Weil-McLain AquaBalance AB-80H
The AB-80H is the heat-only entry of the discontinued-in-Canada AquaBalance Series 2 line: 80 MBH CSA input, 75 MBH DOE heating capacity and a 65 MBH net AHRI rating at 95% AFUE in a 64 lb stainless steel wall-mount unit.
Key figures
- Max input
- 80 MBH
- Max CSA output
- 75 MBH
- AFUE
- 95 %
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Weil-McLain AquaBalance AB-80H in practice
The AB-80H is the smallest heat-only AquaBalance Series 2: 80 MBH CSA input for 75 MBH of DOE heating capacity and a 65 MBH net AHRI rating at 95% AFUE, weighing 64 lb as the lightest model of the line. It is a Category IV condensing boiler on Weil-McLain's stainless steel platform — the US page describes a 1" diameter ASME-certified 316L stainless steel single-tube heat exchanger, ENERGY STAR certification and SCAQMD-compliant low-NOx firing with a digital Honeywell control and 3-in-1 vent adapter.
Weil-McLain Canada lists the AquaBalance under Discontinued in two entries — combi and heat-only — each with 80/120/155 MBH inputs, up to 95% AFUE, 10:1 modulation and Cat. 4 venting per S636 in PVC, CPVC, polypropylene or stainless steel. As a heat-only model, the AB-80H is documented by the CA page for space heating with domestic hot water from an indirect tank, and Boilers.ca flags the CA page's 73 MBH output figure against the 75 MBH DOE heating capacity of the US Series 2 documents.
Best suited to
- Homes with heat loads near 80 MBH that keep hot water on a separate indirect tank
- Limited-space and retrofit installations the discontinued CA page lists for the AquaBalance
- Buyers comparing the heat-only and combi AquaBalance variants of the Series 2 generation
Applicability and support
- Model number
- AB-80H
- Canadian availability
- historical
- Production status
- discontinued
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Not verified
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 Weil-McLain. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input, maximum | 80 MBH | CSA input (maximum). |
| Output | ||
| DOE heating capacity | 75 MBH | US Series 2 DOE heating capacity; the CA discontinued page prints 73 MBH output for this size (see the editor note). |
| Net AHRI water rating | 65 MBH | Net AHRI water rating per the US Series 2 product page table. |
| Efficiency | ||
| Efficiency (AFUE) | 95 % | 95% AFUE per the US Series 2 page; the CA discontinued page lists up to 95%. |
| Domestic hot water | ||
| Domestic hot water | Heating-only boiler; domestic hot water via an indirect tank | Per the CA discontinued "AquaBalance (Heat Only)" page, which lists its ideal use as space heating and domestic hot water with an indirect tank required. |
| Venting and air | ||
| Venting | 2" or 3" PVC, CPVC, polypropylene or stainless steel (Category IV) | Canada: install per CAN/CSA B149.1 or B149.2 with a ULC S636-compliant vent kit. |
| Physical and connections | ||
| Weight | 64 lb | Approx. shipping weight per the US Series 2 product page. |
| Gas connection | 1/2" NPT | Gas connection per the Series 2 brochure connection chart. |
| Heating water connections | 3/4" NPT | Heating supply and return 3/4" NPT on the 80/120 sizes and 1" NPT on the 155, per the Series 2 brochure connection chart. |
| Operating limits and other | ||
| Turndown | 10:1 | 10:1 modulation per the notes on both CA discontinued AquaBalance pages. |
| Fuel | Natural gas or propane | Propane requires a conversion kit per the CA product page. |
Manuals
- AquaBalance Series 2 Boiler Manual, 550-100-325/0924550-100-325/0924 · 2024-09
Alerts documented for this model
Frequently asked questions
What are the AB-80H's ratings?
80 MBH CSA input, 75 MBH DOE heating capacity, a 65 MBH net AHRI rating and 95% AFUE, at a 64 lb shipping weight per the US Series 2 product page.
Why does the CA page list 73 MBH where the US page lists 75 MBH?
The CA discontinued AquaBalance page prints outputs of 73/109/143 MBH for the 80/120/155, while the US Series 2 page and manual print DOE heating capacities of 75/112/144 MBH. Boilers.ca treats the Series 2 figures as the ratings for this generation.
Does the AB-80H produce domestic hot water?
No. The AB-80H is a heat-only model; the CA discontinued page says domestic hot water comes from an indirect tank, which is why the combi AB-80C exists for on-demand DHW.
Questions about the Weil-McLain AquaBalance AB-80H?
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
- Weil-McLain AquaBalance AB-80C vs AB-80HComparison
- Weil-McLain AquaBalance AB-80H vs AB-120CComparison
- Weil-McLain AquaBalance AB-80CSame series
- Weil-McLain AquaBalance AB-120CSame series
- Weil-McLain AquaBalance AB-155CSame series
- Weil-McLain AquaBalance AB-120HSame series
- Weil-McLain AquaBalance AB-155HSame series
- AquaBalance series hub
- Buying guide
Sources and verification
- Weil-McLain Canada — AquaBalance (Heat Only), discontinued · accessed September 8, 2026
- AquaBalance Series 2 Boiler Manual 550-100-325/0924 · 550-100-325/0924 · accessed September 8, 2026
Facts checked September 8, 2026. Last updated September 8, 2026. Technical reviewer: not yet assigned.