Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
Both the Laars Mascot LX MLX 50 and the Laars Mascot LX MLX 75 belong to the Laars Heating Systems Mascot LX (discontinued) line of combination (combi) boilers. The Laars Mascot LX MLX 50 is rated 50,000 BTU/h input, 47,500 BTU/h output and 95% AFUE, and the Laars Mascot LX MLX 75 is rated 75,000 BTU/h input, 71,250 BTU/h output and 95% AFUE. Laars Mascot LX MLX 75 lists 25,000 BTU/h more input than Laars Mascot LX MLX 50 (75,000 BTU/h against 50,000 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 50 | Laars Mascot LX MLX 75 |
|---|---|---|
| Input | 50,000 BTU/h | 75,000 BTU/h |
| Output | 47,500 BTU/h | 71,250 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 | None built in — heating-only model; hot water comes from a separate tank or water heater |
| 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 | 88 lb | 97 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 50 is rated 50,000 BTU/h input, 47,500 BTU/h output and 95% AFUE; the Laars Mascot LX MLX 75 is rated 75,000 BTU/h input, 71,250 BTU/h output and 95% AFUE. Laars Mascot LX MLX 75 lists 25,000 BTU/h more input than Laars Mascot LX MLX 50 (75,000 BTU/h against 50,000 BTU/h). Both list the same published AFUE of 95%.
The boiler shipping weight differs: the Laars Mascot LX MLX 50 lists 88 lb, while the Laars Mascot LX MLX 75 lists 97 lb.
Both records print the same AFUE (95%), domestic-hot-water arrangement (None built in — heating-only model; hot water comes from a separate tank or water heater), water connections (3/4" NPT) and gas connection (1/2" NPT), per the cited sources.
Laars Heating Systems
The Laars Mascot LX MLX 50 is a discontinued wall-mounted modulating boiler rated 50,000 BTU/h input and 47,500 BTU/h output at 95% AFUE, with 3/4" NPT water connections and a 88 lb shipping weight.
Laars Heating Systems
The Laars Mascot LX MLX 75 is a discontinued wall-mounted modulating boiler rated 75,000 BTU/h input and 71,250 BTU/h output at 95% AFUE, with 3/4" NPT water connections and a 97 lb shipping weight.
The Laars Mascot LX MLX 75 lists 75,000 BTU/h, against 50,000 BTU/h on the Laars Mascot LX MLX 50, 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.