Weil-McLain GV90+6
The GV90+6 is the largest GV90+ at 175 MBH input and 161 MBH DOE heating capacity — 91.0% AFUE in the 37-3/4" cabinet with 6.9 gallons of boiler water.
Key figures
- Max input
- 175 MBH
- Max CSA output
- 161 MBH
- AFUE
- 91 %
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Weil-McLain GV90+6 in practice
The GV90+6 tops the cast iron GV90+ range at 175 MBH CSA input for 161 MBH of DOE heating capacity and a 140 MBH net AHRI rating at 91.0% AFUE. It holds 6.9 gallons of boiler water in the 37-3/4" cabinet and ships at 464 lb, the heaviest GV90+.
Like the rest of Series 2 it is a Category IV boiler vented in 3" pipe to 100 ft, with 1" NPT supply and return connections, a 1/2" NPT gas connection, the built-in low water cut-off and indicator-light diagnostics. It is heating-only and is matched with an indirect-fired water heater for domestic hot water.
Best suited to
- The largest residential and light-commercial cast iron loads near 175 MBH
- High-temperature systems where GV90+'s wide waterways and cast iron sections matter
- Projects that can handle a 464 lb floor-standing boiler
Applicability and support
- Model number
- GV90+6
- Canadian availability
- available
- 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 Weil-McLain. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input, maximum | 175 MBH | CSA input (maximum). |
| Output | ||
| DOE heating capacity | 161 MBH | DOE heating capacity at maximum input; the manuals also call this CSA Output. |
| Net AHRI water rating | 140 MBH | Net AHRI rating per the boiler manual ratings table. |
| Efficiency | ||
| Efficiency (AFUE) | 91 % | 91.0% AFUE. |
| Domestic hot water | ||
| Domestic hot water | Heating-only boiler; domestic hot water via an indirect tank or separate appliance | |
| Venting and air | ||
| Venting | 3" PVC, CPVC, polypropylene or stainless steel (Category IV); 3" pipe on all GV90+ sizes | Canada: install per CAN/CSA B149.1 or B149.2 with a ULC S636-compliant vent kit. |
| Max. equivalent vent/air length | 100 ft (vent and air each) | |
| Physical and connections | ||
| Weight | 464 lb | Approx. shipping weight per the boiler manual and brochure. |
| Cabinet length | 37-3/4" | |
| Gas connection | 1/2" NPT | |
| Heating water connections | 1" NPT supply (male) and 1" NPT return (female) | Minimum recommended pipe 1-1/4". |
| Operating limits and other | ||
| Boiler water content | 6.9 gal | |
| Fuel | Natural gas or propane | Propane requires a conversion kit per the CA product page. |
Manuals
- GV90+ Series 2 Boiler Manual, 550-143-010/0324550-143-010/0324 · 2024-03
Alerts documented for this model
- POWER LED flashes once per second
- POWER LED 2 flashes
- POWER LED 3 flashes
- POWER LED 4 flashes
- POWER LED 5 flashes
- POWER LED 6 flashes
- POWER light flashing alone
- POWER and TSTAT/CIRC lights flashing
- POWER and PRESS SWITCH lights flashing
- POWER and FLAME lights flashing
- FLAME lights flashing
- Solid LWCO light
- LWCO light flashing alone
- TSTAT/CIRC light flashing alone
- LIMIT light flashing alone
- POWER and LIMIT lights flashing
Frequently asked questions
What are the GV90+6's ratings?
175 MBH input, 161 MBH DOE heating capacity, 140 MBH net AHRI and 91.0% AFUE.
How much water does the GV90+6 hold?
6.9 gallons of boiler water — the most in the GV90+ line — with a 464 lb shipping weight.
Is the GV90+6 efficient enough to qualify for rebates?
The brochure says the GV90+ exceeds ENERGY STAR requirements at 91% efficiency and is eligible for most utility rebate programs; eligibility is confirmed locally.
Questions about the Weil-McLain GV90+6?
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
- Weil-McLain Canada — GV90+ · accessed September 7, 2026
- GV90+ Series 2 Boiler Manual 550-143-010/0324 · 550-143-010/0324 · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.