Burnham Alpine ALP105B
The Burnham Alpine ALP105B fires 21 to 105 MBH input at 95.0% AFUE — 96 MBH DOE heating capacity and an 83 MBH net AHRI rating — in the wall-hung or floor-standing Alpine chassis, with the same 3" venting (2" option) as the ALP080B.
Key figures
- Max input
- 105 MBH
- Max CSA output
- —
- AFUE
- 95 %
- Min input
- 21 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Burnham Alpine ALP105B in practice
The ALP105B steps the Alpine line to 21–105 MBH input with 96 MBH DOE heating capacity and an 83 MBH net AHRI water rating at 95.0% AFUE (Table 1-5, Alpine I&O Manual 103448-12). It shares the family's condensing stainless steel coil heat exchanger (ASME Section IV), Sage2.X outdoor-reset control and 5:1 modulation, and runs identical inputs on natural gas and propane.
At 155 lb shipping weight it connects on 1/2" FPT gas and 1" FPT supply/return and is rated 160 psi MAWP with a 30 psi standard relief valve. Venting is 3" CPVC/PVC to 135 ft maximum equivalent intake and vent, with the same reduced 2" option to 60 ft as the 080B. Above 2,000 ft elevation the ratings derate 2.5% per 1,000 ft; a licensed contractor performs installation, gas and venting work against the manual.
Best suited to
- Detached homes whose heat-loss calculation exceeds the ALP080B's 80 MBH ceiling
- Small commercial-adjacent loads still within 105 MBH input
- Projects wanting the 3" vent run (135 ft) with the optional 2" route kept for tight spaces
Applicability and support
- Model number
- ALP105B
- Canadian availability
- unknown
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Series terms
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Specifications
Published specifications
Values as published by Burnham. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input, minimum | 21 MBH | Minimum input at sea level–2,000 ft per Table 1-5 (Alpine I&O Manual 103448-12). Min/max inputs give 5:1 modulation. |
| Input, maximum | 105 MBH | Maximum input at sea level–2,000 ft per Table 1-5. Identical on NG and LP (ships NG, field LP-conversion kit). |
| Output | ||
| DOE heating capacity | 96 MBH | DOE heating capacity at maximum input per Table 1-5. |
| Net AHRI water rating | 83 MBH | Net AHRI water rating per Table 1-5. |
| Efficiency | ||
| Efficiency (AFUE) | 95 % | 95.0% AFUE per the Alpine ratings table (Table 1-5); the product page states 95% AFUE with ENERGY STAR certification. |
| Domestic hot water | ||
| Domestic hot water | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater | |
| Venting and air | ||
| Vent connection | 3" CPVC/PVC (optional 2" reduced-length build) | 3" standard build to 135 ft max equivalent intake and vent; the optional reduced 2" build is limited to 60 ft (Tables 4-2/4-3). |
| Physical and connections | ||
| Shipping weight | 155 lb | Shipping weight per Table 1-5. |
| Gas connection | 1/2" FPT | Female NPT per the Alpine I&O manual specifications. |
| Supply/return connections | 1" FPT | Female NPT per the Alpine I&O manual specifications; condensate connection 3/4" PVC compression socket; relief/drain tapping 3/4" FPT. |
| Operating limits and other | ||
| Fuel | Natural gas or propane | Inputs identical on NG and LP; boiler ships configured for natural gas with a field LP-conversion kit. |
Frequently asked questions
How does the ALP105B compare with the ALP080B?
Input rises from 16–80 to 21–105 MBH, DOE heating capacity from 72 to 96 MBH and net AHRI from 63 to 83 MBH; both are 95.0% AFUE with the same 3"/2" venting options, and the 105B is 18 lb heavier (155 lb shipping).
Does the ALP105B produce domestic hot water?
No. It is heating-only; an indirect tank or separate water heater supplies DHW.
What is the ALP105B's vent limit in 3" pipe?
135 ft maximum equivalent each for intake and vent in the standard 3" CPVC/PVC build; the reduced 2" build is limited to 60 ft.
Questions about the Burnham Alpine ALP105B?
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Compare and explore
Sources and verification
- U.S. Boiler Company — Alpine product page · accessed September 8, 2026
- U.S. Boiler Company — Technical Literature (Alpine/ES2 I&O manual listings) · accessed September 8, 2026
- Alpine High Efficiency Gas Boiler — Installation & Operation Manual, Doc 103448-12 (PDF) · 103448-12 · accessed September 8, 2026
Facts checked September 8, 2026. Last updated September 8, 2026. Technical reviewer: not yet assigned.