 BTU/h | 125,000 BTU/h |
| Output | 95,000 BTU/h | 118,750 BTU/h |
| Efficiency (AFUE) | 95 % | 95 % |
| Domestic hot water | None built in — heating-only model; hot water comes from a separate tank or water heater | MLXC combi available at this size — domestic water at 3.1 gpm at a 75°F rise through the combination boiler, 1/2" NPT DHW connection |
| Water connection | 3/4" NPT | 3/4" NPT |
| Gas connection | 1/2" NPT | 1/2" NPT |
| Fuel | Natural gas or propane | Natural gas or propane |
| Boiler shipping weight | 112 lb | 126 lb |
| High altitude | De-rate 4% per 1,000 ft above 2,000 ft | De-rate 4% per 1,000 ft above 2,000 ft |
Published ratings: the Laars Mascot LX MLX 100 is rated 100,000 BTU/h input, 95,000 BTU/h output and 95% AFUE; the Laars Mascot LX MLX 125 is rated 125,000 BTU/h input, 118,750 BTU/h output and 95% AFUE. Laars Mascot LX MLX 125 lists 25,000 BTU/h more input than Laars Mascot LX MLX 100 (125,000 BTU/h against 100,000 BTU/h). Both list the same published AFUE of 95%.
The domestic-hot-water arrangement differs: the Laars Mascot LX MLX 100 lists None built in — heating-only model; hot water comes from a separate tank or water heater, while the Laars Mascot LX MLX 125 lists MLXC combi available at this size — domestic water at 3.1 gpm at a 75°F rise through the combination boiler, 1/2" NPT DHW connection. The boiler shipping weight differs: the Laars Mascot LX MLX 100 lists 112 lb, while the Laars Mascot LX MLX 125 lists 126 lb.
Both records print the same AFUE (95%), water connections (3/4" NPT), gas connection (1/2" NPT) and fuel (Natural gas or propane), per the cited sources.
Laars Heating Systems
The Laars Mascot LX MLX 100 is a discontinued wall-mounted modulating boiler rated 100,000 BTU/h input and 95,000 BTU/h output at 95% AFUE, with 3/4" NPT water connections and a 112 lb shipping weight.
Laars Heating Systems
The Laars Mascot LX MLX 125 is a discontinued wall-mounted modulating boiler rated 125,000 BTU/h input and 118,750 BTU/h output at 95% AFUE, with 3/4" NPT water connections and a 126 lb shipping weight. An MLXC combi version of this size is rated 3.1 gpm at a 75°F rise.
The Laars Mascot LX MLX 125 lists 125,000 BTU/h, against 100,000 BTU/h on the Laars Mascot LX MLX 100, per the cited documentation.
Both list the same AFUE of 95%.
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.