Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The SVB-5 and SVB-6 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-6 fires 187.5 MBH against 150 MBH, printing 158 MBH of heating capacity (127) and a 135 MBH net AHRI water rating (109); the sidewall vent steps from 3" to 4", with boiler water rising from 5.5 to 6.75 gal and shipping weight from 370 to 431 lb.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Utica SVB-5 | Utica SVB-6 |
|---|---|---|
| Input | 150 MBH | 187.5 MBH |
| Heating capacity | 127 MBH | 158 MBH |
| Net AHRI water rating | 109 MBH | 135 MBH |
| AFUE | 84 % | 84 % |
| Vent — chimney | 4" | 4" |
| Vent — sidewall | 3" | 4" |
| Boiler water content | 5.5 gal | 6.75 gal |
| Dimensions (W x H x D) | 20¾ × 29 × 23¼ | 24 × 29 × 23¼ |
| Shipping weight | 370 lb | 431 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 150 MBH input with 127 MBH heating capacity and a 109 MBH net AHRI water rating on the SVB-5, against 187.5 MBH, 158 MBH and 135 MBH on the SVB-6; the SVB-5 carries the line's top rating of 84.4% AFUE against 84% on the SVB-6.
Venting and footprint scale with the size: chimney vent is 4" on both, the sidewall vent steps from 3" to 4", and the cabinet grows from 20¾ × 29 × 23¼ in to 24 × 29 × 23¼ in as water content rises from 5.5 to 6.75 gal and weight from 370 to 431 lb. A heat-loss calculation decides between them; installation belongs with a licensed contractor.
Utica Boilers
The Utica SVB-5 is a size in the current SVB Series 4 cast-iron water line: 150 MBH fixed input, 127 MBH heating capacity, a 109 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-6 is a size in the current SVB Series 4 cast-iron water line: 187.5 MBH fixed input, 158 MBH heating capacity, a 135 MBH net AHRI water rating and 84% AFUE, with induced-draft chimney (4") or sidewall (4") venting. It is tagged 'Current' on Utica's Gas Boilers category page.
187.5 MBH input against 150 MBH, 158 MBH heating capacity against 127 MBH, and a 135 MBH net AHRI water rating against 109 MBH, per the official SVB Series 4 sell sheet.
Yes — the induced-draft fan allows chimney or sidewall exhaust: SVB-5 uses 4" chimney and 3" sidewall; SVB-6 uses 4" chimney and 4" 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.