Burnham Alta Combi ALTAC-136B
The Burnham Alta Combi ALTAC-136B is the entry combi Alta: 13.6–120 MBH heating input with DHW input to 136 MBH, 3.7 GPM at a 70°F rise, 113 MBH heating capacity and a 98 MBH net AHRI rating at 95.0% AFUE.
Key figures
- Max input
- 120 MBH
- Max CSA output
- —
- AFUE
- 95 %
- Min input
- 13.6 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Burnham Alta Combi ALTAC-136B in practice
The ALTAC-136B is the smaller of the two Alta combis, integrating the DHW hydro block (flat plate heat exchanger, boiler circulator and 3-way valve) in the compact 16.3 in-deep chassis. The official Alta Product Data Sheet prints 95.0% AFUE, 13.6–120 MBH heating input for 113 MBH heating capacity and a 98 MBH net AHRI water rating, plus a 13.6–136 MBH DHW input delivering 3.7 GPM at a 70°F rise and 3.4 GPM at 77°F.
The combi package includes the Alta FastPipe primary/secondary header with 1-1/4" supply/return connections (with temperature/pressure gauge), a Grundfos UPS-78 Special circulator, and the OneTouch control that adapts fuel settings automatically — the product page describes the Alta combi as gas-adaptive with virtually instantaneous DHW response, economy or comfort/recirculation modes, and high DHW turndown. Weight is 95 lb.
Domestic hot water and space heating come from one appliance, but input must be shared between the two duties — sizing both the heating load and DHW demand against the 120 MBH heating ceiling is contractor work.
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
- Homes wanting space heating and domestic hot water from a single 16.3 in-deep wall-hung condensing appliance
- Projects where the DHW rates (3.7 GPM at 70°F rise) match family demand without a separate tank
- Compact mechanical rooms — the lightest combi Alta at 95 lb
Applicability and support
- Model number
- ALTAC-136B
- 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 | 13.6 MBH | Minimum heating input per the Alta Product Data Sheet ratings table. |
| Heating input, maximum | 120 MBH | Maximum heating input per the Alta Product Data Sheet ratings table. |
| DHW input, minimum | 13.6 MBH | Minimum DHW input per the PDS ratings table. |
| DHW input, maximum | 136 MBH | Maximum DHW input per the PDS ratings table. |
| Output | ||
| Heating capacity | 113 MBH | Heating capacity per the Alta Product Data Sheet ratings table. |
| Net AHRI water rating | 98 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 | ||
| DHW rate at 70°F rise | 3.7 GPM | DHW rate at a 70°F temperature rise per the PDS ratings table. |
| DHW rate at 77°F rise | 3.4 GPM | DHW rate at a 77°F temperature rise per the PDS ratings table. |
| Domestic hot water | Combi — integrated DHW hydro block with flat plate heat exchanger, boiler circulator and 3-way valve | Integrated hydro block system with quick-disconnect components; Alta FastPipe primary/secondary header included on combi models with 1-1/4" supply/return connections. |
| 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 | 95 lb | Boiler weight per the Alta Product Data Sheet ratings table. |
| Boiler depth | 16.3 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. |
| Water connections | Alta FastPipe header with 1-1/4" supply/return connections | AltaFastPipe (primary/secondary header) included with Alta combi boilers, with a temperature/pressure gauge and 1-1/4" supply/return connections per the PDS. |
| 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 UPS-78 Special | Grundfos UPS-78 Special circulator on combi models, per the PDS. |
Alerts documented for this model
None documented yet.
Frequently asked questions
What are the ALTAC-136B's ratings?
95.0% AFUE; 13.6–120 MBH heating input; 113 MBH heating capacity; 98 MBH net AHRI; 13.6–136 MBH DHW input at 3.7 GPM (70°F rise) / 3.4 GPM (77°F rise), per the Alta Product Data Sheet.
Is the ALTAC-136B a combi boiler?
Yes — it integrates a DHW hydro block with flat plate heat exchanger, boiler circulator, 3-way valve and instantaneous DHW flow sensor, with the Alta FastPipe header included.
What circulator does the ALTAC-136B use?
A Grundfos UPS-78 Special (combi models), per the PDS — the heating-only models use the Grundfos 26-99.
Questions about the Burnham Alta Combi ALTAC-136B?
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.
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.