Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The SVB-3 and SVB-4 are adjacent sizes in the current SVB Series 4 induced-draft cast-iron water line — both non-condensing boilers with a Honeywell high-limit/electronic-ignition control and chimney or sidewall venting. The SVB-4 fires 112.5 MBH against 75 MBH, printing 95 MBH of heating capacity (63) and a 82 MBH net AHRI water rating (55); both allow a 3" sidewall vent, with boiler water rising from 3 to 4.25 gal and shipping weight from 265 to 322 lb.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Utica SVB-3 | Utica SVB-4 |
|---|---|---|
| Input | 75 MBH | 112.5 MBH |
| Heating capacity | 63 MBH | 95 MBH |
| Net AHRI water rating | 55 MBH | 82 MBH |
| AFUE | 84 % | 84 % |
| Vent — chimney | 4" | 4" |
| Vent — sidewall | 3" | 3" |
| Boiler water content | 3 gal | 4.25 gal |
| Dimensions (W x H x D) | 14¼ × 29 × 23¼ | 17½ × 29 × 23¼ |
| Shipping weight | 265 lb | 322 lb |
Both models are SVB Series 4 cast-iron water boilers — non-condensing with fixed input, an induced-draft fan that allows chimney or sidewall exhaust, cast-iron push nipples, titanium composite burners and a recessed Honeywell high-limit/electronic-ignition control with digital temperature display and diagnostics.
The sell-sheet table prints 75 MBH input with 63 MBH heating capacity and a 55 MBH net AHRI water rating on the SVB-3, against 112.5 MBH, 95 MBH and 82 MBH on the SVB-4; the SVB-3 carries the line's top rating of 84.4% AFUE against 84% on the SVB-4.
Venting and footprint scale with the size: chimney vent is 4" on both, both allow a 3" sidewall vent, and the cabinet grows from 14¼ × 29 × 23¼ in to 17½ × 29 × 23¼ in as water content rises from 3 to 4.25 gal and weight from 265 to 322 lb. A heat-loss calculation decides between them; installation belongs with a licensed contractor.
Utica Boilers
The Utica SVB-3 is a size in the current SVB Series 4 cast-iron water line: 75 MBH fixed input, 63 MBH heating capacity, a 55 MBH net AHRI water rating and 84% AFUE, with induced-draft chimney (4") or sidewall (3") venting. It is tagged 'Current' on Utica's Gas Boilers category page.
Utica Boilers
The Utica SVB-4 is a size in the current SVB Series 4 cast-iron water line: 112.5 MBH fixed input, 95 MBH heating capacity, a 82 MBH net AHRI water rating and 84% AFUE, with induced-draft chimney (4") or sidewall (3") venting. It is tagged 'Current' on Utica's Gas Boilers category page.
112.5 MBH input against 75 MBH, 95 MBH heating capacity against 63 MBH, and a 82 MBH net AHRI water rating against 55 MBH, per the official SVB Series 4 sell sheet.
Yes — the induced-draft fan allows chimney or sidewall exhaust: SVB-3 uses 4" chimney and 3" sidewall; SVB-4 uses 4" chimney and 3" sidewall.
No — every SVB Series 4 is a non-condensing cast-iron boiler with an induced-draft fan and chimney or sidewall exhaust.
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.