Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Laars Mascot LX MLX 125 and Laars Mascot LX MLX 150 are both combination (combi) boilers in the Laars Heating Systems Mascot LX (discontinued) line. The Laars Mascot LX MLX 125 is rated 125,000 BTU/h input, 118,750 BTU/h output and 95% AFUE, and the Laars Mascot LX MLX 150 is rated 150,000 BTU/h input, 142,500 BTU/h output and 95% AFUE. Laars Mascot LX MLX 150 lists 25,000 BTU/h more input than Laars Mascot LX MLX 125 (150,000 BTU/h against 125,000 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 125 | Laars Mascot LX MLX 150 |
|---|---|---|
| Input | 125,000 BTU/h | 150,000 BTU/h |
| Output | 118,750 BTU/h | 142,500 BTU/h |
| Efficiency (AFUE) | 95 % | 95 % |
| Domestic hot water | 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 | MLXC combi available at this size — domestic water at 3.7 gpm at a 75°F rise through the combination boiler, 1/2" NPT DHW connection |
| Water connection | 3/4" NPT | 1" NPT |
| Gas connection | 1/2" NPT | 1/2" NPT |
| Fuel | Natural gas or propane | Natural gas or propane |
| DHW output at 75°F rise | 3.1 GPM | 3.7 GPM |
| Boiler shipping weight | 126 lb | 140 lb |
| Combi shipping weight | 133 lb | 148 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 125 is rated 125,000 BTU/h input, 118,750 BTU/h output and 95% AFUE; the Laars Mascot LX MLX 150 is rated 150,000 BTU/h input, 142,500 BTU/h output and 95% AFUE. Laars Mascot LX MLX 150 lists 25,000 BTU/h more input than Laars Mascot LX MLX 125 (150,000 BTU/h against 125,000 BTU/h). Both list the same published AFUE of 95%.
The domestic-hot-water arrangement differs: 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, while the Laars Mascot LX MLX 150 lists MLXC combi available at this size — domestic water at 3.7 gpm at a 75°F rise through the combination boiler, 1/2" NPT DHW connection. The water connections differs: the Laars Mascot LX MLX 125 lists 3/4" NPT, while the Laars Mascot LX MLX 150 lists 1" NPT. The dhw output at 75°F rise differs: the Laars Mascot LX MLX 125 lists 3.1 GPM, while the Laars Mascot LX MLX 150 lists 3.7 GPM.
Both records print the same AFUE (95%), gas connection (1/2" NPT), fuel (Natural gas or propane) and high altitude (De-rate 4% per 1,000 ft above 2,000 ft), per the cited sources.
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.
Laars Heating Systems
The Laars Mascot LX MLX 150 is a discontinued wall-mounted modulating boiler rated 150,000 BTU/h input and 142,500 BTU/h output at 95% AFUE, with 1" NPT water connections and a 140 lb shipping weight. An MLXC combi version of this size is rated 3.7 gpm at a 75°F rise.
The Laars Mascot LX MLX 150 lists 150,000 BTU/h, against 125,000 BTU/h on the Laars Mascot LX MLX 125, 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.