Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The EX 700 steps up to 679 MBH output from the EX 500's 485, moves to a 6" flue and 2½" NPT-M water connections, and cuts the vent allowance from 170 to 120 equivalent feet per side, while thermal efficiency slips from 97.5% to 97.0%.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | IBC EX 500 | IBC EX 700 |
|---|---|---|
| CSA input, minimum | 50 MBH | 70 MBH |
| CSA input, maximum | 500 MBH | 700 MBH |
| CSA output | 485 MBH | 679 MBH |
| Thermal efficiency (ANSI/AHRI-1500) | 97.5 % | 97 % |
| Power use at full fire (less pumps) | 210 W | 195 W |
| Weight (empty) | 441 lb | 486 lb |
| Pressure vessel water content | 12.4 USG / 46.9 L | 17.5 USG / 66.3 L |
| Minimum boiler flow rate | 12 USgpm | 18 USgpm |
| Max. operating water pressure | 160 psig | 160 psig |
| Max. equivalent vent length, each side | 170 ft | 120 ft |
| Water connections | 2" NPT-M | 2½" NPT-M |
| Flue / combustion air | 4" Schedule 40 flue / 4" Schedule 40 combustion air | 6" Schedule 40 flue / 4" Schedule 40 combustion air |
The EX 500 covers 50–500 MBH input and 485 MBH output; the EX 700 covers 70–700 MBH input and 679 MBH output. The 700 is the first model to move to the larger connection group: a 6" Schedule 40 flue and 2½" NPT-M water connections, with combustion air entering through a 4" collar that must transition to 6" within three feet.
Venting tightens on the larger model: 120 equivalent feet per side on the EX 700 against 170 on the EX 500, with direct-vent or indoor air supply on both. Thermal efficiency falls from 97.5% to 97.0%, and minimum boiler flow rises from 12 to 18 USgpm against the shared 100 USgpm maximum.
The EX 700 is heavier at approximately 486 lb (220 kg) versus 441 lb (200 kg) and holds more water, 17.5 USG against 12.4 USG. Both are rated 160 psig with a supplied 50 psig relief valve, approved to 12,000 ft, and documented by the EX I&O manual 120-327E10.
IBC Technologies
The IBC EX 500 is a floor-standing commercial condensing boiler rated 50–500 MBH input and 485 MBH output at 97.5% thermal efficiency, with 4" venting to 170 equivalent feet and 2" NPT-M water connections.
IBC Technologies
The IBC EX 700 is a floor-standing commercial condensing boiler rated 70–700 MBH input and 679 MBH output at 97.0% thermal efficiency, with a 6" flue, 2½" NPT-M water connections and 120 equivalent feet of vent per side.
At the EX 700. The EX 400 and EX 500 use 4" flue and 2" NPT-M water; the EX 700 and EX 850 use 6" flue and 2½" NPT-M water.
120 equivalent feet per side, against 170 feet on the EX 500.
Slightly: 97.0% thermal efficiency against 97.5% on the EX 500, both to ANSI/AHRI-1500.
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.