Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The BMK 2500 and BMK 3000 are physically identical (28" × 56" × 78", 2" gas, 4" water) and both print 15:1 turndown, so the choice is capacity and efficiency: the 3000 adds 500 MBH of maximum input and about 480 MBH of output range while printing 94.6% thermal efficiency against the 2500's 93.5%, at 170 lb more dry weight.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | AERCO Benchmark 2500 | AERCO Benchmark 3000 |
|---|---|---|
| Min. input | 167 MBH | 200 MBH |
| Max. input | 2,500 MBH | 3,000 MBH |
| Max. output | 2,400 MBH | 2,880 MBH |
| Thermal efficiency (80–180°F) | 93.5 % | 94.6 % |
| Efficiency range | 87–98 % | 87–98 % |
| Turndown ratio | 15:1 (7%) | 15:1 (7%) |
| Gas connection (NPT) | 2" | 2" |
| Water connection (flanged) | 4" | 4" |
| Weight, dry | 2,000 lb | 2,170 lb |
| Shipping weight | 2,200 lb | 2,300 lb |
| Width (A) | 28 in | 28 in |
| Depth (B) | 56 in | 56 in |
| Height (C) | 78 in | 78 in |
AERCO's ratings table prints 2175–2400 MBH output for the 2500 and 2610–2880 MBH for the 3000, with maximum inputs of 2,500 and 3,000 MBH. Minimum inputs rise from 167 to 200 MBH, so the larger unit has a higher low-fire floor.
Efficiency favours the 3000 in this pairing: 94.6% versus 93.5% thermal efficiency at 80º–180ºF (the 2500 is the lowest row in the Benchmark table), with both sharing the 87%–98% range.
Installation is otherwise a wash: identical 28" width, 56" depth and 78" height, the same 15:1 (7%) turndown, 2" NPT gas and 4" flanged water connections. Dry weight is 2,000 lb vs 2,170 lb and shipping 2,200 lb vs 2,300 lb — a modest difference that rarely decides the selection on its own.
AERCO (Watts)
The AERCO Benchmark 2500 (BMK 2500) is a condensing gas-fired firetube commercial boiler rated 2500 MBH maximum input and a 2175–2400 MBH output range in AERCO's published ratings table, at 93.5% thermal efficiency (87%–98% range), with 15:1 (7%) turndown and a 2000 lb dry weight.
AERCO (Watts)
The AERCO Benchmark 3000 (BMK 3000) is a condensing gas-fired firetube commercial boiler rated 3000 MBH maximum input and a 2610–2880 MBH output range in AERCO's published ratings table, at 94.6% thermal efficiency (87%–98% range), with 15:1 (7%) turndown and a 2170 lb dry weight.
Yes — AERCO's dimensions table prints 28" wide × 56" deep × 78" high for both.
The TDS prints 93.5% thermal efficiency for the BMK 2500 and 94.6% for the BMK 3000 at 80º–180ºF.
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.