Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
IBC EX 400 and IBC EX 700 are two condensing boilers from the IBC Technologies EX Series line. The IBC EX 400 is documented at 40–399 MBH input, 388 MBH output and 97.9% thermal efficiency, while the IBC EX 700 is documented at 70–700 MBH input, 679 MBH output and 97% thermal efficiency. IBC EX 700 lists 301 MBH more input than IBC EX 400 (700 MBH against 399 MBH). IBC EX 400 carries the higher published thermal efficiency at 97.9%, against 97%. IBC EX 700 lists 72 lb more shipping weight than IBC EX 400 (486 lb against 414 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | IBC EX 400 | IBC EX 700 |
|---|---|---|
| CSA input, minimum | 40 MBH | 70 MBH |
| CSA input, maximum | 399 MBH | 700 MBH |
| CSA output | 388 MBH | 679 MBH |
| Thermal efficiency (ANSI/AHRI-1500) | 97.9 % | 97 % |
| Pressure vessel water content | 13.5 USG / 51.1 L | 17.5 USG / 66.3 L |
| Weight (empty) | 414 lb | 486 lb |
| Flue / combustion air | 4" Schedule 40 flue / 4" Schedule 40 combustion air | 6" Schedule 40 flue / 4" Schedule 40 combustion air |
| Max. equivalent vent length, each side | 170 ft | 120 ft |
| Water connections | 2" NPT-M | 2½" NPT-M |
| Gas connection | 1" NPT-F | 1" NPT-F |
| Max. operating water pressure | 160 psig | 160 psig |
| Maximum boiler flow rate | 100 USgpm / 378 Lpm | 100 USgpm / 378 Lpm |
| Minimum boiler flow rate | 10 USgpm | 18 USgpm |
| Power use at full fire (less pumps) | 150 W | 195 W |
| Fuel | Natural gas or propane | Natural gas or propane |
| Heating surface area | 55.3 ft² / 5.14 m² | 84.6 ft² / 7.86 m² |
| Gas supply pressure | 4 – 14 in. w.c. | 4 – 14 in. w.c. |
| Ambient temperature | 32 – 122 °F | 32 – 122 °F |
| Minimum water temperature | 34 °F | 34 °F |
| Max. water temperature (electronic hi-limit) | 190 °F | 190 °F |
| Max. ΔT supply/return | 80 °F | 80 °F |
| Minimum water pressure | 8 psig | 8 psig |
| Relief valve (supplied) | 50 psig | 50 psig |
| Altitude rating | 0 – 12,000 ft | 0 – 12,000 ft |
| Air intake | Direct vent or indoor supply | Direct vent or indoor supply |
| Condensate connection | 3/4" hose | 3/4" hose |
Published ratings: the IBC EX 400 is rated 40–399 MBH input, 388 MBH output and 97.9% thermal efficiency; the IBC EX 700 is rated 70–700 MBH input, 679 MBH output and 97% thermal efficiency. IBC EX 700 lists 301 MBH more input than IBC EX 400 (700 MBH against 399 MBH). IBC EX 400 carries the higher published thermal efficiency at 97.9%, against 97%.
IBC EX 700 lists 72 lb more shipping weight than IBC EX 400 (486 lb against 414 lb). The boiler water content differs: the IBC EX 400 lists 13.5 USG / 51.1 L, while the IBC EX 700 lists 17.5 USG / 66.3 L. The venting differs: the IBC EX 400 lists 4" Schedule 40 flue / 4" Schedule 40 combustion air, while the IBC EX 700 lists 6" Schedule 40 flue / 4" Schedule 40 combustion air. The max. equivalent vent length, each side differs: the IBC EX 400 lists 170 ft, while the IBC EX 700 lists 120 ft.
Both records print the same gas connection (1" NPT-F), maximum operating pressure (160 psig), maximum boiler flow rate (100 USgpm / 378 Lpm) and fuel (Natural gas or propane), per the cited sources.
IBC Technologies
The IBC EX 400 is the smallest floor-standing EX Series commercial boiler: 40–399 MBH input, 388 MBH output, 97.9% thermal efficiency, 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.
The IBC EX 700 lists 700 MBH, against 399 MBH on the IBC EX 400, per the cited documentation.
The IBC EX 400 carries the higher published thermal efficiency at 97.9%, against 97%.
It ships at 486 lb against 414 lb for the IBC EX 400, per the cited sources.
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.