Burnham Alta ALTA-150
The Burnham Alta ALTA-150 covers the mid-range of the heating-only Alta line: 20 to 150 MBH input at 95.0% AFUE with 141 MBH heating capacity and a 123 MBH net AHRI rating, in the 20.4 in-deep chassis.
Key figures
- Max input
- 150 MBH
- Max CSA output
- —
- AFUE
- 95 %
- Min input
- 20 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Burnham Alta ALTA-150 in practice
The ALTA-150 steps up to a 20–150 MBH heating input with 141 MBH heating capacity and a 123 MBH net AHRI water rating at 95.0% AFUE, per the official Alta Product Data Sheet ratings table (5/26 print). It is heating-only — an indirect tank or separate water heater handles domestic hot water — on the OneTouch condensing platform with the 316L stainless steel heat exchanger.
The larger chassis shows in the numbers: 103 lb boiler weight and a 20.4 in boiler depth (dimension 'A', shared with the ALTA-180 and ALTAC-200). Venting stays 2" CPVC/PVC or polypropylene, the circulator is the heating-only Grundfos 26-99, and the 50 psi MAWP (ASME 'H') boiler ships with a 30 psi relief valve, set for natural gas with a no-kit LP conversion.
All installation, gas, combustion and venting work belongs with a licensed contractor, sized from a heat-loss calculation. Canadian buyers should confirm supply and CSA/code compliance for the specific model before purchase, since usboiler.net prints no Canadian availability statement.
Best suited to
- Larger homes whose heat-loss calculation lands between 120 and 150 MBH
- Heating-only hydronic systems with higher recovery demand through an indirect tank
- Projects that can accept the deeper 20.4 in chassis for the capacity step
Applicability and support
- Model number
- ALTA-150
- 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 | ||
| Heating input, minimum | 20 MBH | Minimum heating input per the Alta Product Data Sheet ratings table. |
| Heating input, maximum | 150 MBH | Maximum heating input per the Alta Product Data Sheet ratings table. |
| Output | ||
| Heating capacity | 141 MBH | Heating capacity per the Alta Product Data Sheet ratings table. |
| Net AHRI water rating | 123 MBH | Net AHRI water ratings based on a piping and pickup allowance of 1.15, per the PDS ratings table. |
| Efficiency | ||
| Efficiency (AFUE) | 95 % | 95.0% AFUE printed for this model in the Alta Product Data Sheet ratings table. |
| Domestic hot water | ||
| Domestic hot water | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater | A primary/secondary manifold accessory kit (P/N 111884-01) is available for heating-only models; no integrated DHW. |
| Venting and air | ||
| Venting | Direct vent, sealed combustion — 2" universal vent connection (CPVC/PVC or polypropylene) | 2" universal vent connection and 2" air intake per the PDS; horizontal 2-pipe, vertical 2-pipe, concentric and hybrid configurations, plus a polypropylene chimney chase option. |
| Vent size | 2 in | Vent size column of the PDS ratings table prints 2 in for every Alta model. |
| Physical and connections | ||
| Boiler weight | 103 lb | Boiler weight per the Alta Product Data Sheet ratings table. |
| Boiler depth | 20.4 in | Boiler depth dimension 'A' per the PDS ratings and specifications table. |
| Gas connection | 1/2" NPT | 1/2" NPT gas connection as printed on the PDS connection figure. |
| Electrical | ||
| Electrical | 120 VAC connection board | 120 VAC connection board and separate low-voltage connection board per the PDS exploded view. |
| Operating limits and other | ||
| Fuel | Natural gas or propane | Ships set for natural gas; two-step LP conversion at the gas valve switch and display — no kit purchase required, per the Alta Product Data Sheet. |
| Controls | OneTouch system — automatic combustion management, sensor-less rate-based reset, built-in self diagnostics, warm weather shutdown | Automatically sets combustion at start-up and continuously optimizes; outdoor-reset performance without an outdoor sensor. Not a Sage controller (verified in batch8 research). |
| Heat exchanger | 316L stainless steel heat exchanger, corrosion resistant | World-leading 316L stainless steel per the PDS standard-equipment list; 12-year limited warranty per the product page. |
| Minimum gas supply pressure | 2.5 in. w.c. NG / 8.0 in. w.c. LP | Low gas pressure capability as printed on the PDS standard-equipment list. |
| Maximum allowable working pressure (MAWP) | 50 psi | Safety relief valve pressure, water: 30 PSI standard, ASME certified 'H'; maximum allowable working pressure 50 PSI, per the PDS. |
| Safety relief valve | 30 psi | 30 PSI standard per the PDS ratings and specifications notes. |
| Maximum allowable temperature setting | 210 °F | Maximum allowable temperature setting 210°F; target setpoint 180°F; manual reset high limit setpoint 210°F, per the PDS. |
| Altitude rating | 10,100 ft | Altitude capability to 10,100 ft on 'G00' suffix models (installed and set for altitude), per the PDS. |
| Circulator | Grundfos 26-99 | Grundfos 26-99 circulator on heating-only models, per the PDS. |
Alerts documented for this model
None documented yet.
Frequently asked questions
What are the ALTA-150's ratings?
20–150 MBH heating input, 141 MBH heating capacity, a 123 MBH net AHRI water rating and 95.0% AFUE per the Alta Product Data Sheet.
Is the ALTA-150 a combi?
No — heating-only. The same 20–150 MBH input appears on the ALTAC-200, which is the combi that adds integrated DHW.
How deep is the ALTA-150?
20.4 in (dimension 'A'), shared with the ALTA-180 and ALTAC-200; boiler weight is 103 lb.
Questions about the Burnham Alta ALTA-150?
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 — ALTA High Efficiency Condensing Boiler product page · accessed September 9, 2026
- Alta Product Data Sheet — ratings & specifications table (5/26 print, PDF) · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.