Viessmann · Vitogas 100 (GS1 / GS10)
Viessmann Vitogas 100 GS10-96
The Vitogas 100 GS10-96 is the largest commercial GS10 boiler: 380 MBH full-load input (111 kW), 325 MBH output and 85.6% combustion efficiency with nine sections.
Key figures
- Max input
- —
- Max CSA output
- —
- AFUE
- —
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Viessmann Vitogas 100 GS10-96 in practice
The GS10-96 tops the Vitogas 100 commercial range at 380 MBH (111 kW) full-load input and 266 MBH at 70% partial load, with 325 MBH (95 kW) full-load output and a 283 MBH (83 kW) Net I=B=R rating at 85.6% combustion efficiency.
It is the largest GS10 build: nine cast-iron sections, eight burner tubes, 12.8 USG of boiler water and a 1220 mm (48 in) overall width, 1057 mm long and 1088 mm high. The shell weighs 895 lb (406 kg) and the complete boiler 1,194 lb (542 kg), with a nominal 10 in. vent collar and about 125 CFM of combustion and dilution air.
Best suited to
- Existing GS10-96 installations needing printed ratings
- The largest Vitogas 100 commercial loads at 380 MBH full-load input
- Documentation for nine-section GS10 builds
Applicability and support
- Model number
- GS10-96
- 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 Viessmann. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| CSA input, full load | 380 MBH | 111 kW, per the technical data manual |
| CSA input, partial load (70%) | 266 MBH | 78 kW |
| Output | ||
| CSA output, full load | 325 MBH | 95 kW |
| CSA output, partial load (70%) | 228 MBH | 67 kW |
| Net I=B=R rating | 283 MBH | 83 kW; based on piping and pick-up allowance of 1.15. |
| Efficiency | ||
| Combustion efficiency | 85.6 % | Printed for all three GS10 sizes. |
| Venting and air | ||
| Vent pipe collar | 10 in | Nominal diameter per the technical data manual. |
| Physical and connections | ||
| Weight, boiler shell (as delivered incl. burner) | 895 lb | 406 kg |
| Overall weight (with insulation, burner, control, fittings and draft hood) | 1,194 lb | 542 kg |
| Overall length | 1,057 mm | Boiler shell as delivered is 912 mm (36 in). |
| Overall width | 1,220 mm | |
| Overall height | 1,088 mm | 43 in; 1227 mm (48 in) with a Vitotronic control. |
| Operating limits and other | ||
| Fuel | Natural gas or propane | 7 in. w.c. minimum NG supply pressure; 11 in. w.c. for propane. |
| Cast iron sections | 9 | 8 burner tubes. |
| Boiler water content | 12.8 USG | |
| Maximum operating pressure | 60 psig | 4 bar. |
| Boiler supply / return | 2 in. NPTM | Safety supply 1½ in.; gas supply ¾ in. NPTM. |
Manuals
- Technical Data Manual — Vitogas 100 GS1 Series, doc 5167 462 v1.55167 462 v1.5 · 2011-02
- Installation Instructions — Vitogas 100 GS1, rev 1.31.3 · 2011-02
- Technical Data Manual — Vitogas 100 GS10 Series, doc 5167 466 v1.35167 466 v1.3 · 2011-02
- Service Instructions — Vitogas 100 GS10, rev 1.11.1 · 2007-11
Alerts documented for this model
None documented yet.
Frequently asked questions
What is the GS10-96 rated at?
380 MBH (111 kW) full-load input, 266 MBH partial load, 325 MBH (95 kW) full-load output, a 283 MBH Net I=B=R rating and 85.6% combustion efficiency.
How much does the GS10-96 weigh?
The boiler shell ships at 895 lb (406 kg); the complete boiler with insulation, burner, control, fittings and draft hood weighs 1,194 lb (542 kg).
What are the GS10-96 connections?
2 in. NPTM boiler supply and return, 1½ in. safety supply, ¾ in. gas supply and a nominal 10 in. vent pipe collar.
Questions about the Viessmann Vitogas 100 GS10-96?
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
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- Vitogas 100 (GS1 / GS10) series hub
- Buying guide
Sources and verification
- Technical Data Manual — Vitogas 100 GS10 Series, doc 5167 466 v1.3 · 5167 466 v1.3 · accessed September 9, 2026
- Viessmann Canada — Historic manuals · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.