Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
Boilers.ca is a brand of ROMA Heating & Cooling · Licensed gas contractor LGA0202903
Comparison
Verdict in brief
The ALP080B and ALP105B are the two smallest Alpine sizes and share the same 2-inch/3-inch vent allowances, 95.0% AFUE and 32-3/16-inch cabinet height. The 105 adds 25 MBH of input and 24 MBH of DOE heating capacity for about 18 lb more weight and a wider cabinet, so choose by the heat-loss calculation rather than floor area.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | U.S. Boiler Company Alpine ALP080B | U.S. Boiler Company Alpine ALP105B |
|---|---|---|
| Input, minimum | 16 MBH | 21 MBH |
| Input, maximum | 80 MBH | 105 MBH |
| DOE heating capacity | 72 MBH | 96 MBH |
| Net AHRI water rating | 63 MBH | 83 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Vent and intake size | 2" | 2" |
| Approx. shipping weight | 137 lb | 155 lb |
| Dimensions (width × height) | 12-9/16" × 32-3/16" | 14" × 32-3/16" |
| Domestic hot water | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater |
Both boilers are stainless-steel condensing, direct-vent, sealed-combustion appliances on the Sage2.3 touch-screen control with outdoor reset, DHW priority and warm-weather shutdown. Their rating rows both print 95.0% AFUE, with the ALP080B at 16–80 MBH input and 72 MBH DOE heating capacity against the ALP105B's 21–105 MBH input and 96 MBH capacity.
Venting is identical in structure: either size may use 2-inch intake/vent to 60 feet per side or 3-inch to 135 feet per side, so a long vent route does not force the larger model. The practical differences are capacity and dimensions — the ALP080B is 12-9/16 inches wide and 137 lb, the ALP105B 14 inches wide and 155 lb, both in the same 32-3/16-inch-high wall-or-floor cabinet.
In a low-load home the 080B's 16 MBH minimum fire tracks mild-weather demand more closely; the 105B is the better fit when the calculated heat loss plus any indirect-tank recovery exceeds what the 080B delivers on a design day.
U.S. Boiler Company
The U.S. Boiler Company Alpine ALP080B fires 16–80 MBH input with 72 MBH DOE heating capacity and a 63 MBH net AHRI water rating at 95% AFUE — the smallest Alpine size and the low-load entry point for the condensing line — on the stainless-steel condensing platform with the Sage2.3 touch-screen control.
U.S. Boiler Company
The U.S. Boiler Company Alpine ALP105B fires 21–105 MBH input with 96 MBH DOE heating capacity and a 83 MBH net AHRI water rating at 95% AFUE — the second size, sharing the compact 32-3/16-inch cabinet with the ALP080B — on the stainless-steel condensing platform with the Sage2.3 touch-screen control.
Yes — the data sheet lists 2-inch intake/vent to 60 feet per side or 3-inch to 135 feet per side for both the ALP080B and ALP105B.
Yes — the Product Data Sheet lists the 80 through 210 sizes for wall or floor mounting with a pre-installed hanging bracket and wall-mount kit included.
That depends on a room-by-room heat-loss calculation, not floor area. The 080B suits lower loads; the 105B exists for loads above what the 080B delivers at design conditions.
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.