Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The MLX EXT 2600 and 3000 are physically identical (63.9" wide × 38.3" deep × 57.2" high, 3" gas, 4" water, 12" vent); the 3000 adds an eighth thermal module, raising maximum input from 2,677,000 to 3,060,000 BTU/hr, deepening turndown from 34:1 to 39:1 and adding 115 lb wet weight, with 9.2 GPH condensate against 7.7 GPH.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | AERCO Modulex EXT MLX 2600 | AERCO Modulex EXT MLX 3000 |
|---|---|---|
| Min. input | 83 MBH | 83 MBH |
| Max. input | 2,677 MBH | 3,060 MBH |
| Max. output | 2,583 MBH | 2,951 MBH |
| Efficiency (up to) | 98.6 % | 98.6 % |
| Efficiency range | 87–99 % | 87–99 % |
| Turndown or operating range | 34:1 | 39:1 |
| Gas connection | 3" flange | 3" flange |
| Water connection | 4" flange | 4" flange |
| Thermal modules | 7 | 8 |
| Electrical requirement (120 V) | 17.5 FLA | 20 FLA |
| Vent and air inlet size | 12" | 12" |
| Width | 63.9 in | 63.9 in |
| Depth | 38.3 in | 38.3 in |
| Height | 57.2 in | 57.2 in |
| Weight, wet | 1,549 lb | 1,664 lb |
| Weight, shipping | 1,776 lb | 1,891 lb |
| Condensate production | 7.7 gal/hr | 9.2 gal/hr |
These are the top of the Modulex EXT range: seven thermal modules in the 2600 and eight in the 3000. AERCO prints 2,677,000 BTU/hr maximum input and a 2,334,000–2,583,000 BTU/hr output range for the 2600, against 3,060,000 and 2,668,000–2,951,000 for the 3000.
The 3000 carries the line's deepest turndown at 39:1 versus 34:1, and draws 20 FLA against 17.5 FLA. Both share the same 12" vent, 92 psi working pressure and 83 MBH minimum input.
The cabinet is identical — 63.9" × 38.3" × 57.2" — so the only installation deltas are weight (1,549 vs 1,664 lb wet; 1,776 vs 1,891 lb shipping) and condensate load (7.7 vs 9.2 GPH). When the load is near 2,600 MBH, the smaller unit is the more precisely matched machine.
AERCO (Watts)
The AERCO Modulex EXT MLX 2600 is a condensing multi-module commercial boiler rated 2677 MBH maximum input and a 2,334,000–2,583,000 BTU/hr output range in AERCO's published ratings table, with 34:1 turndown across 7 independent thermal modules and a 1549 lb wet weight.
AERCO (Watts)
The AERCO Modulex EXT MLX 3000 is a condensing multi-module commercial boiler rated 3060 MBH maximum input and a 2,668,000–2,951,000 BTU/hr output range in AERCO's published ratings table, with 39:1 turndown across 8 independent thermal modules and a 1664 lb wet weight.
The MLX EXT 3000 at 39:1, against 34:1 for the MLX EXT 2600.
Yes — both print 63.9" wide × 38.3" deep × 57.2" high in the TDS dimensions table.
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.